JP5186401B2 - CONTROL SYSTEM AND TERMINAL DEVICE USED FOR THE CONTROL SYSTEM - Google Patents

Description

  The present invention relates to a control system in which signals are transmitted and received between a terminal device and a transmission control device by a time division multiplex transmission method, and more particularly to a control system for driving and controlling a load device such as a lighting device.

  Conventionally, in a control system for controlling a plurality of load devices such as lighting devices, as a method of transmitting a control signal to a terminal device that drives the load device, time division multiplexing in which a control signal is superimposed on a power supply voltage supplied to each terminal device A transmission method is adopted. In the control system based on this time division multiplex transmission method, a transmission control device serving as a parent device that transmits a control signal to a terminal device that drives a load device is installed. Then, a power supply line serving as a signal line is connected between the transmission control device and the terminal device, and the transmission control device centrally manages transmission of control signals to the terminal device based on addresses assigned to the terminal device. .

  There is also provided a control system that performs time schedule control for controlling driving of a predetermined load device at a predetermined time (see Patent Document 1 and Patent Document 2). In Patent Document 1, a monitoring device used in a control system for building automation or home automation, a radio clock is attached to a monitoring device with a built-in clock, and the time of the built-in clock is corrected at the standard time received by the radio clock. Possible monitoring devices have been proposed.

  And in patent document 2, the control system by the time division multiplex transmission system which implement | achieved time schedule control by having a transmission control apparatus provided with a timepiece part is proposed. Further, as one of the control systems proposed in Patent Document 2, a control system is proposed in which a time setting terminal for setting a time measured by a clock unit in a transmission control device is installed. This time setting terminal creates time setting data based on the time of a connected external clock or directly input time. When the transmission control device receives the time setting data set by the time setting terminal, the transmission control device corrects the current time measured by the clock unit.

  As described above, in the conventional control system, in order to perform time schedule control by measuring an accurate time, the transmission control device including the clock unit is set to the standard time as in the monitoring device disclosed in Patent Document 1. It is desirable to add a reception function for time information. Also, like the control system shown in Patent Document 2, the current time measured by the transmission control device can be corrected to an accurate time by installing a time setting terminal in the control system. Based on time schedule control can be realized.

Japanese Patent Laid-Open No. 11-183670 JP 2007-306415 A

  However, when a transmission control device having the same configuration as the monitoring device according to Patent Document 1 is used in a control system, it is necessary to newly incorporate a reception unit in the transmission control device in order to receive time information. Therefore, in a control system using a transmission control device that does not have a receiving unit, it is necessary to replace the existing transmission control device with a new transmission control device that has a receiving unit, and the control system is complicated to update. It becomes.

  On the other hand, when the time setting terminal is employed as in the control system of Patent Document 2, the control system can be easily updated by additionally installing the time setting terminal. However, in this patent document 2, the time setting terminal has only a function of transmitting time information input directly or externally. Therefore, when the time information input directly or from the outside is not accurate, there is a problem that the time counted in the control system is not accurate.

  In view of such a problem, an object of the present invention is to provide a control system that can receive a signal from a global positioning system satellite, acquire time information, and supply an accurate current time in the system. .

In order to achieve the above object, a control system according to the present invention includes a load device, a load terminal device for driving and controlling the load device, and a signal line connected between the load terminal device. In a control system comprising a transmission control device that transmits a control signal to a terminal device by a time division multiplex transmission method,
A receiving terminal device that receives a positioning signal from a global positioning system satellite and calculates the current time from time information included in the positioning signal, and serially transfers a signal by the time division multiplex transmission method from the transmission control device A signal conversion terminal device for converting the signal into a signal according to a method , wherein the receiving terminal device has a mounting frame provided on the back surface, an operation unit and a display unit provided on the surface of the main body, and a waterproof cover on the surface of the main body Is connected to the transmission control device by the signal line, and transmits a time signal based on the current time to the transmission control device through the signal line , and the signal conversion terminal device has the transmission control When receiving the time signal further transmitted by the transmission control device, which is connected to the device by the signal line and receives the time signal from the receiving terminal device, Characterized in that it converts the time signal signal to a time signal by the serial transfer method.

  In such a control system, it further comprises a clock terminal device that counts the current time, and the clock terminal device is connected to the transmission control device by the signal line and receives a time signal from the receiving terminal device. When the transmission control device further receives the time signal transmitted, time correction may be performed based on the received time signal. At this time, the timepiece terminal device may be a program timer device that generates a control signal for time schedule control of the load terminal device and transmits the control signal to the transmission control device.

  The pulse transmission terminal device further generates a pulse signal for time correction. The pulse transmission terminal device is connected to the transmission control device by the signal line and receives a time signal from the reception terminal device. When the transmission control device receives the time signal further transmitted, the pulse generation period in the time correction pulse signal may be corrected by the received time signal.

  At this time, a clock terminal device that receives a pulse signal from the pulse transmission terminal device and measures the current time in synchronization with the pulse signal may be further provided. The timepiece terminal device may be a program timer device that generates a control signal for time schedule control of the load terminal device and transmits the control signal to the transmission control device.

The terminal device of the present invention includes a transmission control device that transmits a control signal by a time division multiplex transmission method, a mounting frame provided on the back surface, and an operation unit and a display unit provided on the surface of the main body. A waterproof structure covered with a waterproof cover, connected to a signal line connected to the transmission control device, a communication unit that transmits and receives signals in a time division multiplex transmission system, a clock unit that measures the current time, and a global A positioning signal receiving unit that receives a positioning signal from a positioning system satellite; and a time correcting unit that corrects a current time measured by the clock unit from time information acquired from the positioning signal receiving unit. The positioning signal receiving unit receives a positioning signal from the global positioning system satellite, corrects the current time measured by the clock unit by the time adjustment unit, and generates a time signal based on the corrected current time. Communication department A terminal apparatus used in a control system and a receiving terminal apparatus to be transmitted to the transmission control device, which is connected with the transmission control device and the signal line connected, to transmit and receive signals by time division multiplex transmission method A communication unit, a signal conversion unit for converting a signal by a time division multiplex transmission method received by the communication unit into a signal by a serial transfer method, and a signal output unit for outputting a signal by a serial transfer method generated by the signal conversion unit When the communication unit receives the time signal further transmitted by the transmission control device that has received the time signal from the receiving terminal device, the signal conversion unit serially transfers the received time signal. It converts into the time signal by a system, It is characterized by the above-mentioned .

  According to the present invention, the receiving terminal device receives the positioning signal from the global positioning system satellite, and transmits the time information based on the current time calculated from the time information included in the positioning signal by the time division multiplex transmission method. it can. Therefore, accurate time information can be provided to the system by incorporating this receiving terminal device in a system that employs the time division multiplex transmission method. Thereby, since the time in the system is corrected by the accurate time information supplied from the receiving terminal device, the time schedule control based on the accurate time can be realized in the system in which the time schedule control is performed. In addition, since it is possible to obtain a system that can acquire accurate time information only by incorporating a receiving terminal device, it is possible to easily update an existing system.

These are block diagrams which show the internal structure of the receiving terminal device of this invention. FIG. 2 is an exploded perspective view showing the configuration of the receiving terminal device shown in FIG. 1. FIG. 2 is an external view showing a configuration of a back surface side of the receiving terminal device shown in FIG. 1. These are the figures for demonstrating the 1st example of the transmission operation of the time signal by the receiving terminal device shown in FIG. These are the figures for demonstrating the 2nd example of the transmission operation of the time signal by the receiving terminal device shown in FIG. These are the figures for demonstrating the 3rd example of the transmission operation of the time signal by the receiving terminal device shown in FIG. These are the figures for demonstrating the 4th example of the transmission operation of the time signal by the receiving terminal device shown in FIG. These are block diagrams which show the structure of the control system used as the 1st Embodiment of this invention. These are block diagrams which show the internal structure of a transmission control apparatus. These are block diagrams which show the internal structure of a program timer apparatus. These are block diagrams which show the internal structure of the terminal device for input. These are block diagrams which show the internal structure of the terminal device for load. FIG. 9 is a diagram for explaining an example of signal transmission / reception in the control system of FIG. 8. These are block diagrams which show the structure of the control system used as the 2nd Embodiment of this invention. These are block diagrams which show the internal structure of a pulse transmission terminal device. These are the figures for demonstrating an example of transmission / reception of the signal in the control system of FIG. These are block diagrams which show the structure of the control system used as the 3rd Embodiment of this invention. These are block diagrams which show the internal structure of a signal conversion terminal device.

<Configuration of receiving terminal device>
The configuration of the receiving terminal apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an internal configuration of a receiving terminal apparatus according to the present invention. 2 is an exploded perspective view showing the configuration of the receiving terminal apparatus shown in FIG. 3 is an external view showing the configuration of the back side of the receiving terminal device shown in FIG.

  The receiving terminal device 1 shown in FIG. 1 transmits and receives signals between a power supply unit 11 that is connected to a two-wire signal line Ls and obtains power, and a transmission control device 2 that is connected to the signal line Ls and described later. A communication unit 12 that performs a measurement, a clock unit 13 that measures a current time including a crystal oscillator, a GPS antenna 14 that receives a positioning signal from a Global Positioning System (GPS) satellite, and a GPS antenna 14 In order to execute the operations of the GPS receiving unit 15 that obtains position information and time information from the positioning signal received in Step 1, the address setting unit 16 that stores the address set in the receiving terminal device 1, and the receiving terminal device 1 The signal processing unit 17 for performing the signal processing, the operation button 18 for receiving a positioning signal reception command from a GPS satellite, and the energization display LE indicating that the receiving terminal device 1 is energized D (Light Emitting Diode) 19a and a reception completion LED 19b indicating that the receiving terminal device 1 has received a positioning signal from a GPS satellite and has completed acquisition of time information.

  In the reception terminal device 1 configured as described above, the power supply unit 11 obtains a DC power supply by full-wave rectifying the bipolar (± 24V) time division multiplexed signal supplied to the signal line Ls. The DC power acquired by the power supply unit 11 is supplied to each of the communication unit 12, the clock unit 13, the GPS reception unit 15, the address setting unit 16, and the signal processing unit 17. Further, each of the energization display LED 19 a and the reception completion LED 19 b is electrically connected to the signal processing unit 17, so that power is supplied from the power supply unit 11 via the signal processing unit 17.

  The communication unit 12 connected to the signal line Ls and communicating with the transmission control device 2 extracts the time division multiplexed signal transmitted from the transmission control device 2 through the signal line Ls, and time division multiplexed to the transmission control device 2. The signal is transmitted while being superimposed on the power supply voltage of the signal line Ls. The time division multiplexed signal transmitted by the transmission control device 2 includes control data for operating terminal devices such as the receiving terminal device 1 is referred to as “control signal” in this specification. Also, a time division multiplexed signal including time information transmitted from the receiving terminal apparatus 1 to the transmission control apparatus 2 and a time division multiplexed signal including time information transmitted from the transmission control apparatus 2 to a terminal apparatus other than the receiving terminal apparatus 1 are provided. In the present specification, it is referred to as a “time signal”.

  The clock unit 13 measures the current time by an oscillation signal from a built-in crystal oscillator, and includes an RTC (Real Time Clock) that generates a clock signal by a pulse based on the oscillation signal from the crystal oscillator. Then, the clock unit 13 counts the clock signal from the RTC to measure the current time. In such a timepiece unit 13, it is preferable that the error per month is within ± 15 seconds. The address setting unit 16 holds a unique address set for the receiving terminal device 1 and can be an EEPROM (Electrically Erasable Programmable Read Only Memory) that can be set from the outside using an optical wireless signal or the like. It consists of dip switches that can be set by user operation.

  The GPS receiver 15 receives a high-frequency signal, which is a positioning signal from a GPS satellite, through the GPS antenna 14, performs demodulation and decoding on the received high-frequency signal using a spread spectrum encoding method, and uses the C / A (Course Acquisition) code is acquired. At this time, the C / A code acquired from the received positioning signal and the time information counted by the clock unit 13 are synchronized. Then, using the time information synchronized with the C / A code, the ephemeris information and the almanac information in the C / A code, the time information indicating the correct current time, and the position indicating the latitude and longitude of the receiving terminal device 1 Get information and. The position information and time information acquired by the GPS receiving unit 15 are respectively given to the signal processing unit 17, and at the same time, time information is given to the clock unit 13, and the current time measured by the clock unit 13 is the GPS receiving unit 15. The time is converted into the time based on the time information acquired in step (1).

  When the signal processing unit 17 receives the control signal received by the communication unit 12, the signal processing unit 17 performs signal processing on the control signal, compares the address based on the address data included in the control signal with the address stored in the address setting unit 16, and Check if it is a control signal to the device itself. Further, when receiving the positioning signal is requested by the control data included in the control signal or when the operation button 18 is operated, the signal processing unit 17 controls the operation of the GPS receiving unit 15 to determine the position. The information and time information are acquired, and the current time measured by the clock unit 13 is updated to an accurate time. Further, when the time signal is transmitted from the communication unit 12 to the transmission control device 2, the signal processing unit 17 uses either the time information acquired by the GPS receiving unit 15 or the time information based on the current time measured by the clock unit 13. The time signal is generated and given to the communication unit 12.

  When power is supplied from the signal line Ls to the power supply unit 11, the signal processing unit 17 supplies power to the energization display LED 19a, and blinks or lights the energization display LED 19a. In addition, when the time information and the position information are acquired by the GPS receiver 15, power is supplied to the reception completion LED 19b to indicate that the positioning signal reception operation from the GPS satellite is completed, and the reception is completed for a predetermined time. The LED 19b is blinked or turned on. Further, the position information acquired once by the GPS receiving unit 15 is stored in the signal processing unit 17 or the GPS receiving unit 15, and the stored position information is used when the GPS receiving unit 15 next receives a positioning signal. The time information may be acquired.

(Initial setting)
The reception terminal device 1 configured as described above is installed on an outdoor wall or the like for receiving a positioning signal from a GPS satellite, and is connected to a signal line Ls connected to a transmission control device 2 installed indoors. The At this time, as shown in FIG. 2, the back side of the terminal device body 100 including the blocks shown in FIG. 1 is attached to the outer wall surface 103 via the insulating attachment frame 102. Further, the surface side of the terminal device main body 100 is covered with a cover 101 for the purpose of waterproofing against rainwater. Further, the terminal device main body 100 has an operation button 18, an energization display LED 19a, and a reception completion LED 19b arranged on the front surface thereof, and a signal for connecting to the signal line Ls on the back surface thereof as shown in FIG. A terminal block 104 is provided.

  When the receiving terminal device 1 is connected to the signal terminal block 104 and installed on the outer wall surface 103, power is supplied to the power supply unit 11 through the signal line Ls. Or blink. Thereafter, when the operation button 18 is operated or a control signal from the transmission control device 2 is received, the receiving terminal device 1 is initialized. When the initial setting of the receiving terminal device 1 is completed, the cover 101 is installed so as to cover the terminal device main body 100, and the installation of the receiving terminal device 1 is completed.

  The initial setting of the receiving terminal device 1 will be described below. In the receiving terminal device 1, when the power supply from the power supply unit 11 is started, the signal processing unit 17 starts driving the clock unit 13. Thereafter, initial setting is started by first receiving an operation on the operation button 18 or by first receiving a control signal from the transmission control device 2 by the communication unit 12. In this initial setting, the reception operation by the GPS receiving unit 15 is started, and the acquisition of position information by latitude and longitude on the earth of the receiving terminal device 1 and the initialization of the current time measured by the clock unit 13 are executed. The

  At this time, the signal processing unit 17 gives a command to the GPS receiving unit 15 to receive positioning signals from four or more GPS satellites in order to acquire accurate position information and time information. Therefore, the GPS receiving unit 15 uses the positioning signals received from four or more GPS satellites and the time information timed by the clock unit 13, and the time information indicating the correct current time, and the receiving terminal device 1 The position information indicating the latitude and longitude of the current position is acquired and sent to the signal processing unit 17. The signal processing unit 17 gives the time information to the clock unit 13 to change the time counted by the clock unit 13 to the current time based on the time information. Further, the clock unit 13 synchronizes the clock signal generated from the built-in RTC with the C / A code by the positioning signal from the GPS satellite, and simultaneously initializes the clock signal for measuring the time. Further, the signal processing unit 17 stores the position information given from the GPS receiving unit 15.

  As described above, when the GPS receiving unit 15 receives positioning signals from four or more GPS satellites and completes the acquisition of time information and position information, the signal processing unit 17 lights or blinks the reception completion LED 19b. . Therefore, the worker who is performing the installation work of the reception terminal device 1 can confirm that the time setting and the position information are normally received and the initial setting is completed by turning on or blinking the reception completion LED 19b. Thereafter, as described above, the worker installs the cover 101 on the terminal device body 100 in order to complete the installation of the receiving terminal device 1 for which the initial setting has been completed.

(Time information acquisition operation)
As described above, the receiving terminal device 1 acquires the time information by receiving the positioning signal from the GPS satellite periodically, for example, once a day after acquiring the position information by the initial setting. And the current time measured by the clock unit 13 is updated. At this time, the signal processing unit 17 may start the time information acquisition operation by confirming that the time counted by the time unit 13 has reached a predetermined time, or may periodically start from the transmission control device 2. The time information acquisition operation may be started by transmitting a control signal to the receiving terminal device 1. Alternatively, the time information acquisition operation may be artificially started by the operator operating the operation switch 18.

  When the signal processing unit 17 accepts the start of the time information acquisition operation, the signal processing unit 17 instructs the GPS receiving unit 15 to receive a positioning signal from one or more GPS satellites. Simultaneously with this command, the signal processing unit 17 reads out the position information acquired and stored at the time of initial setting, and gives it to the GPS receiving unit 15. Therefore, the GPS receiving unit 15 obtains an accurate current time from a positioning signal from one or more GPS satellites, position information given from the signal processing unit 17, and time information based on the current time measured by the clock unit 13. Time information to be represented is acquired and sent to the signal processing unit 17. The signal processing unit 17 gives the time information to the clock unit 13 to change the time counted by the clock unit 13 to the current time based on the time information. As in the initial setting, the clock unit 13 also initializes the clock signal generated from the built-in RTC at the same time as updating the current time.

  When performing the time information acquisition operation, the GPS receiving unit 15 may receive positioning signals from four or more GPS satellites and acquire position information and time information anew, as in the initial setting. That is, when receiving positioning signals from four or more GPS satellites, the GPS receiving unit 15 can newly acquire position information and time information without receiving position information from the signal processing unit 17. The signal processing unit 17 may update and store the newly acquired position information when the acquired position information is different from the already stored position information.

(Time division multiplex transmission method)
The time division multiplexed signal transmitted / received by the time division multiplexing transmission system using the signal line Ls will be briefly described. The transmission control device 2 transmits a time division multiplexed signal including a control signal and a time signal. The time-division multiplexed signal transmitted from the transmission control device 2 includes a synchronization pulse, mode data indicating a signal mode, address data indicating an address (8 bits) of a terminal device to be transmitted (accessed), and control. It consists of control data indicating the contents, checksum data for detecting a transmission error, and a signal return period which is a time slot for returning a reply signal from the terminal device. Each data is formed by pulse width modulation. Is done.

  The time division multiplex signal transmitted from the transmission control device 2 functions as constant polling transmitted at regular intervals. When a time division multiplexed signal is transmitted to a terminal device serving as a communication partner like a control signal and a time signal, control data based on control contents and time information is incorporated into the time division multiplexed signal together with address data. When the transmission control device 2 does not need to transmit the control signal and the time signal, the transmission control device 2 uses the dummy mode indicating the interrupt permission and the synchronization pulse to accept the interrupt from the terminal device. The configured time division multiplexed signal is transmitted as a dummy signal.

  On the other hand, when the terminal device interrupts, when receiving a dummy signal from the transmission control device 2, the terminal device indicates that the own device performs an interrupt in order to respond synchronously to the synchronization pulse of the dummy signal. An interrupt signal is generated, and this interrupt signal is returned to the transmission control device 2. At this time, since the transmission control device 2 that has received the interrupt signal recognizes that there is an interrupt from the terminal device, when transmitting the next time division multiplexed signal following the dummy signal to which the interrupt signal is synchronized, An interrupt polling signal in which the mode data is set to the interrupt polling mode is transmitted. This interrupt polling signal is repeatedly transmitted by increasing the upper bits of the address data in order until there is a reply from the terminal device that transmitted the interrupt signal.

  After that, when the terminal device that requested the interrupt receives the interrupt polling signal having the address data that matches the upper bit of the address, the lower bit of the address of the own device is replaced with the signal return period of the interrupt polling signal. Is sent back to the transmission control device 2 as monitoring data. When the transmission control device 2 receives the monitoring data, the transmission control device 2 acquires the address of the terminal device that requested the interruption from each of the address data of the interruption polling signal and the monitoring data. Therefore, the transmission control device 2 generates a control signal based on the address data based on the acquired address, transmits the mode data as the monitoring mode, and then returns from the terminal device that requested the interrupt. Receive data.

  And the transmission control apparatus 2 recognizes the content of the information transmitted from a terminal device by processing the monitoring data from a terminal device. For example, when the terminal device that requested the interruption is the receiving terminal device 1 and transmits time information and position information by interruption, when the receiving terminal device 1 receives the control signal in the monitoring mode, the control signal In the signal return period, monitoring data based on time information and position information is returned to the transmission control device 2 as a time signal. Thereby, the transmission control apparatus 2 can receive the time information and the position information acquired by the receiving terminal apparatus 1 by the interruption operation of the receiving terminal apparatus 1.

1. First Example of Time Signal Transmission Operation for Correcting Current Time A first example of time signal transmission operation in the receiving terminal device 1 will be described below with reference to FIG. In this example, the receiving terminal device 1 is instructed to acquire time information by operating the operation button 18, and corrects the current time measured by the clock unit 13. Thereafter, the receiving terminal device 1 makes an interrupt request to the transmission control device 2 and transmits a time signal based on the corrected current time to the transmission control device 2. That is, as shown in FIG. 4A, when the operation button 18 is operated to instruct acquisition of time information by a positioning signal from a GPS satellite, as described above, the GPS antenna 15 is used by the GPS receiver 15. 14 receives a positioning signal from a GPS satellite. Then, the GPS receiving unit 15 acquires time information that represents the correct current time, whereby the current time counted by the clock unit 13 is updated with the acquired time information. As a result, the receiving terminal device 1 uses the clock unit 13 to measure the correct current time.

  The receiving terminal device 1 updates the current time measured by the clock unit 13 in this way, and then transmits a time signal based on the accurate current time to the transmission control device 2. As a result, the current time measured in the control system that is communication-controlled by the transmission control device 2 can be updated with the time updated in the receiving terminal device 1. At this time, as shown in FIG. 4B, the receiving terminal device 1 that has updated the current time with a positioning signal from a GPS satellite interrupts the transmission control device 2 to measure the time in the clock unit 13. A time signal based on the accurate current time after update is transmitted to the transmission control device 2.

  That is, when the receiving terminal device 1 receives the positioning signal from the GPS satellite and updates the current time measured by the clock unit 13 and then receives the dummy signal transmitted from the transmission control device 2 by the communication unit 12, An interrupt signal synchronized with the dummy signal is generated by the communication unit 12 and returned to the transmission control device 2. The transmission control device 2 that has received the interrupt signal repeatedly generates and transmits an interrupt polling signal. At this time, when the receiving terminal device 1 receives an interrupt polling signal having address data that matches the higher-order bit of the address stored in the address setting unit 16, the lower-order bit of the address stored in the address setting unit is returned to the signal. Reply as monitoring data synchronized with the period. Thereafter, since a control signal designating the own device is received from the transmission control device 2, a time signal based on monitoring data synchronized with the signal return period of this control signal is returned.

  This time signal includes time information based on the current time measured by the clock unit 13 when the control signal is received, and position information stored in the signal processing unit 17. The time information constituting the time signal may be the current time itself measured by the clock unit 13, or the calculation time in the signal processing unit 17 and the communication time to the transmission control device 2 are added to the current time. It may be the time when When the current time itself measured by the clock unit 13 is used as the time information of the time signal, the transmission control device 2 uses the time signal received by the signal processing unit 17 according to the calculation time and the communication time to the transmission control device 2. Correct the acquired current time.

2. Second Example of Time Signal Transmission Operation for Correcting Current Time A second example of time signal transmission operation in the receiving terminal device 1 will be described below with reference to FIG. In this example, unlike the first example, in the receiving terminal device 1, the signal processing unit 17 recognizes the passage of a predetermined time from the time measured by the clock unit 13, and the receiving operation of the GPS receiving unit 15 is performed every predetermined time. Get time information. That is, as shown in FIG. 5A, when the signal processing unit 17 confirms the current time input from the clock unit 13 and recognizes the elapse of a predetermined time from the previous update operation of the current time. The GPS receiving unit 15 receives a positioning signal from a GPS satellite. At this time, for example, when receiving from a GPS satellite at a rate of once a day, the signal processing unit 17 sets the current time measured by the clock unit 13 to a time set in advance for reception. It is confirmed whether or not it has been reached and whether or not reception from a GPS satellite is possible.

  As described above, when the signal processor 17 recognizes the reception timing from the GPS satellite based on the current time measured by the clock unit 13, the GPS receiver 15 receives the positioning signal from the GPS satellite, as in the first example. The time information and the position information are received and the current time measured by the clock unit 13 is updated. Thereafter, as shown in FIG. 5B, as in the first example, the receiving terminal device 1 first transmits an interrupt signal synchronized with the dummy signal from the transmission control device 2 to the transmission control device 2. Thereafter, the receiving terminal device 1 synchronizes the lower bits of the address stored in the address setting unit with the signal return period in synchronization with the interrupt polling signal having the address data by the upper bits of the address of the own device. Reply as monitoring data. Thereafter, since a control signal designating the own device is received from the transmission control device 2, a time signal including time information based on the current time measured by the clock unit 13 is transmitted to the transmission control device 2.

3. Third Example of Time Signal Transmission Operation for Correcting Current Time A third example of time signal transmission operation in the receiving terminal device 1 will be described below with reference to FIG. In this example, unlike the first example and the second example, the transmission control device 2 transmits a control signal to the receiving terminal device 1 so that the receiving terminal device 1 performs an operation of acquiring time information. Instruct. That is, as shown in FIG. 6A, the transmission control device 2 transmits a control signal including address data for designating the address of the receiving terminal device 1, and the receiving terminal device receives the control signal by the communication unit 12. 1, the control data included in the control signal is analyzed by the signal processing unit 17.

  Then, by analyzing the control data in the signal processing unit 17, the reception terminal device 1 recognizes that the time information acquisition operation has been instructed from the transmission control device 2, and operates the GPS reception unit 13. As a result, as in the first and second examples, the GPS receiver 15 receives a positioning signal from a GPS satellite, acquires time information and position information, and the current time counted by the clock unit 13 is updated. The Note that the control signal transmitted from the transmission control device 2 to the receiving terminal device 1 is transmitted every predetermined time, for example, when a predetermined time is reached every day. The time information acquisition operation may be performed every predetermined time. Thereafter, also in this example, as in the first example and the second example, as shown in FIG. 6B, the receiving terminal device 1 first generates an interrupt signal synchronized with the dummy signal from the transmission control device 2. Send. Thereafter, the receiving terminal device 1 transmits a time signal to the transmission control device 2 in synchronization with the control signal transmitted after the interrupt polling signal indicating the upper address of the own device.

4). Fourth Example of Time Signal Transmission Operation for Correcting Current Time A fourth example of the time signal transmission operation in the reception terminal device 1 will be described below with reference to FIG. Unlike the first to third examples described above, when the receiving terminal device 1 receives a control signal including control data instructing transmission of a time signal from the transmission control device 2 after completing the clock information acquisition operation. The time signal is transmitted in synchronization with this control signal. Further, in this example, as shown in FIG. 7A, the receiving terminal device 1 sends a control signal for instructing an operation of acquiring time information to the transmission control device 2 by the communication unit 12 as in the third example. The time information is received from the positioning signal from the GPS satellite, and the current time counted by the clock unit 13 is updated.

  In addition, about the trigger which starts the acquisition operation | movement of this time information of this receiving terminal device 1, it is not limited to the control signal from the transmission control apparatus 2 shown to Fig.7 (a). That is, as shown in FIG. 4A of the first example, the receiving terminal device 1 may start the time information acquisition operation by operating the operation switch 18. Also, as shown in FIG. 5A of the second example, the signal processing unit 17 recognizes the start time from the current time measured by the clock unit 13, so that the receiving terminal device 1 The time information acquisition operation may be started.

  Thus, after the receiving terminal device 1 acquires time information from the positioning signal from the GPS satellite and updates the current time measured by the clock unit 13, as shown in FIG. 7B, transmission control is performed. The device 2 transmits a control signal having control data serving as a time signal transmission command. This control signal includes address data based on the address of the receiving terminal device 1 in addition to the control data serving as the transmission command for time transmission in order to give the receiving terminal device 1 a time signal transmission command including time information indicating the current time. Have

  Further, as in this example, in FIG. 7A, when the transmission control device 2 transmits a control signal to be a time information acquisition command, the transmission control device 2 gives the time information acquisition command. When it is confirmed that the predetermined time has elapsed, a control signal serving as a time signal transmission command is transmitted. Further, as in the second example, when the receiving terminal device 1 acquires time information at predetermined time intervals based on the time measured by the clock unit 13, the transmission control device 2 transmits a time signal transmission command and The time at which the control signal is transmitted is desirably set to a time that is later than the time at which the receiving terminal device 1 completes the acquisition of the time information.

  Therefore, the receiving terminal device 1 receives the control signal based on the address data matching the address stored in the address setting unit 16 by the communication unit 12, analyzes the control data of this control signal by the signal processing unit 17, and performs transmission control. The device 2 recognizes that the transmission of the time signal has been instructed. Then, the signal processing unit 17 acquires the current time measured by the clock unit 13 as time information, and generates a time signal that becomes monitoring data in the signal return period of the control signal in combination with the already stored position information. To do. As a result, the communication unit 12 returns the time signal to the transmission control device 2 in synchronization with the signal return period of the control signal. Note that the time information in this time signal may be the current time itself measured by the clock unit 13 as in the first to third examples, or the calculation time in the signal processing unit 17 and the transmission control device. The time when the communication time to 2 is added to the current time may be used.

<First Embodiment>
A first embodiment of the control system including the receiving terminal device 1 as described above will be described below with reference to the drawings. FIG. 8 is a block diagram showing the configuration of the control system of this embodiment. In addition, as a control system of each of the following embodiments including this embodiment, a system including a program timer device for performing time schedule control is given as an example. However, as shown in Patent Document 2, a transmission control device or Any of the load terminal devices may be a system including a clock unit.

  As shown in FIG. 8, the control system of the present embodiment includes a program timer device 3 that stores each control content for performing time schedule control, and an input terminal device that receives input of control content of the load device 6. 4, the load terminal device 5 that controls the operation of the load device 6, and the reception terminal device 1 described above are connected to the transmission control device 2 via the signal line Ls. At this time, when the load device 6 is an illuminator and the control content stored in the program timer device 3 or the control content received by the input terminal device 4 is ON / OFF of the load device 6, the load terminal device 5 is constituted by a relay switch for turning on / off the power to the load device 6 and a relay control device for giving a control signal to the relay switch.

(Transmission control device)
In the control system configured as described above, the transmission control device 2 is connected to an external commercial power source and supplies power to each unit in the device, and the signal line Ls as shown in FIG. A communication unit 22 that transmits and receives signals in a time division multiple transmission system, an input key 23 that receives an input from the outside, and a signal processing unit 24 that performs signal processing for executing each operation of the transmission control device 2. And comprising. In this transmission control device 2, the power supply unit 21 converts an external commercial power supply into a DC power supply, and supplies it to the communication unit 22 and the signal processing unit 24 for operation.

  Further, the power supply unit 21 generates a bipolar (± 24V) voltage to be output to the signal line Ls from the input commercial power supply, and supplies the voltage to the communication unit 22. Therefore, the communication unit 22 superimposes the signal generated by the signal processing unit 24 on the bipolar voltage supplied from the power supply unit 21, and transmits the signal to each terminal device connected to the signal line Ls. On the other hand, when the communication unit 22 receives a signal from the terminal device 21, the communication unit 22 extracts a signal superimposed on the bipolar voltage and sends it to the signal processing unit 24.

(Program timer device)
As shown in FIG. 10, the program timer device 3 has the same configuration as the receiving terminal device 1 shown in FIG. 1, and includes a power supply unit 31, a communication unit 32, a clock unit 33, an address setting unit 34, and a signal processing unit 35. An input key 36 for receiving an input from the outside, a liquid crystal display unit 37 for displaying a current time measured by the clock unit 33, an input content received by the input key 36, and a pulse for inputting a pulse signal from the outside. And an input terminal 38. In the program timer device 3 having such a configuration, when the input key 36 is operated, the control content and the control time of each load device 6 in the control system are input and stored in the signal processing unit 35.

  Further, when the signal processing unit 35 recognizes that the stored control time has been reached based on the current time counted by the clock unit 33, the signal processing unit 35 and the load device 6 to be controlled with respect to the control time Read the control contents. At this time, the signal processing unit 35 generates monitoring data for the control signal from the transmission control device 2 based on the address data specifying the load terminal device 5 that controls the load device 6 to be controlled and the control content. To do. In other words, when the stored control time is reached, the communication unit 32 transmits an interrupt signal in synchronization with the dummy signal from the transmission control device 2. After that, after returning to the interrupt polling signal in which the address data is configured by the higher-order bits of the address stored in the address setting unit 34, when the control unit further receives a control signal, the control content to be controlled at the achieved control time Then, monitoring data composed of address data specifying the load terminal device 5 is generated, and the monitoring data is returned from the communication unit 32 to the transmission control device 2.

  Therefore, the transmission control device 2 can recognize the address of the load terminal device 5 to be controlled and the control content at the preset time by the interruption of the program timer device 3. Then, the transmission control device 2 generates a control signal based on the address data of the load terminal device 5 recognized by the interruption of the program timer device 3 and the control data indicating the control content, and from the signal line Ls, It transmits to the target terminal device 5 for load. By operating in this way, the time schedule control set by the program timer device 3 is realized, so that the predetermined load device 6 can be operated at a predetermined operation at a predetermined time.

(Input terminal device)
As shown in FIG. 11, the input terminal device 4 has the same configuration as that of the receiving terminal device 1 shown in FIG. 1, and includes a power supply unit 41, a communication unit 42, an address setting unit 43, a signal processing unit 44, and an external device. And an input key 45 for receiving an input from. When an input from the outside is received by the input key 45, the signal processing unit 44 recognizes the received input content. In order to notify the transmission control device 2 of the input content, first, an interrupt signal synchronized with the dummy signal from the transmission control device 2 is transmitted from the communication unit 42. After that, after returning to the interrupt polling signal in which the address data is configured by the higher-order bits of the address stored in the address setting unit 43, when the communication unit 42 further receives a control signal, the signal processing unit 44 uses the input key 45. Monitoring data based on the received input content is generated and transmitted from the communication unit 42 to the transmission control device 2.

  Based on the input content received by the input key 45, the signal processing unit 44 recognizes the load device 6 to be controlled and its control content. Therefore, the signal processing unit 44 uses the control data based on the load device 6 to be controlled and the control content, and the address data indicating the address of the load terminal device 5 that controls the load device 6 to be controlled. Is generated. And the transmission control apparatus 2 which transmitted the control signal after the interrupt polling signal receives the monitoring data from the input terminal apparatus 4 synchronized with the control signal, so that the load terminal apparatus 5 to be controlled The address and its control contents can be recognized. The transmission control device 2 generates a control signal based on the address data of the load terminal device 5 recognized by the interruption of the input terminal device 4 and the control data indicating the control content, and transmits the control signal from the signal line Ls. To the load terminal device 5. Thereby, according to the input content received with the input key 45 of the input terminal device 4, operation | movement of the target load apparatus 6 can be controlled.

(Load terminal device)
As shown in FIG. 12, the load terminal device 5 is for driving an illuminator that is a load device 6. The load terminal device 5 has the same configuration as that of the reception terminal device 1 shown in FIG. 1. 52, the address setting unit 53, the signal processing unit 54, a plurality of relay switches 55 for turning off / on the power of each of the load devices 6, and the driving of each relay switch 55 based on the signal from the signal processing unit 54. And a relay control unit 56 for controlling. The load terminal device 5 configured as described above transmits a control signal based on the control data in the monitoring data from the transmission control device 2 that has received the monitoring data from the program timer device 3 or the input terminal device 4 by the communication unit 52. Receive. At this time, as to whether or not the control signal from the transmission control device 2 is a control signal for the own device, whether or not the address data of the control signal matches the address stored in the address setting unit 53 in the signal processing unit 54. Is determined.

  When the communication unit 52 receives from the transmission control device 2 a control signal based on address data that matches the address stored in the address setting unit 53, the signal processing unit 54 checks the content of the control data in the control signal. That is, the signal processing unit 54 recognizes the load device 6 to be controlled and the control content (power on / off, etc.) for the load device 6 from the control data. Therefore, the signal processing unit 54 gives a signal to the relay control unit 56 and controls ON / OFF of the relay switch 55 connected to the load device 6 to be controlled according to the control content.

(Time setting in the control system)
In such a control system, the receiving terminal device 1 and the transmission control device 2 perform the operations shown in the above first to fourth examples, so that the receiving terminal device 1 receives time information from a positioning signal from a GPS satellite. Then, the transmission control device 2 receives from the receiving terminal device 1 a time signal based on the exact time. As described above, when the transmission control device 2 receives the time signal based on the accurate time information based on the reception of the positioning signal from the GPS satellite of the receiving terminal device 1 as shown in FIG. ), A time signal based on the received time signal is generated by the signal processing unit 24 and transmitted from the communication unit 22 to the program timer device 3.

  At this time, the time signal transmitted from the transmission control device 2 to the program timer device 3 has the same data structure as the control signal. That is, the time signal transmitted from the transmission control device 2 is composed of address data indicating the address of the program timer device 3 and control data based on time information based on the time information included in the time signal from the receiving terminal device 1. The The time information included in the control data of the time signal transmitted to the program timer device 3 is transmitted from the receiving terminal device 1 to the transmission control device 2 at the current time acquired from the clock unit 13 in the receiving terminal device 1. It is preferable that a time until reception by the program timer device 3 is added later.

  And the program timer apparatus 3 will acquire the time information contained in the control data of a time signal in the signal processing part 35, if the communication part 32 receives the time signal from the transmission control apparatus 2, and confirms the present time. At this time, when the time information included in the control data of the time signal is the current time acquired from the clock unit 13 in the receiving terminal device 1, the program timer device is transmitted after being transmitted from the receiving terminal device 1 to the transmission control device 2. The time until reception at 3 is added. In this way, when the signal processing unit 35 acquires the current time for updating the clock unit 33 from the control data of the time signal, the signal processing unit 35 sends time information based on the acquired current time to the clock unit 33. Therefore, the clock unit 33 updates the current time measured by the current time acquired by the signal processing unit 35 from the time signal.

<Second Embodiment>
A second embodiment of the control system including the receiving terminal device 1 as described above will be described below with reference to the drawings. FIG. 14 is a block diagram showing the configuration of the control system of the present embodiment. The same parts as those of the control system of FIG. 8 are denoted by the same reference numerals, and detailed description thereof is omitted. Further, the configurations of the transmission control device 2, the program timer device 3, the input terminal device 4, and the load terminal device 5 in the present embodiment are shown in FIGS. 9 to 12 as in the first embodiment. It becomes composition.

  As shown in FIG. 14, the control system of the present embodiment is a pulse transmission terminal that outputs a pulse signal to each of the program timer device 3 and the clock device 3a with respect to the control system of the first embodiment (see FIG. 8). The device 7 is added. In the control system having such a configuration, unlike the first embodiment, the pulse transmission terminal device 7 outputs a pulse signal (for example, composed of a polarized signal that becomes one pulse every 30 seconds) to the program timer device 3. Then, the program timer device 3 performs a time measuring operation by the clock unit 33 in synchronization with the pulse signal.

  That is, when the pulse signal from the pulse transmission terminal device 7 is input to the pulse input terminal 38, the program timer device 3 generates a clock based on this pulse signal and supplies it to the clock unit 33. Therefore, the clock unit 33 corrects the timing timing by synchronizing with the clock given from the signal processing unit 35. At this time, when receiving a time signal from the transmission control device 2, the pulse transmission terminal device 7 outputs a pulse signal synchronized with the time signal to the program timer device 3 or the clock device 3a. Therefore, since each of the program timer device 3 and the clock device 3a receives a pulse signal synchronized with an accurate time, the timing measured by the clock unit 33 (not shown for the clock device 3a) is corrected to an accurate timing. Is done.

(Pulse transmission terminal device)
As shown in FIG. 15, the pulse transmission terminal device 7 has the same configuration as the reception terminal device 1 shown in FIG. 1, and includes a power supply unit 71, a communication unit 72, an address setting unit 73, a signal processing unit 74, A pulse signal generation unit 75 that generates a signal and a pulse output terminal 76 that outputs a pulse signal are provided. In the pulse transmission terminal device 7 having such a configuration, the pulse signal generation unit 75 has a built-in crystal oscillator, and a pulse signal output from the pulse output terminal 76 when the crystal oscillator oscillates a clock according to the oscillation. Is generated. The signal processing unit 74 compares the clock generation timing in the pulse signal generated by the pulse signal generation unit 75 with the clock generation timing confirmed from the time information based on the time signal received by the communication unit 72. . Then, the signal processing unit 74 calculates a difference in clock generation timing in the pulse signal and notifies the pulse signal generation unit 75 of the difference.

(Time setting in the control system)
In such a control system, the receiving terminal device 1 and the transmission control device 2 perform the operations shown in the first to fourth examples described above, as in the first embodiment, as shown in FIG. As shown, the transmission control device 2 receives a time signal based on an accurate time from the receiving terminal device 1. Unlike the first embodiment, the transmission control device 2 that receives this time signal generates a time signal based on the received time signal by the signal processing unit 24 as shown in FIG. The signal is transmitted from the unit 22 to the pulse transmission terminal device 7. Therefore, the pulse transmission terminal device 7 receives this time signal by the communication unit 72, and confirms that the address data matches the address stored in the address setting unit 73, so that it is a signal to the device itself.

  Then, as described above, the pulse transmission terminal device 7 that has received the time signal analyzes the time signal by the signal processing unit 74, thereby shifting the clock generation timing deviation of the pulse signal generated by the pulse signal generation unit 75. calculate. Since the deviation of the generation timing is given to the pulse signal generation unit 75, a pulse signal synchronized with an accurate time is generated by the pulse signal generation unit 75 and output to the program timer device 3 from the pulse output terminal 76. . Thereby, in the program timer apparatus 3, since the clock unit 33 performs a time measuring operation in synchronization with a pulse signal synchronized with an accurate time, the program timer device 3 is corrected to measure an accurate current time.

  Similarly, a time signal is transmitted from the transmission control device 2 to the pulse transmission terminal device 7 that outputs a pulse signal to the timepiece device 3a, thereby generating a clock in the pulse signal output to the timepiece device 3a. Timing is corrected. At this time, each pulse transmission terminal device 7 connected to each of the program timer device 3 and the clock device 3a stores the same address in the address setting unit 73, and simultaneously receives the time signal from the transmission control device 2. It is good. Each of the plurality of pulse transmission terminal devices 7 may store an individual address in the address setting unit 73 and receive a time signal transmitted from the transmission control device 2 at different timings.

<Third Embodiment>
A third embodiment of the control system including the receiving terminal device 1 as described above will be described below with reference to the drawings. FIG. 17 is a block diagram showing the configuration of the control system of the present embodiment. The same parts as those of the control system of FIG. 8 are denoted by the same reference numerals, and detailed description thereof is omitted. Further, the configurations of the transmission control device 2, the program timer device 3, the input terminal device 4, and the load terminal device 5 in the present embodiment are shown in FIGS. 9 to 12 as in the first embodiment. It becomes composition.

  As shown in FIG. 17, the control system according to the present embodiment converts the time signal from the transmission control device 2 into a serial transfer system signal with respect to the control system according to the first embodiment (see FIG. 8). The signal conversion terminal device 8 to be output to the serial signal control system 9 is added. Examples of the serial signal control system 9 include a measurement system that measures various data based on time information, and an entrance / exit management system that manages entrance / exit based on time information. When the signal conversion terminal device 8 receives the time signal from the transmission control device 2, the signal conversion terminal device 8 converts the time signal into a serial transfer system signal and outputs it to the serial signal control system 9. Therefore, the serial signal control system 9 can correct the current time being measured based on the signal input from the signal conversion terminal device 8.

(Signal conversion terminal device)
As shown in FIG. 18, the signal conversion terminal device 8 has the same configuration as the reception terminal device 1 shown in FIG. 1, and includes a power supply unit 81, a communication unit 82, a clock unit 83, an address setting unit 84, and a signal processing unit. 85, a signal conversion unit 86 that generates a time signal by a serial transfer method, and a serial communication unit 87 that communicates with the serial signal control system 9. Similarly to the program timer device 3, the signal conversion terminal device 8 configured as described above receives the time signal from the transmission control device 2 by the communication unit 82 and acquires the time information included in the time signal by the signal processing unit 84. Then, the current time measured by the clock unit 83 is corrected.

  After correcting the current time measured by the clock unit 83 in this way, the signal conversion terminal device 8 confirms that it is the transmission timing to the serial signal control system 9 and then passes through the signal processing unit 85 to the clock unit 83. The time information based on the current time measured at is sent to the signal converter 86. Then, after the signal conversion unit 86 converts the time information into a time signal by the serial transfer method, the serial communication unit 87 transmits the time signal by the serial transfer method to the serial signal control system 9.

  Note that the address registered in the address setting unit 84 of the signal conversion terminal device 8 is the same as the address registered in the address setting unit 34 of the program timer device 3, and for each of the signal conversion terminal device 8 and the program timer device 3. Thus, the transmission control device 2 may transmit the time signal at the same time. In addition, the address registered in the address setting unit 84 of the signal conversion terminal device 8 is different from the address registered in the address setting unit 34 of the program timer device 3, and each of the signal conversion terminal device 8 and the program timer device 3 On the other hand, the transmission control device 2 may transmit a time signal at a different timing.

  Further, the signal conversion terminal device 8 in the present embodiment is provided with a function for enabling timer schedule control, similar to the program timer device 3 in the first embodiment, and the program timer device 3 is omitted from the control system. It may be possible. It is also possible to combine the control system of this embodiment with the control system by the pulse transmission terminal device 7 in the second embodiment.

DESCRIPTION OF SYMBOLS 1 Reception terminal device 2 Transmission control device 3 Program timer device 3a Clock device 4 Input terminal device 5 Load terminal device 6 Load device 7 Pulse transmission terminal device 8 Signal conversion terminal device 9 Serial signal control system 11 Power supply unit 12 Communication unit 13 Clock unit 14 GPS receiving unit 15 Antenna 16 Address setting unit 17 Signal processing unit

Claims (5)

Transmission that transmits a control signal to the load terminal device through a time division multiplex transmission system through a load device, a load terminal device that drives and controls the load device, and a signal line connected between the load terminal device A control system comprising: a control device;
A receiving terminal device that receives a positioning signal from a global positioning system satellite and calculates the current time from time information included in the positioning signal ;
A signal conversion terminal device for converting a signal by a time division multiplex transmission method from the transmission control device into a signal by a serial transfer method ;
The receiving terminal device has a waterproof structure in which a mounting frame is provided on the back surface, an operation unit and a display unit are provided on the surface of the main body, and a waterproof cover is covered on the main body surface, and the transmission control device and the Connected by a signal line, sends a time signal according to the current time to the transmission control device through the signal line ,
The signal conversion terminal device
The transmission control device and the signal line are connected,
When the transmission control device that has received a time signal from the receiving terminal device receives the time signal further transmitted, the received time signal is converted into a serial transfer time signal and output. system. In claim 1,
Further equipped with a clock terminal device for measuring the current time,
The watch terminal device
The transmission control device and the signal line are connected,
A control system, wherein when the transmission control device that has received a time signal from the receiving terminal device receives the time signal further transmitted, time correction is performed based on the received time signal. In claim 1,
A pulse transmission terminal device for generating a pulse signal for time correction;
The pulse transmission terminal device
The transmission control device and the signal line are connected,
When receiving the time signal further transmitted by the transmission control device that has received the time signal from the receiving terminal device, the generation period of the pulse in the pulse signal for time correction is corrected by the received time signal. Feature control system. In claim 3,
A control system further comprising: a clock terminal device that receives a pulse signal from the pulse transmission terminal device and counts the current time in synchronization with the pulse signal. A transmission control device for transmitting a control signal in a time division multiplex transmission system ;
The mounting frame is provided on the back surface, the operation unit and the display unit are provided on the surface of the main body, and the waterproof surface is covered with a waterproof cover.
A communication unit that is connected to a signal line connected to the transmission control device, and that transmits and receives signals according to a time division multiplex transmission method;
A clock section that counts the current time,
A positioning signal receiver for receiving positioning signals from global positioning system satellites;
A time correction unit for correcting the current time measured by the clock unit from the time information acquired from the positioning signal reception unit;
With
The positioning signal receiving unit receives a positioning signal from the global positioning system satellite, corrects the current time measured by the clock unit by the time adjustment unit, and transmits the time signal based on the corrected current time to the communication A terminal device used in a control system comprising: a receiving terminal device that transmits to the transmission control device from a unit ;
A communication unit that is connected to a signal line connected to the transmission control device, and that transmits and receives signals according to a time division multiplex transmission method;
A signal converter for converting a signal by a time division multiplex transmission method received by the communication unit into a signal by a serial transfer method;
A signal output unit for outputting a signal by the serial transfer method generated by the signal conversion unit;
With
When the communication unit receives the time signal further transmitted by the transmission control device that has received the time signal from the receiving terminal device, the signal conversion unit converts the received time signal into a time signal by a serial transfer method. A signal conversion terminal device for converting.

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