JP3780486B2 - Disaster prevention monitoring system and transmission method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disaster prevention monitoring system and a transmission method for monitoring and controlling an abnormality such as a fire by connecting a plurality of terminal devices to a transmission line drawn from a receiver.
[0002]
[Prior art]
Conventionally, in communication between a disaster prevention monitoring system receiver known as R type and a terminal device, the receiver repeatedly designates the address of the terminal device in order and transmits a calling signal having the terminal address. When a call signal having a terminal address that matches the self address is received, internal processing for transmitting a response signal is started, and a response signal obtained based on the internal processing is transmitted.
[0003]
FIG. 7 is a time chart of transmission processing between a conventional receiver and a terminal device. For example, the receiver 100 sequentially designates the terminal addresses 1 to 127 and transmits the calling signals 104-1, 104-2, 104-3,.
[0004]
The call signal 104-1 having the address A = 1 transmitted from the receiver 100 is received by each terminal device, but if the terminal device 102-1 receives and determines the call signal having the terminal address that matches the self address. The internal processing 106-1 required to respond to the status of the terminal device 102-2 is started, and when the internal processing 106-1 is completed, the response signal 108-1 is transmitted to the receiver.
[0005]
Similarly, each time the terminal address A = 2, 3,... Is sequentially transmitted, the call signals 104-2, 104-3, 104-4,. 3, 106-4... And response signals 108-2, 108-3, 108-4.
[0006]
[Patent Document 1]
JP-A-8-255294 [Patent Document 2]
JP-A-5-225476
[Problems to be solved by the invention]
However, in transmission processing in such a conventional disaster prevention monitoring system, a terminal device that has received a paging signal having an address that matches the self address responds to the receiver after performing internal processing for response. Since the signal is transmitted, the transmission path is not used while the terminal device processes the signal internally, so that there is a problem that the transmission efficiency is lowered and transmission takes time.
[0008]
Therefore, it may be possible to shorten the time required for the internal processing of the terminal device and increase the transmission efficiency, but it is necessary to use a high-speed clock as the CPU clock used in the terminal device. There is a problem that the current increases.
[0009]
An object of the present invention is to provide a disaster prevention monitoring system and a transmission method that improve transmission efficiency and enable high-speed transmission without increasing the speed of a CPU used in a terminal device.
[0010]
[Means for Solving the Problems]
In order to achieve this object, the present invention is configured as follows. The present invention is a disaster prevention monitoring system for monitoring a malfunction such as a fire by connecting a plurality of terminal devices to a transmission line drawn from a receiver, and the receiver repeatedly designates and transmits the addresses of the terminal devices in sequence. When the previous terminal address is designated, transmission of the paging signal having the designated terminal address is started in synchronization with the end of reception of the response signal from the terminal equipment having at least two previous terminal addresses. When receiving a call signal having a terminal address that matches the self address, internal processing for transmitting a response signal is started, and in synchronization with the end of reception of the call signal having at least one terminal address ahead, Transmission of a response signal obtained based on the processing is started.
[0011]
According to such a disaster prevention monitoring system of the present invention, the call signal from the receiver and the response signal from the terminal device are sequentially transmitted to the transmission line successively, and there is no free time on the transmission line. Therefore, transmission can be speeded up accordingly.
[0012]
In the case of a terminal device, the time of internal processing that starts after receiving a call signal having an address that matches the self address is the time until the reception of the call signal having the next terminal address ends (call signal transmission period). ) + (Response signal transmission period) is sufficiently long, so that the CPU clock used for the terminal device can be further slowed down to reduce current consumption.
[0013]
Further, the present invention is a transmission method of a disaster prevention monitoring system for monitoring an abnormality such as a fire by connecting a plurality of terminal devices to a transmission line drawn from a receiver,
A terminal that is specified in synchronization with the end of reception of a response signal from a terminal device having at least two previous terminal addresses when the address of the terminal device is sequentially and repeatedly specified by the receiver and the destination terminal address is specified. Transmission of a paging signal having an address is started, and internal processing for transmitting a response signal upon reception of a paging signal having a terminal address that matches the self address is started by the terminal device, and at least one terminal address is The transmission of the response signal obtained based on the internal processing is started in synchronization with the end of reception of the paging signal.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory diagram of a disaster prevention monitoring system to which the present invention is applied. In FIG. 1, a sensor repeater 3, a smoke analog sensor 4, a thermal analog sensor 5, and a gas leak repeater 6 are provided for detecting an abnormality with respect to the transmission line 2 drawn from the receiver 1. Connected as a terminal device. Each terminal device is taken as an example as an example, but actually one or a plurality of terminal devices are connected.
[0015]
Sensor lines L1 to Ln are drawn out from the sensor repeater 3, and are connected to the on-off type fire sensor 11, respectively. When the on-off type fire detector 11 detects a fire, it short-circuits the sensor line from the sensor repeater 3 and causes a notification current to flow, which is received by the sensor repeater 3 and determined to be a fire.
[0016]
The smoke analog sensor 4 sends an analog detection signal corresponding to the smoke density obtained from the smoke detector to the receiver 1 to make a fire determination on the receiver 1 side. The thermal analog sensor 6 sends an analog heat detection signal from the heat sensing unit to the receiver 1 to determine a fire.
[0017]
A gas leak detector 6a is connected to the gas leak repeater 6. The gas leak detector 6a uses AC100V (not shown) as a power source, and normally outputs 6V, 12V when gas leak is detected. The gas leak repeater 6 determines a gas leak.
[0018]
Furthermore, a control load such as a district bell or a disaster prevention device (not shown) is connected to the transmission line 2 via a control repeater as necessary.
[0019]
The receiver 1 is provided with a monitoring control unit 7 using a MPU, a transmission circuit 8, a display unit 9, and an operation unit 10.
[0020]
The transmission circuit 8 of the receiver 1 collects information on the terminal side by polling by sending a calling signal that sequentially designates the addresses of the terminal devices. For example, A = 1 to 127 is set as the terminal address A on the terminal side, and in the steady monitoring state, a call signal in which the terminal address is sequentially specified is transmitted to call the terminal side, and from the calling terminal, The terminal information detected at that time is transmitted as a response signal.
[0021]
Here, the paging signal from the receiver 1 is voltage mode signal transmission in which the paging signal voltage is superimposed on the power supply voltage for the transmission line 2, while the response signal from the terminal device is current mode signal transmission.
[0022]
The supervisory control unit 7 determines a fire or a gas leak based on information transmitted from each terminal in response to polling by the transmission circuit 8. Of these, the response signals from the sensor repeater 3 and the gas leak repeater 6 directly indicate the presence or absence of a fire or gas leak. I do.
[0023]
On the other hand, for the smoke analog sensor 4 and the thermal analog sensor 5, analog detection information is transmitted as a response, so the monitoring control unit 7 compares the analog information with a threshold value and makes a fire determination.
[0024]
On the terminal side connected to the transmission path 2 from the receiver 1, a transmission circuit 3a, a CPU 3b, and a sensor circuit 3c are provided, for example, as shown in the sensor repeater 3. The transmission circuit 3a receives the call signal from the transmission circuit 8 of the receiver 1, takes in the call signal when it is determined that the address of the call signal matches the self address, and includes the command included in the call signal. The CPU 3b performs internal processing for the detection state of the sensor circuit 3c necessary for the response, for example, and sends a response signal to the receiver 1 at a predetermined response timing.
[0025]
In this respect, the smoke analog sensor 4 is also provided with a transmission circuit 4a, a CPU 4b, and a sensor circuit 4c. The thermal analog sensor 5 and the gas leak repeater 6 also have the same transmission circuit and CPU, and the sensor circuit has a detection function corresponding to each detection abnormality.
[0026]
FIG. 2 is a time chart between the receiver 1 and the terminal side in the disaster prevention monitoring system of FIG. In FIG. 2, the receiver 1 repeatedly designates the address A = 1 to 127 of the terminal sequentially, and sends the calling signals 14-1, 14-2, 14-3, 14-4, 14-5,. 2 is sent out.
[0027]
Assuming that the receiver 1 sends a call signal 14-1 consisting of a terminal address A = 1 and a polling command to the transmission line, the call signal 14-1 is received by all the terminals 12-1 to 12-n. However, the terminal 12-1 determines that the address of the calling signal 14-1 matches the self address, and the internal processing 15-1 is started.
[0028]
The terminal 12-1 continues the internal processing 15-1 even if the receiver 1 sends out the call signal 14-2 of the next address A = 2 to the transmission path 2, and A response signal 16-1 including response information obtained as a result of the internal processing 15-1 is transmitted to the receiver 1 at the timing when the transmission of the calling signal 14-2 at the address A = 2 is completed.
[0029]
Simultaneously with the transmission of the response signal 16-1 at the terminal 12-1, at the terminal 12-2, the internal processing 15-2 is performed by determining whether the address A = 2 of the calling signal 14-2 and the own address match. Has started.
[0030]
When the transmission of the response signal 16-1 from the terminal 12-1 is completed, the receiver 1 starts transmitting the call signal 14-3 of the next address A = 3. At this time, the internal processing 15-2 is continuing in the terminal 12-2. In the same manner, the call signals 14-4, 14-5,... From the receiver 1 and the internal processes 15-2, 15-3,. Based on the response signals 16-2, 16-3,...
[0031]
In such transmission processing between the receiver and the terminal of the present invention in FIG. 2, when the destination terminal address is designated, reception of the response signal from the terminal device having the previous terminal address is completed. It can be seen that transmission of the paging signal having the terminal address is started in synchronization with.
[0032]
For example, when the receiver 1 designates the address A = 3 for the terminal 12-3 as the destination terminal address, the terminal 12- having two previous terminal addresses A = 1 with respect to the terminal address A = 3. In synchronization with the reception of the response signal 16-1 from 1, the transmission of the call signal 14-3 having the terminal address A = 3 is started.
[0033]
On the other hand, the terminal side starts internal processing 15-2 for transmitting a response signal when receiving a call signal 14-2 having a terminal address that matches the self address, such as the terminal 12-2. Then, it can be seen that the transmission of the response signal 16-2 obtained based on the internal processing 15-2 is started in synchronization with the end of reception of the calling signal 14-3 having the next address A = 3.
[0034]
By such transmission processing in the present invention, the call signal from the receiver 1 and the response signal from each terminal are alternately sent to the transmission line 2, and there is no free time on the transmission line. There is no decrease in transmission efficiency due to the idle time existing in the transmission line as in the conventional transmission processing shown, and higher speed transmission can be performed between the receiver and the terminal.
[0035]
Also, the time during which internal processing can be performed on the terminal side is, for example, when viewing the terminal 12-1 in FIG. 2, the response signal 16-n of the previous terminal 12-n and the call signal 14-1 of the next address These two signal transmission periods are added, and the time for internal processing in the terminal has a sufficient margin. For this reason, a CPU with a low-speed clock can be used as a CPU provided in the terminal, and current consumption on the terminal side can be reduced by using the low-speed clock.
[0036]
FIG. 3 shows a basic transmission format of a paging signal and a response signal transmitted between the receiver and the terminal of FIG.
[0037]
The transmission format in FIG. 3 is 11-bit data composed of 1 start bit 17, 8 data bits 18, 1 parity bit 19 and 1 end bit 20, and this 11-bit data. Is processed as 1-byte data.
[0038]
The call signals 14-1, 14-2, 14-3,... From the receiver 1 in FIG. 2 are 3-byte data for continuously transmitting the 1-byte data in FIG. The response signals 16-1 to 16-n from the -1 to 12-n side are 2-byte data for transmitting the 1-byte data in FIG. 3 twice in succession.
[0039]
Therefore, the time of internal processing 15-1 to 15-n in the terminals 12-1 to 12-n can secure a time of 5 bytes (55 bits) including the call signal 3 bytes and the response signal 2 bytes. it can.
[0040]
FIG. 4 is a flowchart of receiver processing by the transmission circuit 8 provided in the receiver 1 of FIG. In this receiver processing, after address initialization is performed in step S1, a call signal having an initialized address is transmitted in step S2. In step S3, reception of a response signal from a terminal having the previous address is checked.
[0041]
When a response signal from a terminal having the previous address is received, the response data is stored in step S4, and then the completion of reception of the response signal is checked in step S5. When the reception of the response signal is completed, the address is incremented by 1 in step S6, and then the call signal of the increased address is transmitted in step S7.
[0042]
Subsequently, in step S8, it is determined whether or not it is the final address. If it is not the final address, the process returns to step S3, returns to the process of waiting for reception of the response signal of the address two previous to the current address, and this is repeated. If it is the last address in step S8, the process returns to step S1, the address is initialized, and the processing from step S2 is repeated.
[0043]
FIG. 5 is a flowchart of terminal processing on the terminal side in FIG. In this terminal processing, the reception of the call signal from the receiver is checked in step S1, and when the call signal is received, the presence or absence of a match with the self address is determined in step S2. In S3, internal processing is started.
[0044]
Subsequently, in step S4, the reception of the call signal of the next address is checked. When the reception of the call signal of the next address is determined, the reception end of the call signal is determined in step S5, and the response signal is determined in step S6. Send. Similarly, the processing from step S1 is repeated.
[0045]
FIG. 6 shows another embodiment of the transmission processing according to the present invention. The internal processing time is extended by extending the response from the reception of the paging signal matching the self address to the reception of the paging signal of the second address. It is a time chart.
[0046]
In this embodiment, when the receiver designates the destination terminal address, the receiver receives the call signal having the designated terminal address in synchronization with the end of reception of the response signal from the terminal device having the previous three terminal addresses. In response to this, when a terminal device receives a call signal having a terminal address that matches its own address, the terminal device starts internal processing for transmitting a response signal and has a second terminal address. Synchronous with the end of reception of the calling signal, transmission of a response signal obtained based on internal processing is started.
[0047]
For example, when the receiver 1 designates the terminal address A = 4 of the terminal 12-4 as the transmission destination, the reception of the response signal 16-1 from the terminal 12-1 having the terminal address A = 1 three times before is terminated. Transmission of the calling signal 14-4 having the terminal address A = 4 designated in synchronization is started.
[0048]
On the other hand, when the terminal side receives a call signal 14-3 having a terminal address that matches the self address A = 3, for example, the terminal 12-3, an internal process 15- for transmitting a response signal is received. 3 is started, and the transmission of the response signal 16-3 obtained based on the internal processing 15-3 is started in synchronization with the reception end of the paging signal 14-5 having the terminal address A = 5 of the second destination. ing.
[0049]
The time that can be allocated to the internal processing in this case is twice as long as (calling signal period) + (response signal period). If the calling signal is 3 bytes and the response signal is 2 bytes, 10 bytes (110 bits) ) Can be expanded to minutes.
[0050]
When such an internal processing time is extended, the response period is only delayed by (call signal period) + (response signal period) with respect to FIG. 2 with respect to the call period of the address A = 1 to 127. This level of delay is not a problem for real-time monitoring.
[0051]
As another embodiment, the transmission of the paging signal on the receiver side is further increased four times before the designated destination terminal address, five times before, and the terminal side correspondingly corresponds to this. The transmission of the response signal obtained based on the processing is started in synchronization with the termination of the reception of the call signal having the terminal address increased by three, four, and so on. You may enlarge.
[0052]
In addition, the terminal address may be included in the response signal from the terminal, so that it is possible to surely understand which terminal the response signal is from in the transmission with the receiver. Incorrect processing can be prevented.
[0053]
【The invention's effect】
As described above, according to the present invention, the call signal from the receiver and the response signal from the terminal device are sequentially transmitted to the transmission line, and there is no idle time on the transmission line. Accordingly, high-speed transmission can be performed.
[0054]
In the terminal device, the time required for the internal processing can be secured from the reception of the call signal having the address matching the self address until the termination of the reception of the call signal having the next terminal address. A sufficiently long internal processing time, which is at least the sum of the transmission period of the call signal and the response signal, can be ensured. For this reason, the current consumption can be reduced by reducing the CPU clock used for the terminal device.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a disaster prevention monitoring system to which the present invention is applied. FIG. 2 is a transmission processing time chart according to an embodiment of the present invention. FIG. 3 is an explanatory diagram of a transmission format used in the present invention. 1 is a flowchart of the receiver processing of the present invention in FIG. 1. FIG. 5 is a flowchart of the terminal processing of the present invention in FIG. 1. FIG. 6 is a time chart of transmission processing according to another embodiment of the present invention. Processing time chart [Explanation of symbols]
1: Receiver 2: Transmission path 3: Sensor repeaters 3a, 4a, 8: Transmission circuits 3b, 4b: CPU
3c, 4c: Sensor circuit 4: Smoke analog sensor 5: Thermal analog sensor 6: Gas leak relay 6a: Gas leak detector 7: Monitoring control unit 9: Display unit 10: Operation unit 11: On / off type fire detection Devices 12-0 to 12-n: Terminal devices 14-0 to 14-n: Call signals 15-0 to 15-n: Internal processing 16-0 to 16-n: Response signal 17: Start bit 18: Data bit 19 : Parity bit 20: End bit

Claims (2)

In a disaster prevention monitoring system that monitors and controls abnormalities such as fire by connecting multiple terminal devices to the transmission line drawn from the receiver,
The receiver sequentially and repeatedly specifies the address of the terminal device, and when the destination terminal address is specified, the receiver synchronizes with the end of reception of the response signal from the terminal device having at least two previous terminal addresses. Start sending a ringing signal with the specified terminal address,
When the terminal device receives a paging signal having a terminal address that matches the self address, the terminal device starts internal processing for transmitting a response signal, and ends reception of the paging signal having at least one terminal address ahead. A disaster prevention monitoring system characterized by starting transmission of a response signal obtained based on the internal processing in synchronization. In the transmission method of the disaster prevention monitoring system that monitors and controls abnormalities such as fire by connecting multiple terminal devices to the transmission line drawn from the receiver,
When the receiver sequentially designates the address of the terminal device and designates the destination terminal address, the receiver synchronizes with the end of reception of the response signal from the terminal device having at least two previous terminal addresses. Start sending a ringing signal with the specified terminal address,
When the terminal device receives a call signal having a terminal address that matches the self address, it starts an internal process for transmitting a response signal and ends reception of the call signal having at least one terminal address ahead. A transmission method for a disaster prevention monitoring system, wherein transmission of a response signal obtained based on the internal processing is started synchronously.

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