JPH0357327A - Wireless monitoring equipment - Google Patents

Abstract

PURPOSE:To smooth a transmission output from plural equipments without occupancy of transmission by one equipment by providing a transmission output instruction section and retarding a succeeding transmission start time until the setting time of a counter elapses. CONSTITUTION:The monitoring signal of an equipment 1 is inputted to a monitoring input section 2, binarized in response to the operation or stop state, and a coding section 3 generates a communication packet depending on a set address or communication code when monitoring information changes. Then a transmission section 4 uses a high frequency signal such as a VHF as a carrier to apply radio transmission of the communication packet by applying FM modulation or the like. In this case, a transmission output instruction section 8 counts the transmission time when the transmission section 4 is in the transmission output state, a product between a preset numeral and a counted transmission time is set to a decremental counter, in which the subtraction is started. When the succeeding communication packet is generated in the coding section 3 during the subtraction, the transmission is delayed till the end of subtraction count. Thus, one equipment does not occupy the transmission and the transmission output from plural equipment is smoothed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 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. 4, an input signal input from a device 1 is digitized or binarized at a monitor input section 2. In the encoding unit 3,
When the monitor information value digitized or binarized by the monitor input unit 2 changes, an address, a communication control code, etc. are added and the communication packet is processed. The transmitter 4 transmits the transmitted communication packet using UHF or VHF radio waves as a carrier wave. Therefore, as soon as the input signal from device L changed, a transmission output was generated. Problems to be Solved by the Invention However, in the above-mentioned system, a transmission output is immediately emitted when monitor information changes, so if one wireless monitor device frequently emits a transmission output, other wireless monitor devices may The problem was that information could not be obtained. The present invention solves this conventional problem, and by providing a transmission output delay time from the end of transmission to the next signal, it prevents one wireless monitor device from monopolizing the transmission and allows the transmission of signals from multiple wireless monitor devices. The purpose is to enable smooth transmission output. ! ! ! Above are the ways to solve the problem! ! In order to solve this problem, the wireless monitor device of the present invention counts the time during the transmission output, and does not issue the next transmission instruction until the product of the counted time and the set value n has elapsed since the end of transmission 3. It is equipped with a transmission output instruction section that delays output. According to the above-described structure, the present invention measures the transmission time T by the transmission output instruction section when a transmission output is generated, and calculates the product of the transmission time T and a preset value n. When the transmission is completed, the product value nT is set in the timer and subtraction counting begins. If the next communication packet is generated during the subtraction count, the start of transmission will be delayed until the count ends. Therefore, even if transmission packets are generated frequently, once a transmission is issued, the nT calculated by the settings will continue until the next transmission.
Since the user has to wait for a certain amount of time, the transmission time can be limited to a certain percentage. EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figure 1 shows an example of an application system for the wireless monitoring device of the present invention. The monitor signal from the machine H1 is input to the wireless monitor device 5, and the monitor signal from the machine H1 is input to the wireless monitor device 5.
It is valued. When the binarized monitor information changes, a communication packet is generated by adding the self address, communication control code, and check code, and is transmitted to the receiver 6. The receiver 6 uses a check code to check whether the received communication packet has been received correctly, and if it has been received correctly, sends its own address and monitor information to the monitor display section 7. The monitor display unit 7 displays the display contents of the part where the preset address and the self address match.
Change to the received monitor information. Through the series of operations described above, the plurality of wireless monitor devices 5 display the operation and stop states of the connected devices 1 on the monitor display section 7 located at a remote location. Figure 2 is a circuit block diagram of the wireless monitor installation of the present invention. #! The monitor signal of the device 1 is input to the monitor input section 2, and is converted into a binary value corresponding to the running or stopping state. When the monitor information changes, the encoder 3 encodes the communication packet using the set address, communication code, monitor information, and check code. 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. The transmission output instruction section 8 counts the transmission time while the transmission section 4 is outputting the transmission. When the transmission is output, the product of the preset value n and the counted transmission time T is set in the subtraction counter and subtraction begins. If the next communication packet is generated in the encoder 3 during the ifi calculation, the transmission is delayed until the i1X count ends. FIG. 3 is a transmission timing diagram of the wireless monitor device of the present invention showing the above operation. The number 4 inches to be multiplied by the transmission time T is set by a dip switch or the like, and is increased in proportion to the number of wireless monitor devices t5, for example. Due to the above precautions, even if the state of the equipment changes frequently and communication packets are constantly generated, once a transmission output is issued, the next transmission will have to wait for nT time. Therefore, it is possible to prevent one wireless monitoring device from monopolizing transmission. In addition, by setting the number {In according to the wireless monitor installation or failure, the transmission time can be shared efficiently. According to the wireless monitor device of the present invention, as described above, the effects of the invention are as follows.
Since a transmission output instruction unit is provided that delays the next transmission start time until the product of the transmission time T and the set value n has elapsed from the end of transmission, even if an application system is configured with multiple wireless monitor devices, only one Without having one wireless monitor device monopolizing the transmission, it is possible to limit the transmission time to a set percentage or less, and mutual transmission can be performed smoothly.

[Brief explanation of drawings]

Fig. 1 is a system diagram of a wireless monitoring device according to an embodiment of the present invention, Fig. 2 is a circuit block diagram of the same device, Fig. 3 is a transmission timing diagram of the same device, and Fig. 4 is a diagram of a conventional wireless monitoring device. This is a circuit block diagram.

Claims (1)

[Claims] a monitor input section that digitizes the input signal; an encoder section that generates a communication packet by adding address information when the monitor information digitized by the monitor input section changes; and a coding section that generates a communication packet by adding address information; A transmission output instruction unit that causes the next transmission instruction output to be sent until the time has elapsed by the product of the value n, and when a communication packet is generated, the communication packet is synchronized with the transmission output from the transmission output instruction unit. A wireless monitor device consisting of a transmitter that transmits using radio waves.