JPS62144437A - Data transmission equipment utilizing fire alarm system - Google Patents

Abstract

PURPOSE:To send a data between terminal equipments via the line of a sensor by providing a data light transmission/reception section at the sensor side and a data light transmission/reception section at the terminal equipment side and connecting a fire sensor with the terminal equipment such as a microcomputer optically. CONSTITUTION:In sending a data from the terminal equipment at the side of the fire sensor 5a to the terminal equipment at the side of the fire sensor 5, the transmission data is sent optically to the data light transmission/reception section 6a at the side of sensor under the control of a CPU 9a of the data light transmission/reception section at the side of the terminal equipment. The data inputted to a photodetection section 6a is inputted to the data light transmission/reception section 6n of the fire sensor 5n via sensor lines 3a, 3b and a data light is sent to the data light transmission/reception section 7n at the terminal equipment side. Then the data light received by the light transmission/reception section 7n is subjected to prescribed data processing via an input/output device 8n for transmission and a CPU 9n. Thus, the data is sent among the terminal equipments via the sensor lines 3a, 3b.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention uses a sensor line of a fire alarm system as a transmission line to transmit data between terminals near the sensor or between terminals on the receiving board side. This invention relates to a data transmission device using a fire alarm system.

(Prior Art) In recent years, with the spread of office automation, there has been an increasing need to construct a so-called local area network that performs data communication between a plurality of terminal devices installed in the same building, for example.

(Problems to be Solved by the Invention) However, when constructing a data network for inter-terminal communication in an existing building, etc., it is necessary to lay new signal lines, which makes the installation work difficult.

Therefore, it is possible to use power lines as existing signal lines, but power lines have a lot of noise, so it is difficult to use them as data transmission lines.To avoid noise, transmission data should be Transmission began to be modulated using a carrier wave, and in local area networks with short transmission distances, the modem (modem and demodulator) became complicated and difficult to implement due to cost considerations.

(Means for Solving the Problems) The present invention was made in view of such conventional problems.In existing buildings, the detector line of the fire alarm system is usually connected to each room. By optically coupling the sensor and a terminal device such as a microcomputer, it is possible to transmit data between the terminals via the sensor line. The purpose of this invention is to provide a data transmission device that utilizes a fire alarm system.

In order to achieve this objective, the present invention provides an alarm for any sensor connected to a pair of sensor lines drawn out from the fire receiving panel, which lights up when a fire is detected, and transmits a signal from the sensor line. A data transmitting/receiving section on the sensor side is provided, which is driven to emit light by data, receives external data light, and sends the received light data to the sensor line, and is optically opposed to the data transmitting/receiving section on the sensor side. A terminal side data transmitting/receiving section is provided which is driven to emit light by transmission data from the terminal device and emits data light to the sensor side, and also receives data light from the sensor side and inputs it to the terminal device. It is something.

(Example) FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

First, to explain Mizonari, numeral 1 is a fire receiving board, which has a built-in fire receiving circuit 2, and from the fire receiving board 1, a pair of detector lines 3a and 3b, which serve as power and signal lines, are led out to the warning area. Yes, sensor line 3a.

A terminating resistor 4 is connected to the terminal end of 3b, and a plurality of fire detectors 5a to 5n are connected in parallel for each warning area.

In the data transmission device of the present invention for such a fire alarm system, first, the sensor bases of the fire detectors 5a to 50 installed in the warning area are connected to terminal devices such as microcomputer systems. Sensor-side data transmitting/receiving sections 68 to 6[1] for optically transmitting and receiving data between
will be established. The sensor side data transmitting/receiving sections 68 to 6n are
A light-emitting element for transmitting data and a light-receiving element for receiving data are provided on the outside of the sensor base. Of these, the light-emitting element for transmitting data is a light emitting element that is turned on when a fire is detected by the fire detectors 5a to 5n. It also functions as an information indicator light.

Since the fire detectors 5a to 5n are usually installed on the ceiling surface, the terminal side data transmitting/receiving units 7a to 7n are installed near the fire detectors at optically opposed positions, and the terminal side data transmitting/receiving units 7a to 7n Each of them is a sensor side data transmitting/receiving section 6a~
6n, it is equipped with a light emitting element for transmitting data and a light receiving element for receiving data, and the sensor side data transmitting/receiving parts 6a to 6n.
Data light is sent and received for data transmission between the two.

Each of the terminal-side data transmitting/receiving units 7a to 7n is connected to a transmission input/output device 88 to 8n, and performs serial data input/output processing for data transmission and reception with the CPUs 9a to 9n, which are central devices on the terminal side. Let's do it. External input/output devices 10a to 10n are connected to each of the CPUs 9a to 9n,
The external input/output devices 10a to 1oll include a CRT printer used in a terminal device consisting of a microcomputer system,
In addition to being connected to data input/output devices such as a keyboard, it is also connected to sensors that detect indoor environmental conditions such as a temperature sensor and a humidity sensor.

On the other hand, the fire receiving panel 1 is provided with a data transmitting photocoupler 11 and a data receiving photocoupler 12 in order to transmit data from the fire receiving panel 1 side through the detector lines 3a and 3b. Photocoupler 11.1
2 is connected to a transmission input/output bag @13 in a terminal device such as a microcomputer system installed on the side of the fire reception panel 1, and the transmission input/output device 13 converts parallel data to serial data with the CPU 14. and sensor line 3
Performs data transmission with the a and 3b sides. The CPU 14 is connected to a CRTl 6 and a printer 17 via an external input/output device @15.
Furthermore, external devices such as a keyboard 18 are connected.

FIG. 2 is a circuit diagram showing a specific circuit configuration of the data transmitting photocoupler 11 and the data receiving photocoupler 12 provided in the fire receiving panel 1 together with the fire receiving circuit 2. As shown in FIG.

In FIG. 2, the data transmitting photocoupler 11 includes a light emitting diode 11a and a phototransistor 11b, and connects the light emitting diode 11a to the data input/output device 13 on the terminal side to transmit data according to the pulse code of the transmitted data. It is driven to emit light. The phototransistor 1'lb is connected in series via a resistor 20 between the signal lines 1a and 1b in the fire reception panel 1 for the connection terminals 19a and 19b of the sensor lines 3a and 3b, and receives data light from the light emitting diode 11a. Upon receiving the light, a line current for data transmission determined by a resistor 20 is caused to flow through the sensor lines 3a and 3b.

The data receiving photocoupler 12 includes a light emitting diode 12a and a phototransistor 12b, and by connecting the light emitting diode 12a between the signal lines 1a and 1b via a DC cut capacitor 21, the sensor line 3a,
The data light from the light emitting diode 12a is driven to emit light according to the data transmission line current flowing through the light emitting diode 12a.
The light is received by the transistor 12b and output to the transmission input/output device 13 on the terminal device side.

On the other hand, the fire receiving circuit 2 side is connected via a choke coil 22 for cutting AC components, and is connected to the sensor line 3a when a fire is detected by the fire detector.

The DC alarm current flowing through 3b is connected to resistors 23, 24゜25
and a current detection circuit consisting of a transistor 26, and when the transistor 26 is turned on, a receiving relay 27 is activated,
A relay contact of the receiving relay 27 operates an alarm circuit section (not shown) to display a fire alarm.

Here, since the fire reception circuit 2 is AC-isolated from the photocouplers 11 and 12 for data transmission and reception by the connection of the choke coil 22, a pulse current for data transmission flows through the detector lines 3a and 3b. On the other hand, since the photocoupler 12 for data reception is isolated from the sensor line side in terms of direct current by the capacitor 21, the fire detection operation is not carried out when the fire detector is activated. Even if the alarm current flows, the light emission is not driven by this alarm current, but is driven to emit light only by the pulse current for data transmission.

Figure 3 shows the specific circuit configuration of the sensor-side data transmitting/receiving unit provided on the sensor side in Figure 1 and the terminal-side data transmitting/receiving unit installed near the sensor optically facing each other. The circuit diagram shown is shown below.

First, the sensor side data transmitting/receiving section 6 has a parallel circuit of a resistor 29 and a light emitting diode 30 connected in series with the sensor contact 28, and only passes current pulses for data transmission in parallel with the sensor contact 28. A capacitor 31 is connected thereto. Therefore, current pulses caused by data transmission flowing through the sensor lines 3a and 3b flow through the capacitor 31 to the resistor 29 and the light emitting diode 30, and the light emitting diode 30 is driven to emit light in accordance with the transmitted data. On the other hand, when the sensor contact 28 closes due to fire detection, an alarm current flows through the sensor line, and the voltage output of the resistor 29 due to the alarm current causes the light emitting diode 30 to light up each time the sensor contact 28 is closed. Therefore, the light emitting diode 30 has a function as an alarm indicator light in addition to a function as a light emitting element for transmitting data.

Further, in the data transmitting/receiving section 6 on the sensor side, a phototransistor 32 for receiving data light from the terminal side is provided via a current limiting resistor 34 for distinguishing between a fire alarm current and a data current. The transistor 32 is connected between the connection terminals of the sensor to the sensor lines 3a, 3b,
A light receiving current corresponding to the data light is sent to the sensor lines 3a and 3b.

On the other hand, the light emitting diode 30 of the data transmitting/receiving section 6 on the sensor side
The terminal-side data transmitting/receiving section 7, which is disposed at a position optically facing the phototransistor 32, is provided with a light emitting diode 33 for transmitting data and a phototransistor 34 for receiving data. 34 is connected to the transmission input/output device in the terminal device on the sensor side shown in FIG.

Next, the operation of the above embodiment will be explained.

First, a transmission code used for data transmission between terminal devices has a frame structure consisting of a start pulse, address information indicating a transmission destination, transmission data, and an end pulse.

For example, from the terminal device on the fire detector 5a side to the fire detector 5
Taking data transmission to the n-side terminal device as an example, CPU9
After the transmission control by a, the appropriate transmission data obtained via the external input/output device 10a is sent as serial data by the transmission input/output device 8a by specifying the address information of the terminal device on the side of the fire detector 5n, which is the destination. and outputs it to the terminal side data transmitting/receiving section 7a. Terminal side data transmitting/receiving section 7a
As shown in FIG. 3, the light emitting diode 33 is provided with a light emitting diode 33 for transmitting data, so that the light emitting diode 33 is driven to emit light at the timing of the pulse bit "1" of the serial transmission data transmitted from the transmission input/output device 8a. Then, the data light is sent to the sensor-side data transmitting/receiving section 6a provided on the sensor base of the fire detector 5a. As shown in FIG. 3, the sensor side data transmitting/receiving section 6a includes a phototransistor 32 for receiving data light, so that the phototransistor 32 receives data light from the terminal side and responds to the received light pulse. The pulsed current is sent to the sensor lines 3a, 3.
Flow to b.

In response to the pulse current for data transmission flowing through the sensor lines 3a and 3b, the light emitting diode 30 (third (see figure) is driven to emit light and sends data light to the terminal side data transmitting/receiving sections 7a to 7n. The data light received by the terminal side data transmitting/receiving sections 7a to 7n is transmitted as serial reception data to the transmission input/output devices 8a to 8.
n, and when the transmission input/output devices 8a to 8n finish receiving data for one frame, the data is output as parallel data to the CPUs 9a to 9n. The CPUs 9a to 9n determine the address of the received data, take in the transmission data that determines their own address, and perform predetermined data processing. At this time, since the address specifies the terminal device on the fire detector 5n side, the CPU 9n begins to process the transmission data sent from the terminal device on the fire detector 5a side based on its own address determination. .

Such data transmission between terminal devices is carried out in the same way not only on the detector side but also with the terminal device provided on the fire receiving board 1 side.

Note that when a plurality of terminal devices are connected to the sensor lines 3a and 3b as shown in FIG. 1, if two or more terminal devices transmit data at the same time, the sensor line 3a.

3b, causing a data collision and a transmission error. Therefore, the CPUs 9a to 9n and 14 in each terminal device constantly check whether or not data light is received from the sensor line side. By performing transmission processing that prohibits data transmission when data light is being received and allows data transmission when data light is no longer received, it is possible to avoid transmission errors due to data collisions.

Furthermore, the embodiment shown in FIG. 1 is an example of data transmission between terminals using one detector line drawn out from the fire receiving board 1. In such a case, in order to enable data transmission between the sensor lines, each sensor line is connected to an AC filter circuit in the fire receiving panel 1. It would be better to combine them.

Further, in the above embodiment, the alarm indicator light of the sensor and the light emitting element for data transmission are shared, but they may be provided independently.

(Effects of the Invention) As described above, according to the present invention, when a fire is detected, an alarm is lit on any sensor connected to a pair of sensor lines drawn out from the fire receiving panel, and the sensor A data transmitting/receiving section on the sensor side is provided, which is driven to emit light by data transmitted from the line, receives data light from the outside, and sends the received light data to the sensor line; A terminal that is optically opposed and driven to emit light by transmission data from a terminal device such as a microcomputer system, emits data light to a sensor side, and also receives data light from the sensor side and inputs it to the terminal device. Since a side data transmitting/receiving section is installed, data can be transmitted between terminals using the detector line of the fire alarm system already installed as a data transmission line even in existing buildings, etc., and new signals can be transmitted. Since there is no need to install wires, data transmission networks for office automation can be easily constructed.

In addition, since the alarm indicator light already installed in the fire alarm is used as a light emitting element to send data light to the terminal side, a new light receiving element for receiving data light is added to the detector side. Optical data transmission and reception can be performed between the fire detector and the terminal device, and data can be transmitted using the detector line with only a few changes to the fire detector.

Furthermore, under normal monitoring conditions, the detector line is only supplied with a constant DC power supply voltage from the fire receiving panel, so there is almost no fluctuation in the line potential compared to power lines, etc., and it is stable. Transmission quality can be guaranteed.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Fig. 2 is a circuit diagram showing an embodiment of the fire receiving panel side circuit of Fig. 1, and Fig. 3 is an explanatory diagram showing an embodiment of the present invention.
The figure is a circuit diagram showing an embodiment of the sensor side circuit. 1: Fire receiving panel 2: Fire receiving circuit 3a, 3b: Detector line 4: Terminal resistor 5a to 5n: Fire detector 6.6a to 6n: Sensor side data transmitting/receiving section 7.7a to 7
n: Terminal side data transmitting/receiving unit 8a to 8n, 13: Transmission input/output device 9a to 9n, 14: CPU 10a to 10n, 15: External input/output device 11: Data transmission photocoupler 12: Data reception photocoupler 11a, 12a, 30, 33: Light emitting diode 1 lb
, 12b, 32.34: Photo 1 to transistor 22:
Choke coil 27: Fire reception relay 28: Sensor contact

Claims (2)

[Claims] (1) When a fire is detected, a sensor connected in parallel to a pair of sensor lines drawn out from the fire receiving board lights up to signal the alarm and is driven to emit light by data transmitted from the sensor line.
In addition, a sensor side data transmitting/receiving section is provided which receives data light from the outside and sends it as transmission data to the sensor line, and optically opposes the sensor side data transmitting/receiving section and transmits the transmitted data from the terminal device. a terminal side data transmitting/receiving section that converts the data into data light and emits it to the sensor side, and receives the data light from the sensor side and inputs it to the terminal device. A data transmission device using (2) A data transmitting/receiving means for optically transmitting and receiving data with the detector line is provided on the fire receiving panel side, and the detector line is used between the detector side terminal and the receiving panel side terminal. A data transmission device using the fire alarm system according to claim 1, which transmits data.