JP4333250B2 - Monitoring system for disaster prevention lighting - Google Patents

Description

  The present invention relates to a monitoring system for disaster prevention lighting using the RS485 method.

  Conventionally, there has been a concept of a security system in which a control panel for controlling a human sensor, a thermal sensor, a TV camera, or the like is connected to each device via a network and information on each device is monitored. However, when trying to actually construct such a system, the total wiring length of the signal lines may become long.

Here, the problem with respect to the total wiring length of the signal line differs depending on what kind of communication system is adopted as the physical layer of the network. When communicating, it was necessary to take a one-stroke wiring of up to 1200 m due to the limitation of the standard.
JP 2000-284872 A

  By the way, the present inventors have described the disaster prevention lighting monitoring system for monitoring information of each terminal by connecting a disaster prevention lighting terminal such as a guide light having a communication function and a control panel for monitoring and controlling them through a network. Although the use of the RS485 method was considered, even in this case, the restriction of one-stroke wiring at the maximum of 1200 m does not change.

For example, be considered a 1 if the floor is arranged a guide light only the four corners of the 50 m × 50 m 8-story building 2500 m ² of a simple calculation, 200 meters (50 m × 4 sides) × 8 (floor) + 3m (Ceiling height) × 7> 1200 m, which exceeds the limit.

  Furthermore, as the number of disaster prevention devices installed per floor increases or the floor area increases, the length of the routed wiring becomes longer, and wiring within the above limits becomes increasingly difficult. In that case, for example, as shown in FIG. 6, it is considered that the control panel B and the terminal Tn are connected via a plurality of repeaters R1 and R2, but if the cost of the entire system is considered, the repeater Each time it is added, the cost increases, and a repeater may not be provided separately because of securing the power supply or installation space.

  The present invention has been made in view of such a point, and an object of the present invention is to use a general-purpose RS485 system as a physical layer of a network and to provide a repeater when routing a communication signal line. It is to provide a monitoring system for disaster prevention lighting that can be wired without increasing the number of guide lights.

In order to solve the above problems, the present invention, as shown in FIGS. 1 to 5, a disaster prevention lighting terminal such as a guide light having a communication function, and a state of each terminal by connecting these disaster prevention lighting terminals to a network Is a monitoring system for disaster prevention lighting that uses a communication system of RS485 as a physical layer of a network, and includes a control panel and each disaster prevention lighting terminal. Using the polling method as the communication protocol, the control panel manages the polling token and sends / receives status monitoring / inspection commands to each disaster prevention lighting terminal. One set of microcomputer ports in the control panel of driving a plurality of RS485 driver serial port, wherein the one set serial port, a transmit port of the serial data, the serial data And signal port, in which at all times is characterized in that a combination of transmission enable control port to switch the RS485 driver that is the receiving state to the transmitting state.

  According to the present invention, by driving a plurality of RS485 drivers with one set of serial ports among the microcomputer ports in the control panel, it is possible to take a configuration in which signal lines are branched in the control panel. Although the maximum wiring length is restricted by the RS485 standard, the entire system has a wiring length that is n times that when a signal line is routed in one system, and the restriction when routing the signal line is improved. In addition, since it is not necessary to prepare serial ports corresponding to the number of systems, the problem of using a microcomputer with a large number of serial ports or using a few microcomputers when the number of serial ports is insufficient is solved.

  FIG. 1 is a circuit diagram showing a circuit configuration in a control panel in the monitoring system for disaster prevention lighting according to the present invention. FIG. 2 is a diagram showing a connection relationship between the control panel B and the disaster prevention lighting terminals of the systems 1, 2,..., N. FIG. 3 is a front view showing a state in which the cover C of the control panel B is opened.

  In FIG. 1, the microcomputer M has a control function for monitoring the state of a plurality of disaster prevention lighting terminals and transmitting inspection commands, and between the disaster prevention lighting terminals of each system 1, 2,. In order to transmit and receive serial data, a serial data transmission port TxD, a serial data reception port RxD, and a transmission enable control port DE / RE are provided. D1, D2,..., Dn are RS485 drivers, which receive the transmission data from the serial data transmission port TxD of the microcomputer M and the transmission enable signal from the transmission enable control port DE / RE. Received data from each RS485 driver D1, D2,..., Dn is input to the serial data reception port RxD of the microcomputer M via the AND gate G. Here, the received data from each RS485 driver D1, D2,..., Dn is set to data that is at the H level when there is no signal and is at the L level when a signal is detected, so that a plurality of RS485 drivers D1, D2,. Only when any one of Dn is receiving a signal, the received data of the driver passes through the AND gate G and is input to the serial data receiving port RxD of the microcomputer M.

  The transmission enable control port DE / RE of the microcomputer M switches whether the plurality of RS485 drivers D1, D2,..., Dn are in a transmission state or a reception state. For example, when the transmission enable control port DE / RE is at the L level, each driver is in the transmission state, and when it is at the H level, each driver is in the reception state. In the transmission state, transmission data output from the serial data transmission port TxD of the microcomputer M is output from the RS485 drivers D1, D2,..., Dn to the signal lines of the respective systems 1, 2,. When in the reception state, the RS485 drivers D1, D2,..., Dn are in a high impedance state when viewed from the signal line, and are in a state where signals from the disaster prevention lighting terminal can be received.

  As shown in FIG. 2, the control panel B and the disaster prevention lighting terminals of the systems 1, 2,..., N are connected via signal lines within 1200 m. System 1 includes disaster prevention lighting terminals T1-1, T1-2, ..., T1-i, system 2 includes disaster prevention lighting terminals T2-1, T2-2, ..., T2-j, and system n includes disaster prevention lighting terminals. Tn-1, Tn-2, ..., Tn-m are included. By adopting such a configuration, the maximum wiring length for each system is restricted by the RS485 standard. However, in the entire system, the wiring length is n times that when a signal line is routed in one system, and the signal line is routed. Constraints are improved.

  As shown in FIG. 3, a branch construction terminal board T is provided in the control panel B so that signal lines from a plurality of systems 1, 2,. In the figure, P is a circuit board, which is a printed wiring board on which a circuit as shown in FIG. 1 is mounted. C is a cover, and when branching is performed, the cover C is opened and signal lines are connected to the respective systems 1, 2,..., N.

  As shown in FIG. 1, the circuit configuration in the control panel, which is the branching source of the signal line connected to each system, is a configuration in which RS485 drivers D1, D2,. In this circuit configuration, a plurality of RS485 drivers D1, D2,..., Dn are installed for each system, but the microcomputer M is configured to share one set of serial ports. With this configuration, for example, when transmitting a signal from the control panel B, each RS485 driver is enabled for transmission from one DE / RE port of the microcomputer M, and then the signal is output from the TxD port. By doing so, each RS485 driver can be driven and a signal can be transmitted to all the systems.

  When receiving in reverse, if the disaster prevention lighting terminals such as each guide light transmit at the same time, even the driver can receive, but the signal collides between the driver and the microcomputer and it will not be able to receive, but any one terminal If it is a signal only from, it can be received reliably. Therefore, a polling system is adopted in which the control panel B manages the token (communication right) so that the signals do not collide reliably.

  That is, each disaster prevention lighting terminal T1-1, T1-2, ..., T1-i, T2-1, T2-2, ..., T1-j, Tn-1, Tn-2, ..., Tn-m respectively. Individual addresses 1-1, 1-2,..., 1-i, 2-1, 2-2,..., 1-j, n-1, n-2,. From the control panel B, a signal is transmitted to the terminal Tx-y having a specific address xy, and only the terminal Tx-y that has received the signal can transmit the signal. Only one terminal can send signals. By adopting such a configuration, there is no need to prepare as many serial ports as the number of systems, so there is a problem of dealing with microcomputers with many serial ports or using several microcomputers when the number of serial ports is insufficient It will be resolved.

  In addition, although it does not show in particular about the structure of the disaster prevention lighting terminal Tx-y, it is a disaster prevention illumination device such as a guide light having a communication function, and is equipped with an RS485 driver connected to a signal line. High impedance state). When a signal for the terminal Tx-y of the specific address xy is received from the control panel B, the transmission is enabled, and a signal for monitoring its own state is transmitted to the control panel B. For example, it checks its own state (lamp out, battery exhausted, etc.) based on the received inspection command, and transmits the inspection result to the control panel B. When this transmission is completed, the terminal loses the communication right, enters the reception state again, and waits for a signal transmitted from the control panel B.

  FIG. 4 is an explanatory view showing Embodiment 1 of the present invention. In this embodiment, when the wiring of the system is routed using the configuration described with reference to FIGS. 1 to 3, each system is wired corresponding to the fire prevention section. By doing in this way, the hole provided in a fire wall can be eliminated, or a signal line can be routed only by the minimum drilling construction.

  FIG. 5 is an explanatory view showing Embodiment 2 of the present invention. In the present embodiment, when the wiring of the system is routed using the configuration described with reference to FIGS. 1 to 3, the wiring of each system is routed on a floor basis. By doing so, the wiring length of one system can be reduced when the signal lines are routed. Moreover, since the system is divided in units of floors, management becomes easy.

  The present invention can be applied to applications that monitor the status of emergency lighting equipment such as guide lights, check whether they operate normally in the event of a disaster, and monitor the results and status from another control panel on the network. .

It is a circuit diagram which shows the communication circuit structure of the control board of this invention. It is a circuit diagram which shows the example of wiring of the whole network of this invention. It is a front view of the state which opened the cover of the control panel of this invention. It is explanatory drawing which shows the example of routing of the wiring corresponding to the fire prevention zone of this invention. It is explanatory drawing which shows the example of routing of the wiring corresponding to each floor of this invention. It is a circuit diagram which shows the example of wiring of the whole network of a prior art example.

Explanation of symbols

D1, D2,..., Dn RS485 driver TxD serial data transmission port RxD serial data reception port DE / RE transmission enable control port M microcomputer G AND gate B control panel T branch construction terminal board P circuit board C cover T1-1,. , Tn-m Disaster prevention lighting terminal

Claims (1)

It consists of a disaster prevention lighting terminal such as a guide light having a communication function, and a control panel having a microcomputer that connects these disaster prevention lighting terminals to the network to monitor the status of each terminal and transmit inspection commands. It is a monitoring system for disaster prevention lighting that uses the communication method of RS485 as a physical layer, using the polling method for the communication protocol between the control panel and each disaster prevention lighting terminal, the control panel manages the token of the polling method, Each disaster prevention lighting terminal is configured to send and receive status monitoring / inspection instructions, etc., and a plurality of RS485 drivers are driven by one set of serial ports among the microcomputer ports in the control panel. Send port, serial data receive port, and RS485 driver that is always in the receive state. Disaster lighting monitoring system characterized in that a combination of transmission enable control port to switch the state.

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