JPH069071B2 - Fire alarm system repeater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a repeater of a fire alarm system using multiplex transmission.

[Background technology]

Conventionally, a repeater of this type of fire alarm system used a relay and the like for the purpose of isolating the multiplex transmission system from the line side, but there was the problem that the configuration became large and noise was easy to ride. .

[Object of the Invention]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a repeater for a fire alarm system, which has a simple structure, is less likely to receive noise, and can be further downsized. .

[Disclosure of Invention]

FIG. 1 shows an overall schematic configuration diagram of a fire alarm system used in the present invention. In the figure, (1) is a receiver, (2) is a repeater,
(3) is a fire detector connected to the line l ₁ ... Connected to the repeater (2). The receiver (1) transmits the first clock pulse CP1 and the second clock pulse CP2 to each repeater (3) through different transmission lines, and also the address data corresponding to the address assigned to each repeater (2). Further, the control data is transmitted to the repeaters (2) by time division multiplexing in synchronization with the clock pulses CP1 and CP2 through another transmission line, while the repeaters (2) are When the address data corresponding to its own address is received, the control data sent after the address data is taken in, and the repeater self-checks or is connected at a predetermined timing based on the control data. line l 1 _... continuity test, together with performing various controls concerned devices recovery, etc., Serufuchietsuku confirmation data, the fire alarm signal from the continuity test data and the fire detector (3) And summer to return to the receiver (1) In yet another transmission line respectively of the signal at a predetermined timing if Re. The receiver (1) discriminates the return signal from the repeater (2) and determines the repeater (2).
Or, normality / abnormality of the line l ₁ ... Is discriminated, or an alarm is issued when a fire alarm signal is received from the fire detector (3) connected to the repeater (2). To do. In FIG. 1, (4) is a terminating capacitor connected to the end of each line l _1, ... And (5) is a transmission line composed of each transmission line. 2 (a) to 2 (d) show the format of the signal used in the fire alarm system of the present invention. FIG. 2 (a) shows the first clock pulse CP1, and the first clock pulse CP1 is 16th to 16th. Each serial pulse is transmitted as a group at regular intervals corresponding to each repeater (3). FIG. 7B shows the second clock pulse CP2, and the second clock pulse CP2
Are continuously transmitted in a phase shifted by 180 degrees with respect to the phase of the first clock pulse CP1 and in the same cycle. FIG. 7C shows a data signal, which is composed of a 16-bit pulse group transmitted from the receiver (1) in synchronization with the first clock pulse CP1 and the second clock pulse CP2, of which 8 bits are the repeater (2). Address data, and the remaining 8 bits constitute control data.
If each bit is "H", for example, the logical value "1",
If it is "L", it indicates a logical value "O", and if the 9th and 13th bits in the control data are "H", it constitutes a control command bit for commanding control to the repeater (3). , The tenth is the continuity test command bit of the first line l ₁ ,
Eleventh is the sensor recovery command bit of the first line l ₁ .
12th second continuity test instruction beat line l _2, 14th of 2 lines l ₂ sensor recovery command bits, the first
The fifth is the continuity test command bit of the _third line l ₃ , the 16th
The third one constitutes the sensor recovery command bit of the third line l ₃ , that is, three lines l for one repeater (2).
_{1 ...} are connected, the first control per control each for the lines l 1 _... is the so performed, are assigned a signal of 1 bit. In the figure, (d) shows the return signal RP. In this return signal RP, each bit of information is transmitted in response to the 9th to 16th data signal pulses, and the first and the fifth pulse Serufuchietsuku use logic IC in the transponder (2) information, the second pulse is the first information fire alarm line l _1, 3-th pulse of the first line l ₁ Confirmation information of continuity test, 4th pulse is fire alarm information of the second line l ₂ , 6th pulse is confirmation information of continuity test of the second line l ₂ , 7th pulse is 3rd information fire alarm line l ₃ of the eighth pulse is the confirmation information continuity test of the third line l ₃ respectively responsible.

FIG. 3 shows a circuit block of the repeater (2).
a) is a line signal conversion circuit that receives the multiplex transmission signal from the receiver (1) and converts it into a line signal, and (2b ₁ ) ... Is a line l ₁ ... provided corresponding to each line l ₁ ... And the line signal conversion circuit (2a).

FIG. 4 shows a specific circuit of the repeater (2).
C ₁ and IC ₂ are dedicated ICs that respectively configure the line signal conversion circuit (2a), and as shown in FIG. 5, set addresses of the address setting unit (6 ₁ ) composed of the display switch DS ₁ and data. An address comparison / judgment function unit (6 ₂ ) for making a comparison judgment with the address data sent as the signal DP, and a control data judgment function unit (6 ₃ ) for making a reception judgment of the control data and generating a predetermined signal. , fire alarm signal, return signal generation function unit for receiving a confirmation signal continuity test to create a predetermined return signal RP (6 _4), the I
A self-check function unit (6 ₅ ) which performs self-check of C itself and sends confirmation information of the self-check to the return signal creation function unit (6 ₄ ) to create a return signal RP.
And both clock pulses CP1 and CP2 are received to receive the data signal DP at a predetermined timing,
And a timing control function unit (6 ₆ ) that determines the timing for generating the return signal RP.
The _first terminal of C ₁ and IC ₂ is a terminal that outputs a return signal,
The second, third, and fourth terminals are the first clock pulse CP1 and the second
The terminal for inputting the clock pulse CP2 and the pulse of the data signal DP, and the terminals 8 and 9 of the IC ₁ are the data signal D.
A terminal for generating a signal corresponding to the 10th bit of P, and terminals 10 and 11 are 11ths of the data signal DP.
Connect the terminal that generates the signal corresponding to the th bit to 1
The 3rd and 14th terminals are terminals for generating a signal corresponding to the 12th bit of the data signal DP, and 8 of IC ₂ ,
The 9th terminal is the terminal for generating the signal corresponding to the 14th bit, and the 10th and 11th terminals are the data signal 1
A terminal for generating a signal corresponding to the fifth bit is further configured, and terminals 13 and 14 are terminals for generating a signal corresponding to the 16th bit of the data signal DP, respectively.
The input terminal of the terminal address setting data 15 to 22 No. of the _IC 1, IC _2, also 5 No. IC _1, the sixth pin is first fire alarm signal line _{l 1,} confirm the continuity test Signal input terminals, IC ₁ 's No. 7 and IC ₂ 's No. 5 terminals are input terminals for fire alarm signal and continuity test confirmation signal of the second line l ₂ , and further IC ₂ 's No. 6 and 7 turn the pin fire alarm signal of the third line l _3, and the input terminal of the check signal continuity test with each configuration. Also, IC ₁ and IC ₂ are set so that signal conversion operation for control and return is performed corresponding to the first control bit when the 23rd terminal is "H" and the second when it is "L". The 23rd terminal of ₁ is "H", I
The 23rd terminal of C ₂ is “L”, and the input / output allocation of the signal of each terminal as described above is set. The 24th and 12th terminals are a power source and a connection terminal. LA _{1 to} L
A ₃ is a latch circuit, and these latch circuits LA ₁
To LA ₃ are RS latch ICs ₃ and ICs as shown in FIG.
₄ and OR gate IC ₅ , each IC
_1. The control signal from IC ₂ is latched. IC ₆ and IC ₇ are the respective latch circuits LA ₁
Output signals from ～LA ₃ circuit _(2b 1) ~ ₍₂
b ₃ ) is an IC that constitutes a transistor array for relaying. The input / output circuits (2b ₁ ) to (2b ₃ ) have the same circuit configuration, and of the pair of terminals L and C ₀ connecting the lines l _{1 to} l ₃ , respectively, the terminal C ₀ is commonly connected. The terminal L is connected to the negative line of the 24V power source E ₁ , and the terminal L is connected to the 2 through the resistor R ₁ and the switching transistor Tr _1.
It is connected to the + line of the 4V power supply E ₁ . A photo coupler PH is provided at the base of the switching transistor Tr _1.
1 is connected to be turned on by the output of the off-coupler PH ₁ . Photo coupler PH ₁
Is turned off by the signal F of "H" level generated from the transistor array IC ₆ or IC ₇ during the recovery control or the continuity test. Between the terminals L and C ₀ , the output side of the photo coupler PH ₂ and the provided R ₂ Zener diode ZD
Zener diode ZD by connecting ₁ and series circuit
₁ is connected to the base of the transistor Tr ₂ via a time constant circuit composed of a resistor R ₃ and a capacitor C ₁ .
That is, the transistor Tr ₂ is turned on when the photocoupler PH ₂ is turned on and the voltage across the capacitor C ₁ reaches a predetermined level. This transistor Tr ₂ is P
NP type are connected transistor through the input side of the resistor between Besuemitsuta of Tr _{3 R 4} and _{R 5} and Fuotokapura PH _3, Fuotokapura PH to turn on the transistor Tr ₃ and when on passing a base current of the transistor Tr _{3 3} is turned on. The photocoupler PH ₂ is turned on when the signal E generated from the transistor array IC ₆ or IC ₇ during the continuity test becomes “H”. Further, the photo coupler PH ₃ has its output connected to a predetermined (sixth of IC _{1 in} the embodiment circuit) input terminal of the line signal conversion circuit (2a) as a confirmation signal of a conduction signal. The above resistor R ₁ at both ends is connected to the input side of the Fuotokapura PH _4, the terminal L, C ₀ during a short circuit condition, i.e. in a state where the fire detector (3) is activated, the resistance R _1, when to quenching transistor Tr ₁ When a large current flows through the resistor R ₁ , the photo coupler PH ₄ connecting the input side to the resistor R ₁ is turned on, and the output side is connected to a predetermined input terminal (fifth of IC ₁ ) of the line signal conversion circuit (2a). An output signal is sent as a fire alarm signal. Of course, if a predetermined number or less of fire detectors (3) are connected to one line, the voltage generated across the resistor R ₁ due to the current flowing through the normal fire detector (3) is applied to the photocoupler PH ₄ . Since the voltage can be suppressed below the operating voltage, no malfunction occurs during normal warning, and no fire alarm signal is naturally generated.

Next, the operation of the fire alarm system of the present invention will be described.

First, in a normal alert state, CP1 of the first clock pulse and CP2 of the second clock pulse CP2 shown in FIGS. 7 (a) and 7 (b).
At the same time, the address data shown in FIG. 7 (c) and the data signal DP with the 9th and 13th control command bits set to the "H" level are received cyclically via the transmission line (5) to the repeater (2). Machine (1). In the repeater (2), IC ₁ , IC _{2 of the} line signal conversion circuit (2a)
At the time of calling its own address, the control data sent next to the address data is taken in. The IC ₁ sends the result of the self-check when receiving the first control command bit as the signal of the first bit of the return signal RP shown in FIG. 7D, and when receiving the second control command bit, the self-check is performed. The result of the check is sent as the signal of the fifth bit of the return signal RP. At this time, "H" level means abnormal, and "L" level means normal. Now, if _one of the fire detectors (3) connected to the line l ₁ detects a fire and the line l ₁ is short-circuited, the resistor R ₁ and the switching transistor Tr in the input / output circuit (2b ₁ ) are connected. ₁ through which a large current flows and the voltage across the resistor R ₁ causes the photocoupler P to
The light emitting diode provided on the input side of H ₄ is caused to emit light, and the phototransistor provided on the output side of the photo coupler PH ₄ is turned on to set the signal G to the “L” level, and the fifth terminal of the IC ₁ is set to the “L” level. Then, a fire warning signal will be input to IC ₁ . Therefore, the IC ₁ returns the return signal R corresponding to the fire alarm signal of the line l ₁ as shown in FIG. 7 (d).
The second bit of P is set to "H" level and the receiver (1)
The information of fire occurrence is transmitted to. Receiver (1)
Then, each bit of the return signal RP is determined, and if the bit corresponding to the self-check is "L" as described above, it is determined that the IC ₁ and IC ₂ built in the repeater (2) of the address are normal. If the bit corresponding to the information on the occurrence of fire is at "H" level, a predetermined fire alarm signal (3) connected to the repeater (2) of the address, for example, the circuit l ₁ issues a fire alarm signal. The fire alarm is issued. In addition, (e) to (l) in FIG. 7 indicate the signal levels of A to H in FIG. 4, and the signal of G being “L” level means that a fire warning signal is generated. Show.

Next, the case of conducting the continuity test will be described. First, by designating a repeater (2) for conducting a continuity test on the receiver (1) side and a line of the repeater (2), control corresponding to the continuity test of a predetermined line when the repeater (2) is called. The bit of data is set to "H". In the data signal DP of FIG. 8 (c), the tenth bit corresponding to the continuity test of the line l ₁ is "H". On the other hand, in the IC ₁ of the line signal conversion circuit (2a) of the repeater (2) which receives the data signal DP, the signal A from the 8th terminal is set to "H" at the timing shown in FIG. 8 (e). . The signal F of the transistor array IC ₆ changes from "L" to "H" and the input / output circuit (2
b ₁ ) The light emission current of the light emitting diode of the photocoupler PH ₁ is cut off to turn off the phototransistor on the output side, and the switching transistor Tr ₁ is turned off. When the switching transistor Tr ₁ is turned off, the terminal L is disconnected from the 24V power source E ₁ . Then ₁ of IC 1
When the signal C from the 0th terminal is set to "H" at the timing shown in FIG. 8 (g), the signal E of the transistor array IC ₆ changes from "H" to "L" as shown in FIG. 8 (i). By switching, a light emitting current is passed through the light emitting diode of the photo coupler PH ₂ to turn on the photo transistor on the output side. When this phototransistor is turned on, the charged load of the terminating capacitor (4) of the line l ₁ is discharged through the phototransistor. The discharge by current flows the base current to the transistor Tr ₂ Te summer and the pulse current of several 10 msec, turns on the transistor Tr _2. Turns on the phototransistor on the output side of the Fuotokapura PH ₃ further flowing a light emission current to the light emitting diode of Fuotokapura PH ₃ transistor Tr ₃ is turned on Te cowpea to this one. Therefore, the signal H input to the 6th terminal of IC ₁ becomes "L" as shown in FIG. 8 (l), and the continuity test that the line l ₁ is normal from the repeater (2) is conducted. The "H" level signal, which is the confirmation signal, is returned at the third bit of the return signal RP in FIG. 8 (d). If the line l ₁ is disconnected, the photocoupler PH ₂ does not turn on due to the charging load of the terminating capacitor (4). Therefore, the photocoupler PH ₃
Does not turn on, and accordingly the signal H input to the No. 6 terminal of IC ₁ is in the "H" level state. In this case, the repeater (2) returns the third bit to the "L" level. The signal RP will be returned.

It is ideal that the photocoupler PH ₁ is switched from ON to OFF and then the photocoupler PH ₂ is switched from OFF to ON, but this is not the case and both ON states occur, and the termination capacitor (4) is not connected. A pulse current of several msec flows through the photocoupler PH _{2 and the} transistor Tr
₂ and Tr ₃ may turn on, so the capacitor C ₁
Absorbs a pulse current of a very short width of a few msec.
The transistors Tr ₂ and Tr ₃ are prevented from being turned on. The signals shown in FIGS. 8 (a) to (l) correspond to the signals shown in FIGS. 7 (a) to (l).

Now, the receiver (1) commands the continuity test, and if the signal of the predetermined bit of the return signal RP corresponding thereto is "H", it is judged that the line is normal, and conversely, if it is "L", the line is judged to be normal. It is determined that there is a wire breakage in the receiver, and if there is a wire breakage, the display is provided by the display means provided in the receiver (1).

By the way, when the fire detector (3) of the concerned line is restored after the fire detector (3) has operated, the address data of the prescribed repeater (2) and the restoration instruction of the concerned line are issued as in the continuity test. The control data with the bit corresponding to "H" set to "H" may be transmitted from the receiver (1) when calling the relay (2) of the address. Here, as shown in FIG. 9 (c), when the control data for instructing the restoration of the line l ₁ is transmitted to the receiver (1), the IC ₁ of the repeater (2) becomes 11
The "H" level signal C is output to the latch circuit LA ₁ from the No. terminal at the timing shown in FIG. 9 (g) to change the signal F of the transistor array IC ₆ from "L" to "H" level. In other words, with this changed timing, the photocoupler PH ₁ is turned from ON to OFF, so that the switching transistor Tr ₁ is turned OFF and the 24V power supply E ₁ is disconnected from the line l ₁ . That is + 24V to the fire detector (3)
When the power supply E ₁ is not supplied, the fire detector (3) will be restored. The signals shown in FIGS. 9 (a) to 9 (l) also correspond to the signals shown in FIGS. 7 (a) to 7 (l).

Above in the present invention the fire system as, repeaters each input-output circuit _(2b 1) of (2) ~ (2b ₃₎ connected to the to the line _{l 1,} l 2, _{l 3} receiver relative to (1) It is possible to issue a continuity test command and a restoration command from the side, receive fire occurrence information from each of the lines l ₁ , l ₂ , and l ₃ , check information of the continuity test, and self-check information of the repeater (2). Can be received as a return signal RP, and 16
By using 8 bits of the bit data signal DP, three lines l ₁ , l for one repeater (2)
It made it possible to connect _{2, l 3.}

〔The invention's effect〕

INDUSTRIAL APPLICABILITY The present invention, in the repeater used in the fire alarm system configured as described above, creates a command signal such as a continuity test of a line or a restoration of a fire detector connected to the line, and a fire detector connected to the line. A line signal conversion circuit that creates a return signal to be returned to the receiver by a fire alarm signal from the side,
A means for receiving a fire alarm signal from a fire detector connected to the line, a circuit for restoring the line by each command signal, or a control means for conducting the line and a means for generating a signal for confirming the line continuity. Since an output circuit is provided and a signal is transmitted between the line signal conversion circuit and the input / output circuit using a photo coupler, a 24V power source on the line side,
Isolation with the 12V power supply of the multiplex transmission system can be performed without using a relay as in the conventional case, and therefore there is little risk of noise being added, and the configuration is simple, cost is reduced and reliability is high. There is an effect that the size can be improved and the size can be reduced. In addition, the present invention uses a photocoupler that turns on when the voltage across a resistor inserted between the power supply to the line and the line becomes a certain level or higher, and fires from the output side of the photocoupler. Since the alarm signal is sent to the line signal conversion circuit, the multiplex transmission system and the sensor signal transmission system can be insulated and separated, and noise from the sensor signal transmission system line, lightning surge, etc. The effect of does not affect the multiplex transmission system, and the photocoupler uses a photocoupler that turns on when the voltage across the resistor inserted between the power supply supplied to the line and the line exceeds a certain level. Since the fire alarm signal is sent from the output side of the photocoupler to the line signal conversion circuit, the increase in the line current when the line is short-circuited due to the alarm operation of the detector is directly linked to the ON operation of the photocoupler. It also has a signal detection function that converts the signal to the line signal transmission system and transfers the signal to the multiplex transmission system, so there is no need to use a comparator, and multiplex transmission as described above at the same cost as when using a comparator. There is the effect of two birds with one stone that the effect due to the insulation separation of the system and the transmission system of the sensor signal can also be obtained.

In addition, a 24V system usually consumes a large amount of current and a 12V system CO has a large voltage drop between the receiver and the repeater, compared to a line transmission system.
Receiver that uses MSIC and consumes less current.
By insulating and separating the multiplex transmission system having a small voltage drop between the repeaters as described above, it is possible to prevent the influence of the voltage drop of the line transmission system from reaching the multiplex transmission system.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of the fire system of the present invention, and FIG.
FIG. 4 is an explanatory view of the format of the transmission signal of the above, FIG. 3 is a circuit block diagram of the repeater of the same, FIG. 4 is a schematic block diagram of the line signal conversion circuit of the same, and FIG. 5 is a circuit diagram of the embodiment of the same. FIG. 6 is a circuit diagram of a latch circuit of the above embodiment, FIG.
FIG. 9 to FIG. 9 are diagrams for explaining the operation of the same as above. (1) is a receiver, (2) is a repeater, (3) is a fire detector, (5) is a transmission line, and PH _{1 to} PH ₄ are photocouplers. , CP1 is the first clock pulse, CP2 is the second clock pulse, DP
Is a data signal, RP is a return signal, r ₁ is a switching transistor, Tr ₂ and Tr ₃ are transistors, and l _{1 to} l
₃ is a line.

Claims (3)

[Claims] 1. A receiver transmits a clock pulse and a data signal in which address data and control data are composed of a plurality of serial pulse trains in synchronism with the clock pulse by time division multiplex transmission through separate transmission lines. , When a repeater to which an address is individually assigned receives its own address data, it performs a self-check of the built-in circuit of the repeater based on the control data and a control operation of the continuity test of the line connected to the repeater. The fire occurrence information from the fire detector connected to the, the confirmation information of the continuity test, and the self-check information are time-division multiplexed to the receiver during the control data reception period via a transmission line other than the above transmission line. It is used for transmitting fire system, based on clock pulse and data signal transmitted from the transmission line side, line continuity test,
A line signal that creates a command signal to restore the fire detector connected to the line, and a fire alarm signal from the fire detector connected to the line, and a return signal that is sent back to the receiver by the line continuity signal A conversion circuit and an input / output circuit having control means for performing recovery / restoration and a line continuity test by each command signal and means for generating a line continuity confirmation signal are provided. Signals are sent and received using a photocoupler, which is inserted between the power supply supplied to the line and the line and detects the current that flows when the line is short-circuited by the fire detector.Fire from the output side of the photocoupler connected to the input side. A repeater for a fire alarm system characterized in that an alarm signal is sent to a line signal conversion circuit. 2. A switching transistor is provided between the power supply supplied to the line and the line, and the output side is connected between the base and emitter of the switching transistor,
Provided is a photocoupler whose input side is connected to the line signal conversion circuit side, which is normally turned on, and which is provided with an input / output circuit for receiving a signal from the line signal conversion circuit side so as to turn it off when the fire detector is restored. A repeater of the fire alarm system according to claim 1. 3. A circuit comprising: an output side connected in parallel to a line; and a charge load of a terminating capacitor connected to a line termination when being turned on is given to the switching element as a drive signal for the switching element via the output side. No. 1 photocoupler, a second photocoupler connected to the line through the switching element, and a third photocoupler having an output side connected between the base and emitter of a switching transistor inserted between the line and the power supply. A third photocoupler which is provided with a coupler and which is always turned on by a continuity test command signal from the line signal conversion circuit is turned off, and the first photocoupler is turned on after the turning off, and the first photocoupler is turned on when the switching element is turned on. Two
The relay device of the fire alarm system according to claim 1, further comprising an input / output circuit for supplying the output of the photocoupler as a confirmation signal of the continuity test to the line signal conversion circuit.