JPH0376077B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides control for transmitting a control signal only to a specific receiver using a transmitter and a receiver. This invention relates to improvements in means for setting key codes for checking.

[Conventional technology]

In a conventional control device using a key code, a key code is set in advance on the transmitter side and the receiver side, respectively.
The transmitter side transmits the set key code, and the receiver side compares the set key code with the received key code to determine whether there is a predetermined relationship.

[Problem to be solved by the invention]

In such a control device, there is no particular problem if the key code is fixed and constant, or if it is set during production, but if it is set at the time of installation,
Changing the key code during use is cumbersome. In other words, the key code setting is performed by matching the key codes of each transmitter and receiver, but if the key code setting device is equipped with a large number of switches to prevent theft, it will be necessary to set the key code to a large number of receivers, which are the driven side. It is understandable that moving the data to a location where it is easy for users to operate and difficult to plagiarize increases wiring costs.

In a control device that uses a key code to confirm a partner, a technology for changing (setting) the key code on the receiver side based on a command from the transmitter side was published in Japanese Patent Application Laid-Open No. 1973-1983.
-Disclosed in Publication No. 48954. Although this change method has the advantage that the receiver side can be left unmanned, there is also a risk that the change may be made by a command from a fake transmitter, and if such a situation occurs, it is inconvenient that communication will not be possible from the real transmitter. There is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control device that can easily set a key code for a receiver without reducing the anti-theft function. In other words, the goal is to make it easy for users to do it, but to make it complicated (not easy) for non-users.

[Means to solve the problem]

The present invention includes a transmitting side key code setting device, a transmitter that transmits a signal including a key code set in the setting device, and setting a receiving side key code equal to the key code set in the transmitter. a receiving side key code setting means, and a receiver having a load control means for comparing the key code included in the received signal with the key code set in the receiving side key code setting means and controlling the load if they are equal. In the control device using a transmitter/receiver, the receiving side key code setting means includes a nonvolatile memory in which an input electrical signal can be written, and a receiver for controlling the nonvolatile memory to a write mode or a read mode. A changeover switch that is manually operated on the side, and a key code from the transmitting side that is included in the electric signal received only when the changeover switch is set to write mode, is given to the nonvolatile memory to write the key. The present invention is characterized in that circuit means for writing a code into the nonvolatile memory is provided.

[Effect]

The nonvolatile memory stores the key code included in the signal sent from the transmitter when the write mode is controlled by the changeover switch, and reads this when the read mode is controlled to verify the key code. Serve.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. The signal transmission method of the present invention can adopt a wired method that handles the base signal as it is, a wired method that modulates and demodulates the base signal, or a wireless method that uses ultrasonic waves or radio frequencies. It can be applied not only to equipment but also to data processing in display processing.

FIG. 3 is a circuit diagram of a transmitter of a control device according to the present invention, in which a vibrating element 1 made of crystal, ceramic, etc.
An oscillator constructed by combining the oscillator circuit 2 and the oscillator circuit 2 oscillates at an audible frequency to generate a clock signal for the counter 3. The counter 3 is a 5-bit binary counter, and the 4-bit outputs of QA to QD are connected to a decoder 4, where they are decoded into 15 outputs and the switch terminals of the key code setting device 5 are sequentially connected to the ground.

The signal 4A in FIG. 4 is the output QA of the counter 3.
shows the output timing of signals 4B, 4
Similarly, C, 4D, 4E have outputs QB, QC, QD,
It shows the QE output signal waveform.

NOR gate 6 outputs QE or output signal 4E
and the key code set in the key code setting device 5.
It uses NOR logic, and as shown in signal 4F in Figure 4, a high-level synchronization signal is output during period 7 when signal 4E is low level, and a key code signal is output during period 8 when signal 4E is high level. . The on/off setting of each switch terminal of the key code setting device 5 for setting the key code is performed by the operator in consideration of discrimination from other control devices, past usage history, etc. The output signal of the NOR gate 6 is sent to the receiver side via a driver (not shown) with a carrier such as a wire, radio frequency, or ultrasonic wave added thereto.

FIG. 1 is a circuit diagram of a receiver of the control device,
An output signal output from the transmitter is input to the input terminal 12. If the transmitter adds a carrier to the signal and transmits the signal, a reception front section (not shown) processes the waveform and transmits the signal.
It has the same form as the output signal 4F of the NOR gate 6, and the input signal is shown as signal 2A in FIG. The signal 2A is applied to the reset terminals of the hexadecimal counter 13 and the binary counter 14, the enable terminal of the hexadecimal counter 13, and the data terminal of the shift register 16.

The oscillator constructed by combining the vibration element 9 and the oscillation circuit 10 oscillates at a frequency 64 times that of the clock signal output from the oscillation circuit 2 of the transmitter, and the oscillation output is synchronized with the clock signal of the 11-bit binary counter 11. It is considered a signal. Counter 11 is QA~QK
(QA to QD are not shown), and the output QF
The signal 2B (Fig. 2) output from the transmitter has the same period as the clock signal (signal 4A in Fig. 4) output from the oscillation circuit 2 of the transmitter, and is output from the hexadecimal counter 16.
, the input terminal of AND gate 15 , and the clock terminal of shift register 16 . Note that the output QF of the binary counter 11 ~
The QK signal waveforms are shown as signal waveforms 2B to 2G in FIG. 2, respectively.

The hexadecimal counter 13 and the binary counter 14 are reset when the input signal 2A is at a low level, and when the input signal 2A becomes a high level, they count the signal 2B during the high level period. When the count value reaches 15, the output of the counter 13 becomes high level, and then the output QE of the counter 14 becomes high level.
The signal waveform of the counter output QE is the signal 2 in Fig. 2.
Denoted as I. The signal 2I is then applied to the counter 26 via the NOT gate 28, and the counter 26 is reset.

If the signal 2A input to the input terminal 12 corresponds to the output signal 4F sent from the paired transmitter, the signal 2A changes to low level at the next timing after period 7, As a result, the output signal 2I of the binary counter 14 changes to low level, so that the differentiating circuit C1,
The binary counter 11 is reset by R2 and R3. The timing is based on the output signal 4 of the transmitter.
This means that the F synchronization signal (corresponding to period 7) has been extracted. At this moment, the output signal of the NOT gate 28 goes high and provides a clock signal to the flip-flop 24.

The flip-flop 24 generates a control signal to control whether the receiver is in the key code write mode or the key code read mode.When the movable contact of the changeover switch 17 is turned to the open NML side, the flip-flop 24 takes in the high level signal of the data terminal and makes the output signal high level, and buffer drivers 18, 19, 20, 2
1 is made non-conductive to disconnect between the shift register 16 and the nonvolatile memory 23, and the R/W terminal of the nonvolatile memory 23 is set to high level to set the read mode, and the movable contact of the changeover switch 17 is grounded.
When the flip-flop 24 is tilted to the WRT side, the flip-flop 24 takes in the low level signal of the data terminal and sets its output signal to the low level, making the buffer drivers 18, 19, 20, and 21 conductive, and connecting the shift register 16 and the flip-flop 24 to the WRT side. The nonvolatile memories 23 are connected together, and the R/W terminal of the nonvolatile memory 23 is set to low level to set the write mode.

When the movable contact of the changeover switch 17 is turned to the ground WRT side and set to write mode,
When the synchronization signal is extracted and the aforementioned signal 2I from the binary counter 14 becomes high level and then changes to low level, the subsequent input signal 2A becomes the subsequent output signal 2B of the output QF of the binary counter 11.
The signal is sampled and taken into the shift register 16. When 4 bits are taken in, AND gate 1
5's output signal 2H (Fig. 2) becomes high level,
The signal is applied to the nonvolatile memory 23 as an enable signal via the NOR gate 22, and the data from the shift register 16 is transferred to the binary counter 11.
The signals 2E and 2F of the outputs QI and QJ are written into the nonvolatile memory 23 as address signals.

Data sampling and writing are similarly performed in 4-bit units for the data of the input signal 2A that subsequently comes in, and a total of 16 bits of data is stored in the nonvolatile memory 23 as a key code.

When writing this key code, switch 17
The AND gate 27 is closed by the low level signal from the output terminal 29, and the load control signal is not output from the output terminal 29.

After setting the key code in the receiver in this manner, when the control device is to be put into the load control state, the movable contact of the changeover switch 17 is turned to the open NML side. In this state, when the synchronization signal is extracted as described above, the output of the flip-flop 24 becomes high level, and the buffer drivers 18, 19, 20, 21
is made non-conductive, and R/ of the nonvolatile memory 23 is made non-conductive.
The W terminal is placed in read mode.

In this state, as described above, the output data of the shift register 16 obtained by sampling the input signal 2A that subsequently comes in after the synchronization signal in units of 4 bits, and the output signal 2 of the outputs QI and QJ of the binary counter 11
Non-volatile memory 2 using E and 2F as address signals
The key code data read from 3 is sent to comparator 2.
5, the comparison (verification) is performed to confirm the match. If they match, a match signal is given as an enable signal to the quinary counter 26, and the AND gate 15
The output signal 2H of is counted. 4 times (16 bits)
When they match consecutively, the quinary counter 26 outputs a high level signal, and this signal is output via the AND gate 27 to the output terminal 29 as a load control signal. If they do not match, the output signal of the quinary counter 26 will not go to high level.
A load control signal is not generated as it is not an input signal from a paired transmitter.

According to the above-mentioned control device, the key code that was conventionally created by operating switches in the transmitter and receiver and setting on and off signals of 10 or more points separately and matching. , just by operating one switch 17 on the receiver side,
It can definitely be set the same as on the transmitter side, improving operability. In addition, selector switch 1
7 is easy to wire because only a single circuit needs to be opened and closed, and therefore it is easy for the user to operate it, but it can be installed in places where it cannot be operated by anyone else (for example, in a place where only the user cannot enter). It can be easily installed in a location where it cannot be discovered by anyone other than the user. The key code to be set in the receiver is set on the transmitter side, but at the time of setting, it is necessary to operate the changeover switch 17 on the receiver side as described above. If you consider the location, you can maintain a sufficient anti-theft function.

As the non-volatile memory 23 described above, it is preferable to use battery-backed RAM (random access memory).
INTERNATIONAL)'s electrical curry
ELECTRICALLY ALTERABLE READ
ONLY MEMORY) If you use ER2050 etc.
There is no need to consider backup battery when using RAM, and it is effective in dealing with long-term power outages and power interruptions.

〔Effect of the invention〕

In the present invention, when setting a key code or changing a preset key code, by setting the key code setting switch on the transmitter side, the receiver side receives the key code sent from the transmitter. It is sufficient to operate the changeover switch so as to memorize the key code, which simplifies the operation and eliminates erroneous setting of the key code. Moreover, such a changeover switch is 1
The wiring system is simplified because only one switch is required.
Therefore, it becomes easy to install the changeover switch in a place where it is easy for the user to operate it and cannot be operated by anyone else. The receiver will not memorize the key code sent from the transmitter unless the switch is operated, so even if the thief has the transmitter, he or she can set the key code in the receiver using only remote control. Therefore, the plagiarism prevention function does not deteriorate.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is an electrical circuit diagram of the receiver, Fig. 2 is an operating signal waveform diagram thereof, Fig. 3 is an electrical circuit diagram of the transmitter, and Fig. 4 is its electrical circuit diagram. FIG. 3 is an operation signal waveform diagram. 5... Key code setting device, 11... Binary counter, 13... Hexadecimal counter, 14... Binary counter, 16... Shift register, 17... Changeover switch, 18-21... Buffer driver, 2
3...Nonvolatile memory, 25...Comparator.

Claims (1)

[Claims] 1 A transmitter having a transmitting side key code setting device and transmitting a signal including the key code set in the setting device, and a receiving device that sets a receiving side key code equal to the key code set in the transmitter. side key code setting means, collating the key code included in the received signal with the key code set in the receiving side key code setting means;
In a control device using a transmitter/receiver including a receiver having a load control means for controlling the load when the load is equal, the receiving side key code setting means includes a non-volatile memory capable of writing input electrical signals; , a changeover switch that is manually operated on the receiver side to control the nonvolatile memory to write mode or readout mode, and included in the electrical signal received only when the changeover switch is set to write mode. 1. A control device using a transmitter/receiver, further comprising circuit means for applying a key code from a transmitting side to the nonvolatile memory and writing the key code into the nonvolatile memory.