JPS6226070B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a terminal control method that improves the accuracy of terminal adjustment control.

A conventional terminal control system will be explained with reference to FIGS. 1 and 2.

In FIG. 1, an "open" or "close" signal from a control operation button 1 of a master station P is encoded by a coding circuit 2, converted into a serial bit signal by a parallel-to-serial conversion circuit 3, and inputted to a modulation circuit 4.

The modulation circuit 4 sends out a carrier wave modulated by the input serial bit signal to the transmission path.

At the terminal T, the received carrier wave is demodulated by a demodulation circuit 5, converted into a parallel code signal by a serial-to-parallel conversion circuit 6, and stored in a storage device 7.

The output from the storage device 7 is decoded by the decoding circuit 8 and inputted to the valve drive circuit 9 as valve "open" and "close" signals.

This valve is driven by a motor, which is rotated by "close" and "close" signals.

That is, when the "open" signal is received continuously, the motor rotates in the normal direction and the opening degree of the valve gradually increases.

Next, when the reception of the "open" signal stops, the motor stops and the valve remains open.

Further, when the "close" signal is received continuously, the motor rotates in reverse during that time, and the degree of valve closing becomes smaller and smaller.

Next, when the reception of the "close" signal stops, the motor stops and the valve remains open.

A conventionally used control method will be explained with reference to FIG.

When the control operation button 1 is not outputting either an "open" or "close" signal, the carrier wave FS modulated by the synchronizing signal word SYN in the code string C is sent out to the transmission path.

While the synchronization signal word SYN is being received at terminal T, the decode output DC is “O” and “open”.
There is no “close” signal output and the motor is stopped.

Next, when an "open" or "close" signal is issued from the operation button 1, the control signal word Tcw of the "open" or "close" signal is modulated and sent out.

Upon receiving the control signal word Tcw at terminal T,
Decode output DC is “open” or “close” control signal
Outputs TC to rotate the motor forward or reverse.

Next, to stop "open" or "close", when the "open" and "close" signals of the operation button disappear, the synchronization signal word SYN is sent at timing _T2 after the word transmission waiting time T, ₁ , and decoded. The output DC becomes "O" and the motor stops here. After this, SYN continues to be sent to prevent synchronization.

As described above, in the conventional method, the time T ₁ +T ₂ was required to stop the motor.

This resulted in poor control accuracy for stopping the terminal.

The present invention aims to eliminate such drawbacks, and the purpose is to provide a terminal control system that controls the operation of a terminal by transmitting a control signal modulated by a carrier wave from a master station to the terminal. In this method, control is started by sending coded control signals and synchronization signals as serial bit signals to the terminal, and when control is stopped, the master station stops transmitting carrier waves,
This is achieved by a terminal terminal control method characterized in that the delay time until the control is stopped is shortened by stopping the operation of the terminal by detecting a loss of reception of a carrier wave at the terminal.

EMBODIMENT OF THE INVENTION The control system of this invention is demonstrated in detail based on an Example below.

FIG. 3 is a diagram showing one embodiment of the present invention. In the figure, 10 is a stop detection circuit that detects the completion of "open" or "close" control, and 11 is a stop detection circuit that controls the time for stopping transmission of carrier waves. 12 is a detection circuit for detecting that the carrier wave is disconnected, and the same circuits as in FIG. 1 are given the same reference numerals.

In the case of "open" or "close", the operation is the same as that in FIG. 1, so the explanation will be omitted.

When controlling and stopping the "open" or "close" operation, the stop detection circuit 10 detects that the "open" or "close" signal from the control operation button 1 has ended.

When the control circuit 11 receives the signal from the stop detection circuit 10, the control circuit 11 inputs a signal that cuts off the carrier wave to the modulation circuit 4 until it detects that the parallel-to-serial conversion circuit 3 sends out the synchronization signal word SYN. do.

This causes the modulation circuit 4 to stop transmitting the carrier wave.

In the terminal, a detection circuit 12 detects whether a carrier wave is input to the demodulation circuit 5 or not.

When the detection circuit 12 detects that the carrier wave is no longer input, it resets the storage contents of the storage device 7.

By this reset, the output from the storage device 7 is
All “0” and “0” information is sent to the decoding circuit 8
The signal is input to the drive circuit 9 via.

This stops the "opening" or "closing" operation of the valve.

The above will be explained using FIG. 4.

When the carrier wave is interrupted for a time t due to the output from the control circuit 11, in the terminal T, when the detection circuit 12 detects the carrier wave interruption, the decode output DC becomes "0".
Therefore, the valve drive stops immediately.

After time t when the carrier wave is cut off, the carrier wave modulated with the synchronization signal word STN is sent out again in order to achieve synchronization, and the decoded output DC continues to be
Outputs “0”.

As described above, according to the present invention, the carrier wave is cut off when performing the stop control, so compared to the conventional method, the "open" or "close" control is completed before the actual stop is performed. This makes it possible to shorten the time it takes.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are diagrams for explaining a conventional control method. FIGS. 3 and 4 are diagrams for explaining the control method according to the present invention. In the figure, 1 is a control operation button, 2 is a coding circuit,
3 is a parallel-to-serial conversion circuit, 4 is a modulation circuit, 5 is a demodulation circuit, 6 is a serial-to-parallel conversion circuit, 7 is a storage device, 8 is a decoding circuit, 9 is a valve drive circuit, 10 is a stop detection circuit, 11 is a control circuit , 12 is a detection circuit.

Claims (1)

[Claims] 1. In a terminal control method in which the operation of a terminal is controlled by transmitting a control signal modulated with a carrier wave from a master station to a terminal, activation of control is performed using a coded control signal. This is done by sending a synchronization signal as a serial bit signal to the terminal, and when control is stopped, the master station stops transmitting the carrier wave,
A terminal control method characterized by shortening the delay time until control stops by stopping the operation of the terminal by detecting loss of reception of a carrier wave at the terminal.