JPH04238436A - Polling communication system - Google Patents

Abstract

PURPOSE:To realize efficient polling for plural subordinate devices by providing display means whether power is cut or not and whether a system is in the middle of an initial processing or not for respective subordinate devices and transmitting the outputs to a central device. CONSTITUTION:The power cut display means 4 showing whether power is cut or not and the initial processing display means 3 are provided for the subordinate device 2i. The central device 1 recognizes whether power is cut or not and whether the system is in the middle of the initial processing or not by the outputs of the means 3 and 4 from the subordinate device 2i through transmission lines 5i and 6i. Thus, the device 1 executes polling for the device 2i which cannot respond to polling, wastefult time is prevented from being wasted and the processing of polling can be made efficient.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to polling communication systems. For example, in a communication system, a monitoring device polls a plurality of monitored devices to collect information from the plurality of monitored devices. In such cases, although the monitored device may not always be able to respond to polling, it is required that information be collected efficiently.

0002

[Prior Art] For example, in a communication terminal station having a redundant configuration, switching between an active terminal station relay device and a standby terminal station relay device is performed by a plurality of protection switches (PSWs). A protection switch controller (PSW CONT) is provided to monitor and control the status of the plurality of protection switches (PSW). The protection switch controller polls multiple protection switches to monitor the status of each protection switch (PSW). However, each protection switch is an individual unit, and it may be unable to respond to polling from the protection switch controller because it is powered off or is in the process of initializing. be. In such a case, the protection switch controller recognizes the above state by not responding for a predetermined period of time. Therefore, there is a problem in that it takes time to recognize that the polled protection switch is unresponsive, and information collection from the protection switches cannot be performed efficiently.

0003

SUMMARY OF THE INVENTION An object of the present invention is to provide a polling communication system that efficiently polls a plurality of slave devices from a central device.

0004

[Means for Solving the Problems] FIG. 1 is a diagram showing the basic configuration of the present invention. In FIG. 1, 1 is the central device, 2i
is a conventional device. Here, it is assumed that i=1 to n. In the slave device 2i, 3 is an initial processing display means, and 4 is a power cutoff display means. Each slave device 2i
(i=1 to n) and the central device 1 are connected by a transmission line 5i.
, 6i, and 7. The connection relationship between the plurality of slave devices 2i (i=1 to n) and the central device 1 is shown in FIG.

The power-off display means 4 indicates whether or not the power of the corresponding slave device 2i is turned off. The initial processing display means 3 indicates whether or not the corresponding slave device 2i is undergoing initial processing. The output of the power disconnection indicating means 4 is transmitted through the transmission line 5i.
The data is transmitted to the central device 1 via. Further, the output of the initial processing display means 3 is transmitted to the central device 1 via the transmission line 6i.

[0006]

[Operation] With the above-described configuration, the central device 1 receives the power-off indication transmitted from the plurality of slave devices 2i (i=1 to n) to the central device 1 via the transmission lines 5i and 6i, respectively. From the outputs of the means 4 and the initial processing display means 3, it is possible to recognize whether or not the power of the corresponding slave device 2i is turned off and whether or not the corresponding slave device 2i is in the process of initial processing. Therefore, the central device 1 does not waste time polling the slave device 2i that cannot respond to polling, and the polling process becomes more efficient.

[0007]

Embodiment FIG. 3 shows, as an embodiment of the present invention, the configuration of a terminal station having a plurality of protection switches (two for simplicity) and a protection switch controller that monitors and controls these two protection switches. It is something. In FIG. 3, 20 is a protection switch controller, 21 and 24 are protection switches 22, 23, 25, and 26.
31 and 32 are signal lines from the protection switches 21 and 24 to the protection switch controller 20, respectively. 33 and 34 are signal lines for polling communication between the protection switch controller 20 and the protection switches 21 and 24, and 35 to 38 are terminal relay devices 22, 23, 25, and 26, respectively. The protection switch controller 20 is connected to the terminal relay devices 22, 23, 25, and 26.
This is a signal line for transmitting a switching trigger from the protection switch controller 20 to the protection switch controller 20, and for transmitting control information to other stations from the protection switch controller 20 to the terminal relay devices 22, 23, and so on.

FIG. 4 shows a more detailed configuration of the protection switch controller 20 and protection switches 21 and 24 in the configuration of FIG. In FIGS. 3 and 4, the same components are designated by the same reference numerals. In particular, the signal lines 33 and 34 for communicating by polling between the protection switch controller 20 and the protection switches 21 and 24 are not shown in detail in FIG. 3, but are actually shown in FIG. The protection switch controller 20 is connected to the protection switches 21 and 24 in a multi-drop manner.

In FIG. 4, 11 is a CPU in the protection switch controller 20, 12 is a transmission/reception buffer in the protection switch controller 20, and 1 is a CPU in the protection switch controller 20.
4 is a transmission/reception buffer in the protection switch 21 or 24, 15 is a CPU, 16 is an initial processing display flag register, and 17 is a power-off display flag register. Although the configuration of the protection switch 24 is not shown in FIG. 4, the protection switch 21
The configuration is similar to that of . Communication by normal polling is
CPU 11 of protection switch controller 20
and the CPU in the protection switch 21 or 24
15 via respective transmission/reception buffers 12 and 14 and signal lines 33 and 34. The power-off display flag register 17 is set and reset according to whether the corresponding protection switch 21 or 24 is powered on or off. Further, the initial processing display flag register 16 is set in response to turning on the power of the corresponding protection switch 21 or 24.
4 starts initial processing in response to the power being turned on, and is reset by the CPU 15 when the initial processing is completed. The outputs of the initial processing display flag register 16 and the power-off display flag register 17 are transmitted to the protection switch controller 20 by, for example, an RS232C interface.

Protection switch controller 20
receives information from each protection switch 21 and 24 about whether or not the above-mentioned power ON/OFF and initial processing is in progress, and each protection switch turns ON/OFF the power.
It recognizes whether or not OFF and initial processing is in progress, and when the power ON flag register 17 is in the reset state, a power alarm is generated, and when the power ON flag register 17 is in the set state and the initial processing flag register is in the reset state, When it is determined that the initial processing is in progress, and the power ON flag register 17 is set, and the initial processing flag register is also set, it is determined that the protection switch is accessible and polling is performed. Therefore, by not polling a protection switch that is powered off or in an initial processing state, the processing for collecting information from the protection switch controller becomes more efficient.

[0011]

According to the polling communication system of the present invention, it is possible to efficiently poll a plurality of slave devices from a central device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of the present invention.

FIG. 2 is a diagram showing a connection relationship between a central device and a plurality of slave devices of the present invention.

FIG. 3 shows, as an embodiment of the present invention, the configuration of a terminal station having a plurality of protection switches (two for simplicity) and a protection switch controller that monitors and controls these two protection switches. .

FIG. 4 shows a protection switch controller 20 and a protection switch 2 in the configuration of FIG.
1 and 24 are diagrams showing more detailed configurations.

[Explanation of symbols]

1... Central device 2i... Conventional device 3... Initial processing display means 4... Power cutoff display means 5i, 6i, 7... Transmission line 11... C in protection switch controller 20
PU 12...Transmission/reception buffer 14 in the protection switch controller 20...Transmission/reception buffer 15 in the protection switch 21 or 24...CPU 16...Initial processing display flag register 17...Power off display flag register 20...Protection switch controller 21, 2
4...Protection switch 22, 23, 25,
26...Terminal relay equipment (LTE) 31, 32...Signal lines 33, 34 from the protection switches 21 and 24 to the protection switch controller 20...Communicate by polling between the protection switch controller 20 and the protection switches 21 and 24 Signal lines 35 to 38 for terminal station relay devices 22, 23, 25, and 26 and protection switch controller 20
signal line connecting between

Claims (3)

[Claims] Claim 1: A central device (1) is connected to a plurality of slave devices (
21, 22, ... 2n) to transfer information between the central device and a plurality of subordinate devices.
Each of the slave devices (21, 22, ... 2n) includes a power-off display means (4) for indicating whether or not the power of the slave device (21, 22, ... 2n) is turned off, and
2, . . . 2n); and initial processing display means (3) for indicating whether initial processing is in progress or not. 2. The power off display means (4) is set in response to turning on the power of the slave device, and is set when the power of the slave device is turned on.
It consists of a first flag register (17) which is relayed in accordance with the FF, and the initial processing display means (3).
) is set in response to turning on the power of the slave device,
2. The polling communication system according to claim 1, further comprising a flag register (16) that is reset upon completion of initial processing of said slave device. 3. The output of the power-off display means (4) and the output of the initial processing display means (3) are respectively transmitted to the central device (1) through dedicated signal lines (5, 6). The polling communication system according to claim 1.