JP2733068B2 - Self-fire alarm system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a self-fire alarm system.

[Prior Art] FIG. 4 shows a schematic configuration of a self-fire alarm system of this type. In the conventional self-fire alarm system, as shown in FIG. 5, a start signal ST, an address data signal AD, and a control data signal are provided.
The baseband multiplex transmission signal including the CD, the checksum data CS, the reply period setting signal RP, and the like is transmitted via the transmission line 3 by time division multiplexing in the order of addresses of the respective repeaters 2 to which a unique address is set from the receiver 1. When the repeater 2 determines that its own address has been called by the determination processing function using the CPU or the like, it reads the control data, performs data processing based on the control data, and receives the reply period setting signal RP. During the period, monitoring data of the sensor 4 and the like (for example, analog data such as smoke density) is used as return data, and the data is returned to the receiver 1 as a current mode return signal RD due to a short circuit of the transmission line 3 or the like. It has become.

In addition, the repeater 2 is connected by a line 5 between a terminal including, for example, an analog type sensor 4 having an intelligence function and a unique address and an on / off type sensor 4 ′. A DC voltage is applied to the line 5 and the DC voltage is reduced by a constant voltage at a constant period. During this period, a multiplex transmission signal having a data format equivalent to the above-described multiplex transmission signal is superimposed on the DC voltage by a signal transmission function. And transmits the monitoring data of each of the sensors 4 to the sensor 4 in a time-division multiplex manner, processes the returned monitoring data. 4 'is monitored, and if there is a short circuit in the line 5 during this monitoring period, a fire alarm is determined. Then, the monitoring data and the judgment result of these sensors 4 and 4 'are returned as reply data when data is exchanged with the receiver 1.

[Problem to be Solved by the Invention] In the above-described conventional example, a circuit configuration using a CPU or the like is required to provide the repeater with a function of performing a determination process and a function of performing signal transmission, and as a result, the cost of the repeater is increased. In particular, there is a problem that the cost of the system is high in small and medium-sized systems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object the purpose of having a short circuit in a line, without affecting the transmission line, and in response to each of the transmission line and the line. It is an object of the present invention to provide an automatic fire alarm system that can transmit data in a signal format and can link data between a line system and a transmission system with a relay having a simple configuration.

[Problem to be Solved] The present invention performs transmission and reception of data by a multiplex transmission signal through a transmission line between a receiver and a repeater, and transmits a signal between a terminal such as a sensor and the repeater through a line. In a self-fire alarm system that exchanges data using multiplex transmission signals,
The format of data exchanged between the receiver and the repeater,
The format of data transmitted and received between the terminal and the repeater is the same, and the repeater includes insulating means for insulating between the transmission line and the line, and the receiver and the relay. The signal format of a multiplex transmission signal performing multiplex transmission between devices and the signal format of a multiplex transmission signal performing multiplex transmission between the terminal device and the repeater are converted to a line or a line via the insulating means. It is provided with conversion means for superimposing on the transmission line.

[Operation] In the present invention, however, the transmission line and the line are separated by the insulating means, so that even if a short circuit occurs on the line side, the transmission line side is not electrically affected. Since it only converts the signal format of the transmission line system and the transmission line system to each other, it is possible to transmit the multiplex transmission signal in each specific signal format and to link the data between the transmission line system and the line system, Since processing such as signal judgment is not performed, the configuration of the repeater is simplified.

EXAMPLES The present invention will be described below with reference to examples.

FIG. 1 shows the configuration of the repeater 2 used in the embodiment system.
A line voltage control circuit 6 having a function of reducing Va to a constant voltage Vb during the transmission period of the multiplex transmission signal, and a multiplex transmission signal transmitted from the receiver 1 through the transmission line 3 (the multipole baseband shown in FIG. 2). 3) is converted into a signal format to be superimposed on the applied voltage of the line 5 as shown in FIG. 3, and a return signal returned from the line 5 side is extracted and the multiplexed transmission signal of the receiver 1 side is extracted. A transmission signal conversion circuit 7 for converting a return signal in a current mode during a reception period of the return period setting signal RP, and the line 5 and the transmission line 3 are electrically insulated by an insulating means such as a photocoupler or an insulation transformer. The multiplexed transmission signal converted by the transmission signal conversion circuit 7 is superimposed on the applied voltage 5 through the line voltage control circuit 6, and a return signal input from the line 5 through the line voltage control circuit 6 is extracted and transmitted. Send to To an insulating circuit 8 Prefecture, the line voltage control circuit 6 are provided with a multiple transfer signal detection function of controlling the applied voltage to detect the presence or absence of a multiplex transmission signal extracted by the insulating circuit 8. Here, it is assumed that the data format of the multiplex transmission signal on the transmission line 3 (shown in FIG. 2 and the symbols in FIG. 2 conform to the symbols in FIG. 5) and the data format of the multiplex transmission signal on the line 5 are the same. Therefore, the transmission signal conversion circuit 7 has a function of only converting a signal format into a signal format corresponding to each system. In addition to connecting the intelligence type sensor 4 corresponding to the multiplex transmission signal to the line 5, an on / off type sensor using the DC voltage of the line 5 can be connected. In this case, the on / off type sensor It goes without saying that the repeater 2 is provided with a receiving function for monitoring the alert.

[Effect of the Invention] In the self-fire alarm system configured as described above, the present invention relates to a data format exchanged between a receiver and a repeater,
The format of data transmitted and received between the terminal and the repeater is the same, and the repeater includes insulating means for insulating between the transmission line and the line, and the receiver and the relay. The signal format of a multiplex transmission signal performing multiplex transmission between devices and the signal format of a multiplex transmission signal performing multiplex transmission between the terminal device and the repeater are converted to a line or a line via the insulating means. Since the conversion means for superimposing on the transmission line is provided, the transmission line and the line can be electrically separated by the insulating means, and even if a short circuit occurs on the line side, the transmission line side is electrically affected. There is no effect, so that even if a short circuit occurs on the line side, the operation of the receiver side is not affected and a highly reliable system can be constructed. Just convert to my husband The multiplex transmission signal can be transmitted according to the specific signal format of the above, the data can be linked between the transmission line system and the line system, and furthermore, since the processing such as signal judgment is not performed, the structure of the repeater is simplified, and the system This has the effect of reducing costs.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a repeater used in an embodiment of the present invention,
FIG. 2 is an explanatory diagram of a multiplex transmission signal and data format of the transmission line system of the above, FIG. 3 is an explanatory diagram of a multiplex transmission signal of the above-mentioned line system, FIG. The figure is an explanatory diagram of the data format used in the above. 1 is a receiver, 2 is a repeater, 3 is a transmission line, 4 is a sensor, 5
Is a line, 6 is a line voltage control circuit, 7 is a signal format conversion circuit, and 8 is an insulation circuit.

Claims (1)

(57) [Claims] 1. A multiplex transmission signal is transmitted and received between a receiver and a repeater through a transmission line, and data is transmitted and received by a multiplex transmission signal through a line between a terminal such as a sensor and the repeater. In the self-fire alarm system, the format of data transmitted and received between the receiver and the repeater is the same as the format of data transmitted and received between the terminal and the repeater. Comprises an insulating means for electrically insulating between the transmission line and the line,
A line or a signal format of a multiplex transmission signal performing multiplex transmission between the receiver and the repeater and a signal format of a multiplex transmission signal performing multiplex transmission between the terminal device and the repeater. An automatic fire alarm system comprising a conversion unit for superimposing on a transmission line.