JPH0239296A - Environmental abnormality monitor device - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency by adopting the high-speed poling system in case of normal monitor and using a bit address means together in case of the occurrence of abnormality or on demand at the time of successively calling plural slave stations from a master station to take in and monitor information of each slave station. CONSTITUTION:When a transmission signal is sent from a master station 1, it is inputted to a mode discriminating circuit 21 in a slave station 2 to check the mode signal, and the next bit string address signal is temporarily taken into a shift register of the circuit 21 and is preset to a counter 22. An address comparator 24 compares contents of an address setter 23 to which the address peculiar to the slave station is set with contents of the counter 22; and when they coincide with each other, a signal processing circuit 26 is prompted to return these contents. When the mode signal sent from the master station 1 indicates the bit string address mode, the pulse counting mode is discriminated by a mode discriminating circuit 21 in the slave station 2, and the preset value of the counter 22 is counted up by one for each pulse. Thereafter, this result is compared with contents of the address setter 23 by the comparator 24 and is returned to the master station.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention detects environmental parameters such as smoke/gas concentration and temperature at a location where a slave station is installed, and centrally transmits this detected information in a master station. The present invention relates to an environmental abnormality monitoring device for monitoring.

[Prior art] A plurality of slave stations such as fire alarms and gas leak detectors are connected to a common transmission line extending from a master station, and each slave station is sequentially called by address polling, and each slave station's sensor An example of a so-called intelligence-type alarm device that imports detected analog information such as temperature and smoke density into a master station, processes it, and displays an alarm is the Japanese Patent Laid-Open No. 58
-127292 etc. is already known.

The conventional polling method for such alarm devices is
One method is to send a unique address consisting of multiple bit strings from the master station to call each slave station, and the other is to send a timing pulse from the master station, count this pulse at the slave station, and use this counted value as address information for each slave station. Two methods are known: a method of calling a station; and a method of calling a station.

[Problems to be Solved by the Invention] In the conventional polling method for such a monitoring device, firstly, in the former method, regardless of the order in which the slave stations are called, the address of the slave station to be called is always Since it is necessary to send out address data consisting of a plurality of bit strings, the transmission efficiency in exchanging information with slave stations is not high, and there are often problems with transmission speed.

In addition, although the latter pulse counting method has the advantage that the speed required for polling is relatively fast, it is determined that polling is always started from the slave station at a predetermined address (usually number 0), and the slave station Since the order of calling is unchanged, it is not suitable for a master station to specify and call a specific slave station, especially a slave station that is later in the calling order.

In addition, slave stations located in the rear are susceptible to disturbances caused by external noise, which has the disadvantage of reducing transmission reliability.

[Means for Solving the Problems] In order to solve these problems, the present invention provides a system in which a plurality of slave stations extending from the master station detect environmental parameters such as smoke/gas concentration, temperature, and humidity. In an environmental abnormality monitoring device that is connected to a common transmission line and monitors environmental abnormalities by sending and receiving signals by sequentially calling each slave station from the master station, as a polling means for calling each slave station from the master station.
It uses a combination of two means: a bit string address means consisting of a plurality of bit strings, and a pulse counting means that counts timing pulses, and also as a polling means for calling each slave station from the master station, before the timing pulse sent from the master station. Address data consisting of multiple bit strings is sent, and the slave station receives the above address data and presets it in the pulse counting means.The received address is the value obtained by counting the timing pulses, and a response is made when it matches the above unique address. This is what I did.

5 Examples] Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration for explaining the monitoring device of the present invention, in which 1 is a master station, L is a common transmission line extending from the master station 1, and 2 is connected to the transmission line. The master station 1 includes a transmission circuit and a transmission circuit for exchanging information with each slave station 2. It consists of a memory that stores a control program for controlling and a processing program for processing information, and a microcomputer (CPU) that performs processing according to these programs.

FIG. 2 shows a slave station 2 as an example of the slave station 2, which includes a mode identification circuit 21 that identifies whether polling is to be performed using two polling modes, ie, bit string address means or pulse counting means, and a mode identification circuit 21 that takes in address pulses. Each includes a counter 22 , an address setter 23 , an address comparator 24 , and a signal processing circuit 26 that processes analog information from the gap sensor 25 based on the output of the address comparator 24 and sends it back to the master station 1 . ing.

FIG. 4 shows an example of a transmission frame between the master station 1 and slave station 2 of such a monitoring device.

When a transmission signal is sent from the master station 1 via the transmission line, the slave station 2 sends it to the mode identification circuit 2 via the transmission circuit 20.
1 and the mode signal of the transmission frame is examined. Next, the bit string address signal sent after the mode signal is temporarily taken into a shift register in the mode identification circuit 21 (not shown), and the bit string data from the shift register is preset in the counter 22 in parallel. The address comparator 24 compares the contents of the address setter 23 in which the slave station's unique address is set with the contents of the counter 22, and if they match, processes the signal of the sensor 25 and sends a signal back to the master station. The signal processing circuit 26 that generates the data is prompted to send it back.

The signal processing circuit 26 responds to a timing signal generated within the transmission circuit 20 based on the output of the address comparator 24 and sends it back to the master station 1 via the transmission line.

If the mode signal sent from the master station 1 is the bit string address mode, the above process is repeated for each polling, and if the mode signal is the pulse counting mode, the start address is After the response from the slave station, the master station 1 sends a timing pulse to each slave station to be called sequentially. Therefore, in the slave station 2, when the mode identification circuit 21 determines that it is in pulse counting mode, the next signal sent from the master station 1 is the timing pulse or the pulse counting stop signal, so it receives the latter signal. Until then, the signal sent from the master station 1 is regarded as a timing pulse, and the counter 22 counts the signal one by one from the preset value. The counted result is compared with the contents of the address setter 23 by the address comparator 24, and if they match, the signal processing result of the sensor 25 is sent back to the master station 1 as described above. Note that the block diagram shown in this embodiment shows the minimum configuration necessary for explaining the present invention, and a plurality of functions can be added. Furthermore, if the scale of the device to be monitored by the device of the present invention is even larger, a plurality of master stations 1 may be provided as shown in FIG. You can also do that.

Such operations will be explained using processing flows as shown in FIGS. 5 and 6.

That is, normally, polling is performed between the master station 1 and the slave station 2 in a high-speed timing pulse counting mode, and therefore the master station 1 first sends out a mode signal [fifth
Figure step (c). Thereafter, the start address N is sent out [step (d) in FIG. 5], and the 8M slave station 2 is called, and the return information is fetched from the slave station 2 [step (e)]. After the return information is retrieved, check whether to continue or end the pulse counting mode [Step]. If not, update the calling address [Step (G)] and output a timing pulse [Step (H)]. If the calling address is the end address, instruct the slave station 2 to end the pulse counting mode. Output a stop signal to notify [Step (su)], ■
Return to

Therefore, in the pulse counting mode, each slave station (n+1), (n
+2), . . . , and the returned information from the slave station 2 is fetched and processed.

Note that when the mode is not pulse counting mode, it is called bit string address mode, although it is not shown in the figure, after mode output, when bit string address data is sent out, there is a return signal from the corresponding slave station 2. After receiving and processing, return to ■.

FIG. 6 is a processing flow of the above operation viewed from the slave station side. Among the transmission frames sent from master station 1, the first mode signal is checked for identification [Step (R) in Figure 6]. If it is pulse counting mode, the next step (O) is performed.
The start address N is taken in and set in a buffer (not shown). Next, the contents of the buffer are compared with the address setter 23 in which the unique address of the slave station 2 is set [Step (wa)ko], and if they match, the data of the slave station is returned [Step (power)] ]. If they do not match, data return is skipped. When the period of return data has elapsed, either a stop signal or a timing pulse is sent from the master station 1. Therefore, in step (y), it is checked whether the received signal is a stop signal, and if it is not a stop signal, it is checked whether it is a timing pulse. The contents of the buffer are updated [step (shi)] and the process returns to step (wa) to check the address N and the unique address again.If it is not a timing pulse, it is noise etc., so return to ■.In step (y) When it is confirmed that it is a stop signal, the current pulse counting mode is ended and preparations are made to receive the transmission frame sent from the next master station. In this case, although not shown, the address data after the mode signal is stored, the contents of the address setter are compared, and if they match, the data of the slave station is returned.In other cases, , ■
and prepares to receive the next transmission frame.

The mode can be changed from the pulse counting mode to the bit string address mode, for example, when the return signal shows a predetermined change in step (e) in FIG. You can set the polling mode in advance so that it changes when the polling mode is detected, or specify a specific slave station 2 from the master station 1.
The calls can be configured to change when needed. The transmission frame at the time of this change is shown by the mth slave station in FIG. 4. After the stop signal and the mode signal, a bit string address signal is sent from the master station 1, and the mth slave station 2 is called. The returned information from the slave station 2 is taken in.

In this FIG. 4, an example is shown in which the mode returns to the normal pulse counting mode. Therefore, after the return information from the m-th slave station, the mode signal and start address signal are issued from the master station, and the second slave station is called. Thereafter, the slave stations are sequentially called p+l, p+2, . . . in pulse counting mode using timing pulses. As mentioned above,
In this embodiment, the start address is set in the pulse counting mode, but the present invention is not limited to this. In other words, instead of the start address consisting of a plurality of bit string data, a unique It is clear that even if the start pulse is configured to always initiate transmission from a slave station at a predetermined address, the effectiveness of the present invention will not be significantly impaired.

[Effects of the Invention] The monitoring device of the present invention is configured to sequentially call a plurality of slave stations from a master station, acquire information on each slave station, and monitor the device. The configuration uses a high-speed polling method using the counting means, and a method of calling the system using the bit string address means at the time of an abnormality alarm or as necessary. It has features such as being able to collect specified information at will. Furthermore, the fact that the start address can be set in the transmission frame by the pulse counting means also has the feature that it is possible to suppress to a certain degree a decrease in reliability due to the incorporation of noise in the pulse counting means.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the overall configuration of this invention, Fig. 2 is an example of a circuit block of a slave station, Fig. 3 is an example of another system diagram, Fig. 4 is an example of a transmission frame, and Fig. 5 is an example of the invention. FIG. 6 shows a processing flow on the master station side to explain the operation of the monitoring device, and FIG. 6 shows a processing flow on the slave station side. 1. Master station 2. Slave station L.. Transmission line mode identification circuit/sensor

Claims (1)

[Claims] 1) A plurality of slave stations that detect environmental parameters such as smoke/gas concentration, temperature, and humidity are connected to a common transmission line extending from the master station, and the master station sequentially connects each slave station. In an environmental abnormality monitoring device that sends and receives signals by calling and monitors environmental abnormalities, the polling means for calling each slave station from the master station uses a bit string address means using address data consisting of a plurality of bit strings and counting timing pulses. An environmental abnormality monitoring device characterized by using a combination of two pulse counting means. 2) Slave stations with multiple unique addresses that detect environmental parameters such as smoke/gas concentration, temperature, and humidity are connected to a common transmission line extending from the master station, and each slave station is connected to the master station. In an environmental abnormality monitoring device that monitors environmental abnormalities by sending and receiving signals by sequentially calling each slave station, address data consisting of a plurality of bit strings is sent before the timing pulse sent from the master station as a polling means for calling each slave station from the master station. The slave station receives the above address data,
An environmental abnormality monitoring device characterized in that after presetting a pulse counting means, a value obtained by counting timing pulses is used as a reception address, and a response is made when the value matches the unique address.