JP7817072B2 - Wireless terminal and data transmission system - Google Patents

Description

This disclosure relates to a wireless terminal that wirelessly outputs data input via a wired connection, and a data transmission system that uses the wireless terminal.

Conventional wireless terminals include those that have multiple input units to which multiple detection devices are wired as multiple data generation sources, and wirelessly output data received from these multiple data generation sources to, for example, a management terminal (see, for example, Patent Document 1).

JP-A-10-070519 (paragraphs [0014] to [0018] and Figure 1)

However, multiple data generation sources may be located in a first area where wireless communication is difficult, and the distance to a second area where wireless communication is possible may be large. In such cases, there is a problem of the time and expense required to run multiple cables connecting the multiple data generation sources in the first area with wireless terminals in the second area, and a solution to this problem is needed.

The invention of claim 1, made to achieve the above object, is a wireless terminal that wirelessly outputs data that is input via a wired connection to multiple input units, and has a wired output unit that outputs via a wired connection the data that is input via a wired connection to one of the input units of another of the wireless terminals.

The invention of claim 2 is a wireless terminal as described in claim 1 that acquires via a cable structured data output by a first detection device in a governor room with the detection data stored in a data frame, and unstructured data output by a second detection device in the governor room with the detection data not stored in a data frame, and wirelessly outputs the structured data from a wireless output unit. The wireless terminal includes: a first input unit to which the structured data is input; a second input unit to which the unstructured data is input; a wired output unit connected to the first input unit via a relay line for wired output of the structured data input to the first input unit without changing the data structure; and a data conversion unit that converts the data structure of the unstructured data input to the second input unit into the structured data having the data frame and outputs the structured data to the relay line.

The invention of claim 3 is the wireless terminal described in claim 2, which includes an output selector switch that is provided on the relay line and normally connects the wired output unit to the first input unit and disconnects it from the data conversion unit, and when the data conversion unit outputs the standard data to the relay line, switches the wired output unit to disconnect it from the first input unit and connect it to the data conversion unit.

The invention of claim 4 is a wireless terminal according to claim 2 or 3, in which the first detection device is a pressure detector that detects the pressure in the gas pipe of the governor chamber, and the second detection device is an abnormality detector that detects abnormal gas leaks, abnormal heat generation, or abnormal vibrations in the governor chamber.

The invention of claim 5 is a data transmission system that includes a plurality of wireless terminals according to any one of claims 1 to 3, connected by wire, that transmits and receives input data between the plurality of wireless terminals via wired communication, and that transmits the input data to a location where wireless communication is possible.

The invention of claim 6 is a data transmission system having first and second wireless terminals that are the wireless terminals described in claim 2 or 3, wherein in the first wireless terminal, the first detector is wired connected to the first input unit and the second detector is wired connected to the second input unit, and the standardized data is wiredly output from the wired output unit; and in the second wireless terminal, the wired output unit of the first wireless terminal is wired connected to the first input unit, and the standardized data is wirelessly output from the wireless output unit.

The invention of claim 7 is a data transmission system according to claim 6, wherein, in the first wireless terminal, the standard data input to the first input unit is output from the data conversion unit to the relay line on the condition that the standard data input to the first input unit of the second wireless terminal is not being output from the wired output unit to the first input unit of the second wireless terminal.

According to the configurations of claims 1 and 5, multiple wireless terminals can be connected in series to multiple data generation sources, with only the end wireless terminal being used as a wireless device and the intermediate wireless terminals being used as repeaters. Here, the wireless terminal has a wired output unit that outputs data input via wired connections to multiple input units to one input unit of another wireless terminal via wired connections. Therefore, using a wireless terminal as a repeater reduces the number of cables to the wireless terminal being used as a wireless device, thereby reducing the effort and cost required to manage the cables extending from multiple data generation sources. Note that a wireless terminal may be provided with only one wired output unit, or multiple wired output units. In other words, a wireless terminal may have multiple wired output units, and multiple groups of multiple input units corresponding to each of the wired output units.

The wireless terminal of the present disclosure may be used as a wireless terminal connected to a detection device located in a governor room, as in claims 2 and 6. The governor room may be located in a location with a poor wireless communication environment. The wireless terminals of claims 2 and 6 include a first input unit to which structured data stored in a data frame is input, and the structured data is output from a wired output unit connected to the first input unit via a relay line. Therefore, by connecting the wired output unit to the first input unit of another wireless terminal, the structured data output from the wired output unit can be input to the first input unit of the other wireless terminal without changing the data structure. Furthermore, a second input unit to which unstructured data not stored in a data frame is input is also included, and the unstructured data is converted by a data conversion unit into structured data having a data frame and then output from the wired output unit via the relay line. This means that even if both standard and unstandard data are input to a wireless terminal, the unstandard data is converted into standard data before being output, so communication between wireless terminals can be done using only standard data, which can be transmitted over a single cable.

According to the configuration of claim 3, the relay line is equipped with an output selector switch that switches the connection with the wired output unit between the first input unit and the data conversion unit, thereby preventing data interference in the relay line. In this case, if the first detection device connected to the first input unit is a pressure detector that detects the pressure in the gas pipe in the governor chamber, and the second detection device connected to the second input unit is an abnormality detector that detects gas leak abnormalities, heat generation abnormalities, or vibration abnormalities in the governor chamber (invention of claim 4), the wired output unit will normally output pressure information obtained from the pressure detector, and only when an abnormality is detected by the abnormality detector can the wired output unit output abnormality information obtained from the abnormality detector.

The output selector switch may normally connect the wired output unit to the data conversion unit so that standard data from the data conversion unit is output from the wired output unit, and when standard data is input to the first input unit, the connection with the wired output unit may be switched from the data conversion unit to the first input unit.

Furthermore, as in claim 7, the structured data from the data conversion unit may be output to the relay line and output from the wired output unit, provided that the structured data input to the first input unit is not being output from the wired output unit. In this case, an output selector switch may also be provided on the relay line, so that the first input unit and the wired output unit are normally connected and the structured data input to the first input unit is output from the wired output unit, and when unstructured data is input to the second input unit and converted to structured data by the data conversion unit, the output selector switch may connect the wired output unit and the data conversion unit and output the structured data from the data conversion unit to the relay line, provided that the structured data input to the first input unit is not being output from the wired output unit. Furthermore, when unstructured data is input to the second input unit and converted into structured data by the data conversion unit, even if the structured data input to the first input unit is being output from the wired output unit, the output selector switch may disconnect the first input unit from the wired output unit and connect the wired output unit to the data conversion unit, giving priority to the output of structured data from the data conversion unit, or the configuration may not include an output selector switch.

Conceptual diagram of a governor monitoring system according to an embodiment of the present disclosure. A block diagram showing the control configuration of a pressure detector and a gas leak detector. Communication unit circuit block diagram Block diagram showing the control configuration of the control circuit Control program flowchart

An embodiment of the governor monitoring system 100 of the present disclosure will be described with reference to Figures 1 to 5. Reference numeral 10 in Figure 1 denotes a governor room 10 installed at various locations in the city gas supply network. The governor room 10 includes a governor 11. The governor 11 is installed in a gas pipe 90 and reduces the pressure of gas supplied from a gas production plant at a relatively high pressure (e.g., 100 kPa or higher) to a predetermined set pressure (e.g., less than 3 kPa) and automatically adjusts the valve opening to maintain a substantially constant set pressure. In addition to the governor 11, the governor room 10 also includes a pressure detector 12, a gas leak detector 30, and other devices. Information detected by the pressure detector 12, gas leak detector 30, and other devices is acquired by a communication unit 20 and collected in a monitoring device 50, allowing remote monitoring of the city gas supply status. The communication unit 20 and monitoring device 50 are connected via a communication network 101, which includes a wireless base station 400. The governor 11, pressure detector 12, gas leak detector 30, communication unit 20, and monitoring device 50 make up the governor monitoring system 100.

The pressure detector 12 has a pair of pressure sensors 13 and a sensor control unit 14. The pair of pressure sensors 13 are arranged in the gas pipe 90, one upstream and one downstream of the governor 11, and are connected to the sensor control unit 14 via a cable. The sensor control unit 14 has a CPU 14A and memory 14B (see Figure 2). The CPU 14A controls the pair of pressure sensors 13 to execute a predetermined signal processing program. The memory 14B stores the signal processing program and pressure information measured by the pressure sensors 13. The CPU 14A executes the signal processing program, thereby functioning as a control block for the trigger generation unit 15, data generation unit 16, data transmission unit 17, and other units shown in Figure 2. The pressure detector 12 also has a battery (not shown) that supplies power to the pair of pressure sensors 13, the sensor control unit 14, and other units.

Specifically, when the signal processing program is executed, as shown in FIG. 2, the trigger generation unit 15 generates a measurement trigger at regular intervals (e.g., every 0.5 seconds), and each time a measurement trigger is generated, a pair of pressure sensors 13 samples the primary pressure upstream of the governor 11 and the secondary pressure downstream of the governor 11. The data generation unit 16 converts the sampled primary and secondary pressure data into digital signals to generate pressure data D1, which is then sent to the data transmission unit 17.

The data transmission unit 17 generates standard data T1, which stores pressure data D1, its measurement time, and the identification number of the governor chamber 10 in a data frame of a predetermined data length. Here, memory 14B temporarily stores the pressure data D1 generated by the data generation unit 16, and the data transmission unit 17 stores multiple pieces of pressure data D1 read from memory 14B in the standard data T1 (in this embodiment, for example, 10 pieces of pressure data D1 are stored). Then, the trigger generation unit 15 generates a transmission trigger at a predetermined interval (for example, every 5 seconds), and each time a transmission trigger is generated, the data transmission unit 17 transmits the generated standard data T1 to the communication unit 20 via cable 40A.

If the value indicated by the generated pressure data D1 exceeds a predetermined upper limit, the data transmission unit 17 determines that an abnormality has occurred and stores the abnormality information in the standard data D1, and also activates an emergency shutoff device (not shown) in the governor chamber 10 to shut off the supply of gas downstream of the governor 11.

As shown in FIG. 2, the gas leak detector 30 includes a gas leak sensor 31 and a sensor control unit 32. The sensor control unit 32 activates the gas leak sensor 31, for example, every fixed period (2 minutes), to detect gas leaks within the governor chamber 10. Only when the gas leak sensor 31 detects a gas leak does the sensor control unit 32 generate unstructured data D2 containing the gas leak information and output it to the communication unit 20 via cable 40B. The unstructured data D2 is data that is not stored in a data frame. The gas leak detector 30 includes a battery (not shown) that supplies power to the gas leak sensor 31, the sensor control unit 32, and the like. Here, the gas leak detector 30 corresponds to the "abnormality detector" in the claims.

In addition, if the gas leak sensor 31 detects a gas leak, the emergency shutoff device will be activated to cut off the supply of gas downstream of the governor 11.

As shown in FIG. 1, the communication unit 20 is located outside the governor room 10 and is composed of a pair of wireless terminals 21. One of the pair of wireless terminals 21, wireless terminal 21A, is disposed near the governor room 20 and is connected to the pressure detector 12 and gas leak detector 13 inside the governor room 10 via the aforementioned cables 40A and 40B. In other words, one wireless terminal 21A is located in a location near the governor room 10 where the wireless communication environment is poor. In contrast, the other wireless terminal 21B is located in a location where wireless communication is possible and is connected to the other wireless terminal 21A via cable 40C. Hereinafter, when the pair of wireless terminals 21 need to be distinguished, they will be referred to as wireless terminals 21A and 21B, and when not distinguished, they will be referred to as wireless terminal 21.

Wireless terminals 21A and 21B have the same configuration, and as shown in FIG. 3, include a radio circuit 22, an antenna 22A, a control circuit 23, a mode selector switch 24, an output selector switch 25, a first input terminal 26A, a second input terminal 26B, and an output terminal 27. Wireless terminals 21A and 21B also include a power supply circuit (not shown), which is connected to a commercial power source (not shown) to supply operating power to each circuit.

The mode selector switch 24 sets the wireless terminal 21 to either a mode in which data input to the wireless terminal 21 is output wirelessly (wireless output mode) or a mode in which data is output via a wired connection between the wireless terminals 21 (wired output mode). Specifically, when the mode selector switch 24 sets the wireless terminal 21 to the wired output mode, the first input terminal 26A is set to connect to the output terminal 27. When the mode selector switch 24 sets the wireless terminal 21 to the wireless output mode, the first input terminal 26A is set to connect to the control circuit 23. On the other hand, the second input terminal 26B is connected to the control circuit 23 regardless of whether the mode is wireless or wired. In this embodiment, when the wireless terminal 21A is set to the wired output mode and the wireless terminal 21B is set to the wired output mode, the output terminal 27 of the wireless terminal 21A and the first input terminal 26A of the wireless terminal 21B are connected by the cable 40C, and data output from the output terminal 27 of the wireless terminal 21A is input to the first input terminal 26A of the wireless terminal 21B via the cable 40C.

As a result, data input to the first input terminal 26A of wireless terminal 21A is output directly from output terminal 27 and input to the first input terminal 26A of wireless terminal 21B. Meanwhile, data input to the second input terminal 26B of wireless terminal 21A is output from output terminal 27 via control circuit 23, as described below, and input to the first input terminal 26A of wireless terminal 21B. The data input to the first input terminal 26A of wireless terminal 21B is then captured by control circuit 23 and wirelessly transmitted by wireless circuit 22. In other words, wireless terminal 21B is used as a wireless device, and wireless terminal 21A is used as a repeater.

The mode selector switch 24 may be switched between wired output mode and wireless output mode, for example, by manually operating an operation unit located on the exterior surface of the case that houses the wireless terminal 21, or by inputting a switching input signal from outside to the control circuit 23.

Here, the first input terminal 26A is configured to allow input of data stored in a data frame, and the second input terminal 26B is configured to allow input of data not stored in a data frame. As a result, in this embodiment, the sensor control unit 14 of the pressure detector 12 is connected to the first input terminal 26A of the wireless terminal 21A via cable 40A, and the sensor control unit 32 of the gas leak detector 30 is connected to the second input terminal 26B via cable 40B.

Then, the regular data T1 transmitted by the pressure detector 12 is input to the first input terminal 26A of the wireless terminal 21A, output from the output terminal 27, and input to the first input terminal 26A of the wireless terminal 21B via cable 40C without changing the data structure. Meanwhile, the irregular data D2 transmitted by the gas leak detector 30 is input to the second input terminal 26B of the wireless terminal 21A, imported into the control circuit 23, and converted into regular data T2 having a data frame. In the wired output mode, as mentioned above, the output terminal 27 is normally connected to the first input terminal 26A. However, the output selector switch 25, located midway between the first input terminal 26A and the output terminal 27, disconnects the first input terminal 26B and switches the connection to the control circuit 23. When the output selector switch 25 switches the connection of the output terminal 27 from the first input terminal 26A to the control circuit 23, the converted standard data D2 is output from the output terminal 27 and input to the first input terminal 26A of the wireless terminal 21B via the cable 40C without changing the data structure.

The output selector switch 25 is controlled by the control circuit 23 and is activated when the wireless terminal 21 is set to wired output mode. The output selector switch 25 normally keeps the output terminal 27 connected to the first input terminal 26A, and after the unformatted data D2 transmitted by the gas leak detector 30 is converted into formatted data T2, it disconnects the output terminal 27 from the first input terminal 26B and switches the output terminal 27 to be connected to the control circuit 23. Hereinafter, the normal state in which the output terminal 27 is connected to the first input terminal 26A will be referred to as the first connection state, and the state in which the output terminal 27 is connected to the control circuit 23 will be referred to as the second connection state.

Here, the first input terminal 26A in this embodiment corresponds to the "first input section" in the claims, the second input terminal 26B corresponds to the "second input section" in the claims, the output terminal 27 corresponds to the "wired output section" in the claims, the connection between the first input terminal 26A and the output terminal 27 corresponds to the "relay line" in the claims, and the system that wirelessly transmits the structured data T1 and unstructured data D2 detected by the pressure detector 12 and the gas leak detector 30 via the wireless terminals 21A and 21B corresponds to the "data transmission system" in the claims.

The control circuit 23 mainly comprises a microcomputer 28 including a CPU 28A and memory 28B such as RAM, ROM, or flash memory. It is connected to the output selector switch 25 and the radio circuit 22, and controls these to execute the control program PG1 (see Figure 5), which will be described later. To this end, the control program PG1 and other programs are stored in the memory 28B.

The control circuit 23 has the control blocks shown in Figure 4. Specifically, the CPU 28A executes a number of predetermined programs, including the aforementioned control program PG1, to function as a data conversion unit 41, a mode determination unit 42, a communication monitoring unit 43, an output switching unit 44, and the like.

When unstructured data D2 is input to the second input terminal 26B, the data conversion unit 41 generates structured data T2 by storing the input unstructured data D2 in a data frame of a predetermined data length, along with the time of input and the identification number of the governor room 10. After generating structured data T2, the mode determination unit 42 determines whether the wireless terminal 21 is set to wired output mode or wireless output mode, and executes control program PG1 if it determines that the wireless terminal 21 is set to wired output mode. In other words, in this embodiment, in the wireless terminal 21A, the CPU 28A executes control program PG1 each time the data conversion unit 41 generates structured data T2 from unstructured data D2 input to the second input terminal 26B.

When control program PG1 is executed, the communication monitoring unit 43 first monitors whether the standard data T1 input by the pressure detector 12 is being output from the output terminal 27. In wired output mode, the output terminal 27 is normally in the first connection state, and the standard data T1 input to the first input terminal 26A is output from the output terminal 27 at regular intervals. The communication monitoring unit 43 then checks whether the standard data T1 is being output from the output terminal 27. When it confirms that the standard data T1 is not being output, the output switching unit 44 controls the output switching switch 25 to switch the connection state of the output terminal 27 from the first connection state to the second connection state, and outputs the standard data T2 from the output terminal 27. Then, when the output of the standard data T2 is completed, the output switching unit 44 controls the output switching switch 25 to change the connection state of the output terminal 27 back from the second connection state to the first connection state.

On the other hand, if the communication monitoring unit 43 confirms that the standard data T1 is being output, the output switching unit 44 controls the output switching switch 25 after the output of the standard data T1 has finished, switches the connection state of the output terminal 27 from the first connection state to the second connection state, and outputs the standard data T2 from the output terminal 27.

Then, the standard data T1 and T2 output from the output terminal 27 of wireless terminal 21A are input to the first input terminal 26A of wireless terminal 21B. There is no need to change the data structure of the standard data T1 and T2 in the data conversion unit 41, and because wireless output mode is set, the standard data T1 and T2 input to wireless terminal 21B are directly imported into the wireless transmission unit 45 and wirelessly transmitted from the wireless circuit 22.

The standard data T1 and T2 transmitted by the wireless transmitter 45 are collected by the monitoring device 50 via the general-purpose communication line 300. The monitoring device 50 is installed in a remote location away from each governor room 10 and is composed of a computer such as a server computer or a personal computer. The monitoring device 50 can remotely monitor the city gas supply status and the presence or absence of abnormalities in real time based on the pressure data D1 and information on gas leaks, etc., contained in the standard data T1 and T2. Here, for example, the sensor control unit 13 of the pressure detector 12 may be connected to the governor 11 or the aforementioned emergency shutoff device, etc., so that if the monitoring device 50 detects an abnormality in the governor room 10, it can issue commands to stop the governor 11 or open/close the emergency shutoff device to the communication unit 20, which is the source of the standard data T1 and T2. The monitoring device 50 may also be a cloud server consisting of multiple servers.

An example of the control program PG1 executed by the CPU 28A of the wireless terminal 21A is shown in Figure 5. As described above, the control program PG1 is executed in wired output mode each time unstructured data D2 is input to the second input terminal 26B of the wireless terminal 21A and structured data T2 is generated from the input unstructured data D2 (YES in S11). Then, in step S12, it determines whether structured data T1 from the pressure detector 12 is being output from the output terminal 27. If it is determined that structured data T1 is not being output from the output terminal 27 (NO in S12), it operates the output selector switch 25 to switch the connection state of the output terminal 27 from the first connection state to the second connection state (S13), and the structured data T2 is output from the output terminal 27 (S14).

On the other hand, if the standard data T1 is being output from the output terminal 27 (YES in S12), the CPU 28A waits until the output of the standard data T1 has finished (NO in S12), then operates the output selector switch 25 to switch the connection state of the output terminal 27 from the first connection state to the second connection state (S13), and outputs the standard data T2 from the output terminal 27 (S14). Then, once the output of the standard data T2 has finished, the output selector switch 25 is operated to return the connection state of the output terminal 27 from the second connection state to the first connection state (S15). Here, the CPU 28A executing step S11 corresponds to the data conversion unit 41 described above, the CPU 28A executing step S12 corresponds to the communication monitoring unit 43 described above, and the CPU 28A executing steps S13 to S15 corresponds to the output selector unit 44 described above.

This concludes the description of the configuration of the governor monitoring system 100 of this embodiment. In the governor monitoring system 100 of this embodiment, information such as the pressure and gas leaks in the gas pipe 90 in the governor room 10 is acquired by the communication unit 20 and wirelessly transmitted to the monitoring device 50 via the general-purpose communication line 300. The communication unit 20 of this embodiment comprises a pair of wireless terminals 21, each of which can be switched to a wired output mode that allows input data to be communicated between the wireless terminals 21 via a wired connection. In this embodiment, the pair of wireless terminals 21 are connected in series to the pressure detector 12 and the gas leak detector 30. The pair of wireless terminals 21 are comprised of a wireless terminal 21A that is located in a location where the wireless communication environment is poor and is used in the wired output mode, and a wireless terminal 21B that is located in a location where wireless communication is possible and is used in the wireless output mode. Wireless terminal 21A is wired to pressure detector 12 and gas leak detector 30, receiving data from them via first input terminal 26A and second input terminal 26B, and wired outputting the data from output terminal 27 to first input terminal 26A of wireless terminal 21B. While multiple cables are required between wireless terminal 21A and pressure detector 12 and gas leak detector 30, a single cable is used to connect wireless terminal 21A and wireless terminal 21B. Therefore, using wireless terminal 21A as a repeater reduces the number of cables to wireless terminal 21B, which is used as a wireless device. This reduces the effort and cost required to route the cables extending from pressure detector 12 and gas leak detector 30. Wireless terminal 21 may be provided with only one output terminal 27 or multiple output terminals 27. That is, wireless terminal 21 may have multiple output terminals 27, each with multiple groups of input terminals corresponding to the output terminals 27.

In addition, in this embodiment, the first input terminal 26A receives the structured data T1 and T2 stored in a data frame, and the second input terminal 26B receives the unstructured data D2 not stored in a data frame. In wired output mode, the structured data T1 and T2 input to the first input terminal 26A can be output via wire from the output terminal 27 to the first input terminal 26A of another wireless terminal 21 without changing the data structure. In contrast, the unstructured data D2 is converted into structured data T2 having a data frame before being output via wire from the output terminal 27. This allows the wireless terminal 21 to receive both structured data T1 and unstructured data D2 between the pressure detector 12 and the gas leak detector 30. However, communication between the wireless terminals 21 is configured to involve only the exchange of structured data T1 and T2 without the need to change the data structure. Therefore, no complex processing is required when using the wireless terminal 21 in wired output mode.

In addition, in this embodiment, in wireless terminal 21A in wired output mode, first input terminal 26A and output terminal 27 are normally connected, and standard data T1 from pressure detector 12, which is input at a constant interval, is output directly from output terminal 27 and input to first input terminal 26A of wireless terminal 21B. When gas leak detector 30 detects a gas leak and inputs unstandardized data D2 to second input terminal 26B, the unstandardized data D2 is converted to standardized data T2, and then output selector switch 25 disconnects output terminal 27 from first input terminal 26B and switches output terminal 27 to connect to control circuit 23. The converted standardized data D2 is then output from output terminal 27 and input to first input terminal 26A of wireless terminal 21B. This allows standardized data T2 from gas leak detector 30 to be transmitted without interference with standardized data T1 from pressure detector 12.

Furthermore, in this embodiment, in the wireless terminal 21A in wired output mode, after non-standard data D2 is input to the second input terminal 26B and converted into standard data T2, it is confirmed that standard data T1 from the pressure detector 12 is not being output from the output terminal 27, and then the output selector switch 25 is switched to connect the output terminal 27 to the control circuit 23. This allows standard data T2 to be transmitted without interrupting the standard data T1 being output and without interfering with the standard data T1.

Other Embodiments
(1) In the above embodiment, the gas leak detector 30 is connected to the second input terminal 26B of the wireless terminal 21A, but an abnormality detector that detects abnormal heat generation or abnormal shaking may also be connected. Furthermore, the wireless terminal 21 may be provided with input terminals in addition to the first and second input terminals 26A and 26B, and multiple such abnormality detectors may be connected.

(2) In the above embodiment, the data transmission unit 17 was configured to transmit multiple measurement results measured by the pressure sensor 13 at a predetermined interval. However, it may also be configured to transmit each measurement made by the pressure sensor 13 one by one.

(3) In the above embodiment, when the communication monitoring unit 43 was outputting the standard data T1 from the pressure detector 12 from the output terminal 27, after the output had finished, the output changeover switch 25 switched the connection state of the output terminal 27 from the first connection state to the second connection state, and standard data T2 was output from the output terminal 27. However, since standard data T2 is data that requires urgency, the output may be interrupted without waiting for the output of standard data T1 to finish, and the connection state of the output terminal 27 may be switched to the second connection state, and standard data T2 may be output from the output terminal 27 with priority.

(4) The communication unit 20 may include only the wireless terminal 21A, and may be configured to switch between wireless output mode and wired output mode as appropriate. When outputting in wireless output mode, there is a risk of interference between the wireless transmission of the standard data T2 generated by the data conversion unit 41 and the wireless transmission of the standard data T1. Therefore, for example, the transmission of the standard data T2, which requires urgency, may be given priority. Alternatively, if standard data T1 is currently being transmitted, that transmission may be interrupted before the standard data T2 is sent. Furthermore, if standard data T1 is currently being transmitted, the standard data T2 may be sent after the transmission of the standard data T1 has finished.

Furthermore, the communication unit 20 may be configured to include only the wireless terminal 21A and perform both wireless and wired output simultaneously.

(5) The communication unit 20 may include three or more wireless terminals 21. In this case, the multiple wireless terminals 21 are connected in series to the pressure detector 12 and the gas leak detector 30, with only the terminal wireless terminal 21 being used in wireless output mode and the intermediate wireless terminals being used in wired output mode.

Note that while the present specification and drawings disclose specific examples of technology included within the scope of the claims, the technology described in the claims is not limited to these specific examples and includes various modifications and variations of the specific examples, as well as parts of the specific examples taken independently.

10 Governor chamber 12 Pressure detector (first detector)
21A, 21B: Wireless terminal 22: Wireless circuit (wireless output unit)
25 Output selector switch 26A First input terminal (first input section)
26B Second input terminal (second input section)
27 Output terminal (wired output section)
30 Gas leak detector (second detection device)
40A, 40B Cable 41 Data conversion unit D2 Non-standard data T1, T2 Standard data

Claims (7)

A wireless terminal that wirelessly outputs data input via wired connections to a plurality of input units,
a wireless terminal having a wired output section that outputs data input via wire to the plurality of input sections via wire to one of the input sections of another of the wireless terminals; 2. A wireless terminal according to claim 1, wherein the wireless terminal acquires via a cable standard data output by a first detecting device in a governor room with the detected data stored in a data frame, and unstandard data output by a second detecting device in the governor room with the detected data not stored in a data frame, and wirelessly outputs the standard data from a wireless output unit,
a first input unit to which the standard data is input;
a second input unit to which the unstructured data is input;
a wired output unit connected to the first input unit via a relay line for outputting the standard data input to the first input unit via a wired connection without changing the data structure;
a data conversion unit that converts the data structure of the unstructured data input to the second input unit into the structured data having the data frame and outputs the structured data to the relay line. The wireless terminal according to claim 2, further comprising an output selector switch provided on the relay line, which normally connects the wired output unit to the first input unit and disconnects it from the data conversion unit, and which switches so that when the data conversion unit outputs the standard data to the relay line, the wired output unit is disconnected from the first input unit and connected to the data conversion unit. the first detection device is a pressure detector that detects a pressure in a gas pipe of the governor chamber,
4. The wireless terminal according to claim 2, wherein the second detecting device is an abnormality detector that detects abnormal gas leakage, abnormal heat generation, or abnormal vibration in the governor chamber. A plurality of wireless terminals according to any one of claims 1 to 3 are provided and connected by wire;
A data transmission system that transmits and receives the input data between the plurality of wireless terminals by wired communication, and transmits the input data to a location where wireless communication is possible. A method for transmitting a wireless communication signal to a wireless terminal according to claim 1, wherein the first and second wireless terminals are the wireless terminals according to claim 2 or 3,
In the first wireless terminal, the first detector is connected to the first input unit by wire, and the second detector is connected to the second input unit by wire, and the standard data is output from the wired output unit by wire;
In the second wireless terminal, the wired output unit of the first wireless terminal is wired connected to the first input unit, and the standardized data is wirelessly output from the wireless output unit. A data transmission system as described in claim 6, wherein, in the first wireless terminal, the standard data input to the first input unit is output to the relay line from the data conversion unit on the condition that the standard data input to the first input unit of the second wireless terminal is not being output from the wired output unit to the first input unit of the second wireless terminal.