JPH02162895A - Wireless control system with check code - Google Patents

Abstract

PURPOSE:To eject an unjust control by means of a third party by adding a check code generator with a current time as an argumant respectively to a control transmission station side and a control receiving station side, and collating the check codes added to control signals. CONSTITUTION:By a current time 4 outputted from a clock device 1 and a random number pattern 5 outputed from a random number generator 2, a check code 6 is generated by a fixed operation by means of a check code arithmetic unit 3. The random pattern 5 to be used is made the same for the control transmitting station side and the control receiving station side, and the both stations generates the same check codes at the same time. The control transmitting station side transmits the control signal added with the generated check code 6, the control receiving station side compares the check code added to the transmitted control signal with the check code generated in its own station, and the correctness of the control signal is determined by the collation coincidence of the check codes. Thus, a control operation caused by a noise signal other than a control command can be ejected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to remote control using a wireless line, and particularly to a check code added wireless control system that verifies the validity of a control signal using a check code.

[Conventional technology] Conventionally, in remote control using wireless lines.

The control transmitting station modulates the control signal to a frequency specified by the system as the radio frequency to be used and transmits it, and the control receiving station demodulates the transmitted control signal and then performs various control operations depending on the content of the control signal. I am doing it.

[Problems to be Solved] Due to the nature of the wireless medium, the conventional system described above does not require any control commands from the control receiving station as long as the radio frequency and control signal are the same, even if the control command is not from the original control transmitting station. There is a problem in that control operations are executed without checking.

The present invention has been made in view of the above-mentioned problems, and provides a check code added radio control system that prevents a control receiving station from performing control operations due to noise signals other than control commands from an original control transmitting station. With the goal.

[Means for solving the problems] In order to achieve the above object, the check code addition radio control system of the present invention adds a check code generator using the current time as an argument to each of the control transmitting station side and the control receiving station side, The control transmitting station transmits a control signal with a check code generated by the check code generator, and the control receiving station transmits the check code added to the transmitted control signal in its own station. The control signal is compared with a generated check code, and the validity of the control signal is determined by checking and matching the check code.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an example of a check code generator. This check code generator.

It is composed of a clock device 1, a random number pattern generator 2, and a check code calculation unit 213.

The check code 6 generated by this device is based on the current time 4 output from the clock device 1 and the random number pattern 5 output from the random number pattern generator 2.

The check code calculation unit 213 performs certain calculations to generate the check code.

The random number pattern 5 used here is the same pattern on both the control transmitting station side and the control receiving station side, and both stations generate the same check code at the same time.

FIG. 2 is a block diagram of the main parts of the control transmitting station using the check code generator J& device, in which 7 is a synthesis device and 8 is a check code generator. The check code generator 8 is the first
It has the configuration shown in the figure.

On the control transmitting station side, the control V4 signal 9 to be transmitted is combined with the check code IO output from the check code generator 8 by the combining device 17, and the combined output signal 11 is output. This composite output signal 11 is modulated and becomes a wireless output.

Figure 3 is a block diagram of the main parts of the control receiving station using the check code generator.
is a check code generator, 14 is a gate device, and 15 is a comparator. The check code generator 13 has the configuration shown first.

On the receiving control station side, the demodulated received signal 16 is separated into a control signal 17 and a check code 18 by a separation device 12. On the other hand, check code 19 is output from check code generator 13, and these two signals 18.1
9 is compared by the comparator 15. When the comparison results of both signals 18 and 19 match in the comparator 15, the gate unit 14 outputs the control signal 17 as a control signal 21 to the subsequent stage device based on the match signal 20.

[Effects of the Invention] As explained above, the check code addition radio control system of the present invention adds a check code generator using the current time as an argument to each of the control transmitting station side and the control receiving station side, and The check code added to the control signal transmitted from the transmitting station side is compared with the check code generated by the control receiving station, and the validity of the control signal is checked based on the comparison of the check codes. This has the effect of preventing the control receiving station from performing a control operation due to a signal emitted from a device that does not have the same check code generator as the control receiving station. This has the effect of eliminating unauthorized control from third parties in systems that are similar to public facilities or that are dangerous and have a large social impact (public broadcasting equipment, control of various plants).

[Brief explanation of the drawing]

FIG. 1 shows a chain used in the control system according to the present invention. FIG. 2 is a block diagram of the main part of the control transmitting station side, and FIG. 3 is a block diagram of the main part of the control receiving station side. 1: Clock device 2: Random number pattern generator 3: Check code calculation device 4: Current time 5: Random number pattern 6: Check code 7 Two synthesis device 8.13: Check code generator 9.17: Control signal 10: Check code 11: Combined output signal 12 Two-way separator a 14: Gate device 15: Comparator 16: Received signal 18. 19 Nichijoku Code 20 Match signal Agent Patent attorney Kihei Watanabe

Claims (1)

[Claims] In remote control of equipment by wireless, a check code generator using the current time as an argument is added to each of the control transmitting station and the control receiving station, and the check code generator generates a control signal from the control transmitting station. The generated check code is added and transmitted, and the control receiving station side compares the check code added to the transmitted control signal with the check code generated by its own station to determine the validity of the control signal. A check code addition wireless control method is characterized in that it is performed by checking and matching.