JPH03201631A - Wireless monitoring equipment - Google Patents

Abstract

PURPOSE:To reduce the congestion of transmission by the change of sensor information by providing transmission inhibiting time until the next transmission instruction after outputting the transmission instruction when the amount of the change from preceding transmission data is smaller than a set value, and immediately executing transmission when the change amount gets larger than the set value. CONSTITUTION:A transmission instruction part 8 is provided to inhibit the transmission instruction for the set time when the value of an input signal to be digitized by a monitoring input part 2 is not changed more than the set value after outputting a transmission instruction signal. The input signal is sampled and digitized every fixed time by the monitoring input part 2 and the digitized value is compared with the value at the time of the preceding transmission instruction signal output. Unless the value gets larger than the change amount set in advance, the output of the transmission instruction signal is inhibited for the set time. Thus, when the input signal is not widely changed in a short time, the next transmission is set after the lapse of the set time in the case of once executing the transmission, and the transmission can be prevented from being occupied by the frequent transmission of one wireless monitoring equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wireless monitor device that transmits monitor information using radio waves.

2. Description of the Related Art In a conventional wireless monitor device, as shown in FIG. The input signal inputted from the monitor input unit 2 is digitized at regular intervals.

In the encoding unit 3, when the value digitized by the monitor input unit 2 changes, an address, a communication control code, etc. are added and a communication packet is generated. The transmitter 4 transmits the generated communication packet using UHF or VHF radio waves as a carrier wave.

Therefore, when the input signal value from the sensor 1 changes, a transmission output is generated at regular intervals.

Invention tries to solve! However, in the above configuration, when the input signal changes, a transmission output is generated at each sampling time, so one wireless monitor device frequently generates a transmission output, and the information from other wireless monitor devices is The problem was that it was not possible to obtain

The present invention solves this conventional problem, and prevents one wireless monitor device from monopolizing transmission by prohibiting transmission instructions until a set time elapses from the previous transmission instruction if the amount of change is within a set value. The purpose is to prevent this problem and enable smooth transmission from multiple wireless monitor devices.

Means for Solving the Problems In order to solve the above problems, the wireless monitoring device of the present invention provides that, after outputting a transmission instruction signal, if the value of the input signal digitized by the monitor human power section does not change by more than a set value, A transmission instruction unit is provided that prohibits transmission instructions for a set time.

Operation According to the present invention, the input signal is sampled at regular intervals and digitized by the monitor input section using the above-described configuration. The digitized value is compared with the previous transmission instruction signal output value, and the output of the transmission instruction signal is prohibited for a set time unless the change exceeds a preset amount of change.

Therefore, if the input signal does not change significantly in a short period of time, 1
Once a transmission is issued, the next transmission will occur after the set time has elapsed, thus preventing one wireless monitoring device from monopolizing the transmission by frequent transmissions.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. FIG. 1 is an example of an application system of the wireless monitor device of the present invention. The input signal from sensor l is input to wireless monitor device 5 and digitized. A communication packet is generated by adding a self address, a communication control code, and a check code to the digitized input signal value, and the communication packet is transmitted to the receiver 6.

In reception m6, a check code is used to check whether the received communication packet/node has been received correctly, and if it has been received correctly, the self address and digitized data value are sent to the monitor display section 7.

The monitor display section 7 changes the display data to the received data value when the preset address and the sent own address match. Through the series of operations described above, the plurality of wireless monitor devices 5 digitize the input signals from the sensors l connected to each one and display them on the monitor display section 7.

FIG. 2 is a circuit block diagram of the wireless monitor device of the present invention. The input signal from the sensor 1 is sampled and digitized by the monitor input section 2 at fixed time intervals Ts. When the digitized input signal value changes, the encoder 3 generates the set self address, 1llll communication control code, input data from the sensor 1, and check code to create a communication packet. The transmitter 4 uses a high frequency signal such as a VHF wave or a UHF wave as a carrier wave, and performs wireless transmission of communication packets by applying FM modulation or AM modulation. If the amount of change from the digitized input signal value when outputting the transmission instruction signal last time is smaller than the set value, the transmission instruction section 8 outputs the transmission instruction signal until the transmission instruction prohibition time T elapses. I don't give out. If the amount of change is greater than the set value, a transmission instruction signal is immediately output to the transmitter 4.

FIG. 3 is a transmission timing diagram of the wireless monitor device of the present invention showing the above operation. The input signal is sampled and digitized every Ts. If the amount of change is smaller than D, the transmission instruction output for time T is not output, and if the amount of change is greater than D, the transmission instruction signal is immediately output.

With the above configuration, when the amount of change is small, the transmission interval is increased, and when the amount of change is large, it is sent immediately, so it is possible to reduce the frequency of transmission due to changes in sensor information and to prevent sudden changes in data. This can reduce the negative effects of delayed response.

According to the wireless monitor device of the present invention, as described above, the effects of the invention are as follows.
If the amount of change from the previously transmitted data is smaller than the set value, a prohibition period is set after the transmission instruction is output until the next transmission instruction is set, and if the change is larger than the set value, a transmission instruction section is provided that immediately sends the data. Even if an application system is configured using multiple wireless monitoring devices, transmission congestion due to changes in sensor information can be reduced, and sudden changes can be prevented.
The negative effects of display delay can be reduced.

[Brief explanation of drawings]

FIG. 1 is an application system block diagram of a wireless monitor device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the wireless monitor device, FIG. 3 is a transmission timing diagram of the wireless monitor device, and FIG. The figure is a circuit block diagram of a conventional wireless monitor device. 2...Monitor input section, 3...Encoding section, 4...Transmission section, 8...Transmission instruction section.

Claims (1)

[Claims] a monitor input section that samples an input signal from the sensor at regular intervals and converts it into a numerical value; an encoding section that generates a communication packet to transmit the value digitized by the monitor input section as data; and the monitor input section. If the value digitized by the unit is within the set value compared to the value when the transmission instruction signal was output last time, the transmission instruction unit prohibits the transmission instruction signal for the set time and transmits the communication packet by radio waves using the transmission instruction signal. A wireless monitor device consisting of a transmitter that starts transmission.