JPS6128255A - Address polling communication method - Google Patents

Abstract

PURPOSE:To attain address participation optionally by providing a polling check code to a command data frame to attain polling only to a required terminal device automatically and use a common interruption address. CONSTITUTION:A polling check signal (CK) is assigned to a command data frame. After application of power, a control center 1 adds a CK code and applies sequentially polling and each terminal device outputs a response signal 8 at own address transission. The control center 1 stores a response address and outputs a response address group and an interruption address at the next polling. The devices of addreses 0, 2 have a response and the polling is applied from the next time and the device of an address 1 gives no response and is not an object of the next polling. The said interruption address is utilized when the terminal device of the address participates in the polling during the execution of polling.

Description

[Detailed description of the invention] It concerns the method of borrowing.

Conventional configuration and its problems A system configuration diagram of a conventional polling communication method is shown in FIG. In FIG. 1, a control center 1 performs data communication with a plurality of terminal devices 3 through a communication line 2. As shown in FIG. Generally, the communication line 2 has a data format configuration shown in FIG.
1"K, and has a start bit 6 and a stop bit 7 for synchronization indicating the start and end of these. At this time, the maximum number of terminal devices that can be accessed N is the address frame 4.
It is determined by the number of bits A allocated to ba, which is N-2A. Normally, when configuring and developing this system, we consider future expandability and allocate bits with ample margin.

In the conventional polling communication method, the control center 1 sequentially increases the address and performs polling, so when the above-mentioned expandability is taken into consideration, polling is carried out wastefully and the response of the terminal equipment becomes slow. In addition, in order to compensate for this drawback, it is possible to input the final address of a terminal device that can respond into the control center 1, but this is time-consuming and may not be able to respond due to the power being turned off or malfunctioning. However, this method has the disadvantage of requiring unnecessary polling.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks. It automatically registers terminal device addresses that can respond to data in a control center without unnecessary polling, and even if an interrupt occurs during the process, will be addressed on the next poll,
The present invention provides a polling communication method that can respond in the shortest possible time.

Structure of the Invention The present invention includes a control center, a plurality of terminal devices, and a communication line that enables this communication, and controls the terminal devices from the control center by an address polling method.
This is an address registration method for transmitting data from terminal equipment, and the control center sequentially increments from address O to the maximum address on the transmission communication line at the start of execution, and the command data frame at this time includes polling check data. Transmit the code. The transmission format is such that, if each terminal device is in a response-enabled state, it can respond with a signal on the response communication line when transmitting its own address, and register the address with the control center.

Furthermore, the configuration is characterized in that one of the address numbers can be used for interrupts.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The hardware configuration of this embodiment is 5.\\ as shown in Figure 1.

Although it is conventional, the present embodiment differs from conventional communication methods in the transmission/reception format and code assignment. That is, the command data frame 5 shown in FIG.
Among them, a signal for polling check is assigned. If this signal is assumed to be a CK code, the control center 1 and each terminal device 3 perform the following operations as shown in FIG.
Do the following. 1 and 7 are added and polling is performed sequentially.

(2) Each terminal device 3 decodes the signal on the transmission line and outputs a response signal 8 on the response line when transmitting its own address.

(2) The control center 1 stores the addresses that have responded, and outputs a group of response addresses and one interrupt address onto the transmission line for the next polling.

In FIG. 3, the devices at addresses 0 and 20 have responded and will be polled from the next time onwards.

Also, the device at address 1 is in the power off state or , /
6,-7 If a device cannot respond due to a malfunction or other reason, it will not respond and will be excluded from the next polling, as shown in Figure 3, and the control center 1 will be able to poll only the necessary devices. can.

Conversely, it also allows you to know the non-responsive device number, which is useful for checking for malfunctions, etc.

Next, during execution of polling, the above-mentioned interrupt address is used as a means for the terminal device at address 1 to participate in polling due to factors such as turning on the power or recovering from a failure. That is, if the interrupt address is ADDN in FIG. 3, after observing the communication line for several cycles, it is confirmed that there is no polling at all, and the terminal device at address 1 responds to the polling of ADDN. In response to this response signal, the control center 1 repeats the above-mentioned operations ■ to ■, and when each terminal device 3 responds again when calling its own address, the control center 1
This means that a new terminal device 3 that can respond can be stored and polling can be started again at the earliest. Further, even if there are a plurality of interrupt devices 3, since all addresses are checked, the process always converges, and the original data transmission/reception becomes possible, and it is easy to do so.

Effects of the Invention As mentioned above, by providing a polling check code as a format for the polling communication method and checking all addresses when the system starts up, it is possible to automatically poll only the necessary terminal devices, and also to use a common interrupt address. By having this, it becomes possible to enter addresses arbitrarily.

This polling method can be used for status monitoring and remote control of household appliances, audio system status monitoring, and remote control, etc., and it eliminates wasted response time, which is a drawback of the address polling method, and minimizes the time. A communication method that enables polling can be provided.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a polling method, FIG. 2 is a configuration diagram of a conventional data format, and FIG. 3 is an operation explanatory diagram of an address polling communication method in an embodiment of the present invention. 1... Control center, 2... Communication line,
3...Terminal 41.4...Address frame, 5...Command data frame, 6...
...Start bit, 7...Stop bit.

Claims (2)

[Claims] (1) A communication system comprising a control center, a plurality of terminal devices, and a communication line connecting the control center and the plurality of terminal devices, and performing two-way data communication using an address polling method; At the start of the process, the control center polls all the addresses of the plurality of terminal devices by adding an operation response signal code, and each terminal device sends a response signal code to the control center at the time of self-address. An address polling communication method characterized in that a control center addresses an address number that has received a response and one common interrupt address from the next polling. (2) When an unregistered terminal device joins the communication line, it sends a response signal to the control center when calling the above common interrupt address, and the control center, after confirming the interrupt signal, starts polling again. 2. The address polling communication method according to claim 1, wherein the address polling communication method is characterized in that the terminal equipment that can respond is reconfirmed and polled.