JPS61123242A - Switching system of polling system telemeter transmitter - Google Patents

Abstract

PURPOSE:To arrange the degree of deterioration of transmitters due to elaps of time by using switchingly transmitters of a radio equipment at each prescribed cycle when a master station calls slave stations in applying polling the 1:N system telemeter by means of duplicated radio equipments. CONSTITUTION:The radio equipment for a master station telemeter equipment 1 is duplicated, and transmitters No1, 2 and receivers No1, 2 are provided. Eitherj the transmitter No1 or the No2 is used by using changeover switches 4-1, 40-2 and a polling signal is transmitted to slave stations 6-1-6-3. Each slave station detects that the own station is called to transmit a data to the master station 1, which receives it to completeone cycle of telemeter. When a fault is detected 3, the transmitter is switched automatically to other transmitted in standby and when no fault exists, the transmitters are changed over automatically at each prescribed cycle of telementer. Thus, the deterioration of the transmitters due to elapsed time is arranged to improve the reliability of system. In case of a large power transmitter, the effect is enhanced especially.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polling telemeter device using a wireless device.

In order to collect data from sensors installed in remote locations, it is common practice for a single master station telemeter device to call multiple slave station telemeter devices in succession in a fixed order to collect data from the sensors. There is.

[Conventional technology]

The conventional technique will be explained using FIG. In the figure, 1 is a master station telemeter device, 2 is a wireless device, 2-1.2-2 is a transmitter, 2-3.2-4 is a receiver, 3 is a failure detection circuit,
4-1.4-2 is a changeover switch, 5 is an operation console, 6-1~
6-3 is the transmitter 2 by the slave station telemeter device 1.
-1 is used to call the slave station telemeter devices 6-1 to 6-3, and the signals sent from the slave station telemeter devices 6-1 to 6-3 are received by the receiver 2-3.2-4. and sends it to the master station telemeter device l.

At this time, if the transmitter 2-1 or 2-2 of the wireless device 2 fails, the failure is detected by the failure detection device 3, or
When the switch on the console 5 is manually switched, the transmitter is switched from 2-1 to 2 using the switch 4-1 and 4-2.
-2 or from 2-2 to 2-1.

[Problem that the invention seeks to solve]

When using a polling telemeter like the one above, the transmitter of the wireless device is switched only when the transmitter in use breaks down or when there is a manual switching operation from an intercom console, etc., so the slave station When making continuous telemeter calls, only one transmitter is always in operation, which has the disadvantage of significantly shortening the lifespan of the transmitter in use and deteriorating its reliability.

The above drawbacks tend to become more noticeable as the transmitter has a higher output.

[Means for solving problems]

In order to solve the above problems, in the present invention, a switching command device is provided to change the transmitter of the duplicated master station to the transmitter of the wireless device every fixed cycle for calling the slave station. I made it switch alternately.

[For production]

In order to prevent the transmitter from operating beyond its rated time and being damaged, the above polling type telemeter uses a switching command device to count the polling cycle so that the transmission time of only one transmitter does not become too long. By replacing the transmitter at regular intervals, he made a polling-type telemeter device using a high-output transmitter practical.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram for explaining the present invention in detail, in which 1 is a master station telemeter device, 2 is a wireless device, 2-1.2
-2 is a transmitter, 2-3.2-4 is a receiver, 3 is a failure detection circuit, 4-1.4-2 is a changeover switch, 5 is an operation console, 6
-1 to 6-3 are slave station telemeter devices. Figure 2 shows
It is a flowchart of a switching command part.

The operation will be explained below according to the flowchart.

First, the master station telemetry device 1 issues a transmission request. At the master station telemeter, the radio transmission cycle counter is reset and the initial value is set to zero according to the flowchart in FIG. 2, and the radio is put into use.

In the wireless device 2, first, the transmitter 2-1 transmits a polling signal to the slave station telemeter devices 6-1 to 6-3 to call the slave stations.

The signal from the slave station is received by the receiver 2-3.2-4 and sent to the master station telemeter device 1. The operation up to this point is one cycle. In the next cycle, the radio is in use, so the radio transmission cycle counter counts up by 1".Then, until N reaches the designated number of radio switching times K,
Polling continues with transmitter 2-1.

When the designated number of radio switching times K is reached, the transmitter is switched from 2-1 to 2-2 according to the flowchart in Figure 2, and the transmitter 2 is switched from 2-1 to 2-2.
-Turn off the power to 1.

In this way, the transmission is switched from tJ312-1 to 2-2.

Further, if a failure occurs in the transmitter 2-1 or 2-2, the command from the switching command unit of the master station telemeter device is ignored, and the failure detection circuit switches to the transmitter that is not in failure. This is the same when operating from the console 5, and manual switching commands from the console 5 are given priority.

[Effects of the Invention] □ In the present invention, in a telemeter device that continuously calls each slave station and uses a polling method, the number of polling cycles is counted and a transmitter provided for backup is used. By alternately switching the transmitter every specified number of cycles, it is possible to prevent a decrease in the life of the transmitter and improve reliability.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the polling telemeter transmitter switching method of the present invention, Fig. 2 is a flowchart of a switching command device for the polling telemeter transmitter switching method of the present invention, and Fig. 3 explains a conventional example. FIG. In the figure, 1 is a master station telemeter device, 2 is a wireless device, 2
-1.2-2 is 2-3.2-4 is the receiver, 3 is the failure detection circuit, 4-1.4-2 is the changeover switch, 5 is the operation console/#
+6-1 to 6-3 indicate slave station telemeter devices, respectively.

Claims (1)

[Claims] When using a 1:N telemeter using a polling method using a duplicated wireless device, the transmitter of the wireless device is automatically switched alternately every certain cycle when the master station calls the slave station. A polling telemeter transmitter switching system featuring: