JPS61152141A - Radio station monitor system - Google Patents

Abstract

PURPOSE:To reduce the ratio of an overall system down and to improve the reliability of the entire system by making an interception station operate as a backup and access to a slave station when a master station is troubled. CONSTITUTION:The master station 1 of a radio station monitor system transmits intermittently control data 21-24 to plural slave stations 11-14, and collects transmission data 31-34 from the slave stations 11-14. The interception station 2 which does not directly take part is arranged on the system composed of the master station 1 and the slave stations 11-14, and monitors a carrier 20 from the master station 1. When the master station 2 is troubled and transmis sion becomes impossible in this system, the interception station 2 integrates non-carrier period, and judges the trouble of the master station 1 if the period exceeds the prescribed longest period. Then the interception station 2 transmits control data 41-44 to the slave stations 11-14, receives transmission data from said stations 11-14, forms a backup mode and prevents the system down.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wireless station monitoring system having a backup function for wireless systems such as telemeters.

(Prior Art) Conventionally, in various wireless systems such as telemeter systems in which a master station accesses a slave station intermittently, the interception station only has a receiving function, but if the master station fails and access to the slave station is interrupted. When this becomes impossible, there is a problem in that the functions of this system stop (the entire system shuts down) even though these interception stations and slave stations are operating normally.

(Object of the Invention) The purpose of the present invention is to solve such problems and add a transmission function to the interception station so that when the master station fails, the interception station itself accesses the slave station, thereby increasing the reliability of the entire system. The purpose of the present invention is to provide a wireless station monitoring method with improved performance.

(Structure of the Invention) The structure of the present invention is that in a radio station monitoring system in which there is a master station that accesses a slave station intermittently, an eavesdropping station that is not directly involved in the system between the master station and the slave stations is monitors the carrier transmitted by the master station, and when it does not receive the carrier of the master station for a certain period of time, it is determined that the master station has failed, and the intercepting station accesses the slave station by itself. It is characterized by having a tap function.

(Example) Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a professional diagram of one embodiment of the present invention. This embodiment shows a master station 1 that constantly accesses slave stations, and slave stations 11 to 1.
4 (there are four in the figure, but the number is not specified), and an interception station 2 that intercepts communications between the master station 1 and the slave stations 11 to 14.

Next, the operation of this embodiment will be explained. In the figure, master station 1 collects and controls data from slave stations 11 to 14 at intermittent time intervals.
Send instructions 21 to 24 and send the resulting data 31 to 34
At this time, the interception station 2 intercepts these and the communication data 51 to 54 and inputs the necessary data. In this state, the interception station 2 is also receiving the carrier 20 transmitted by the master station at the longest time interval.

Next, when the master station 1 fails and transmission becomes impossible, the intercepting station 2 accumulates the carrier-free reception period, and when it detects that the time interval has exceeded the predetermined maximum time interval, the intercepting station 2 determines that the terminal has failed, transmits control commands 41 to 44 to the slave stations 11 to 14, receives data 51 to 54 from the slave stations 11 to 14, and enters the pa, qua, or g mode. can. Furthermore, when the master station 1 becomes normal and the interception station 2 receives the carrier of the master station 1, the PA, QUA, and G modes are canceled and the normal system operation resumes.(Effects of the Invention) According to the present invention As explained above, since the interception station operates as backup, quad, and g when the master station fails, the overall system down rate can be lowered, and this system has practical value as a method for increasing reliability.

[Brief explanation of the drawing]

Figure fa1 is a professional diagram of an embodiment of a system using the monitoring method of the present invention. In the figure, 1... Master station, 2... Interception station, 11-1
4...Slave station, 20...Carrier of master station, 21-24...Control data to slave station, 31-
34... Data sent from the slave station, 41-44.
...Data from the interception station, 51-54...
...Data sent to the interception station 0 Figure f

Claims (1)

[Claims] In a wireless station monitoring system in which there is a master station that accesses slave stations intermittently, an interception station that is not directly involved in the system between the master station and slave stations monitors the carrier transmitted by the master station,
When the carrier of the master station is not received for a certain period of time,
A radio station monitoring system characterized in that the monitoring station has a backup function of determining that the master station has failed and accessing the slave station by itself.