JPH0483498A - Remote control communication circuit - Google Patents

Abstract

PURPOSE:To match transmitting/receiving timing between a remote controller and an equipment and to execute accurate remote control communication by obtaining the receiving and transmitting timing of the equipment side based on an interruption signal added prior to a data signal transmitted from the remote controller to the equipment side. CONSTITUTION:A signal outputted from the output port OUT of a microcomputer 6 in the remote controller 1 side is inputted to a comparator IC1 in the apparatus 2 through a serial signal line 10a by the action of a transistor TR3. Two continuous interruption signals are added prior to a data signal transmitted from the remote controller 1 and inputted to the interruption signal input port INT of a microcomputer 3. The microcomputer 3 finds out a time (t) corresponding to one bit, stores the time (t) in a memory and sets up the transmitting and receiving timing of the equipment 2 side in accordance with the time (t). Consequently, the output timing of the transmitting side can surely be matched with the reading timing of the receiving side.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a remote control communication circuit, and more specifically,
The present invention relates to means for eliminating timing deviations in transmission and reception of a wired remote control device.

[Conventional technology]

A wired remote control device a used in equipment such as air conditioners consists of a remote control, a device side controlled by the remote control, and a signal line that connects the two.The device side includes a microcomputer that controls the operation of a compressor, etc. , a receiving circuit that receives signals from the remote controller, and a transmitting circuit that sends signals from the microcomputer to the remote controller.On the other hand, the remote controller includes a microcomputer for input control, and a signal from the microcomputer to the equipment side. It consists of a remote control transmitting circuit that transmits signals, a remote control receiving circuit that receives signals from the equipment side, and a constant voltage circuit section that converts the DC voltage supplied from the equipment side to a predetermined value. In addition to the signal line,
The power line and ground line are connected, and serial signals are transmitted and received in both directions.

[Problem to be solved by the invention]

However, in the case of the wired remote control device described above, the output timing of the serial signal on the transmitting side and the receiving side may vary due to clock errors between the remote control side and the device side, errors occurring in other circuits, and errors in the clocks caused by temperature changes. A "shift" may occur in the read timing, and this "shift" is particularly likely to occur in the case of a long signal, and if the read timing is shifted by one bit or more, a problem arises in which the input signal data is erroneously decoded on the receiving side. do.

Therefore, an object of the present invention is to provide a remote control communication circuit that can solve these problems and reliably match the output timing on the transmitting side and the reading timing on the receiving side.

[Means to solve the problem]

The present invention has been made to solve the above-mentioned problems, and provides a remote control communication circuit that transmits and receives data in the form of serial signals between a remote control and a device controlled by the remote control via a signal line or the like. Two consecutive interrupt signals are added before the data signal transmitted from the remote control side, and the device that receives the interrupt signal receives the 2 bits from the first interrupt signal to the second interrupt signal. The time corresponding to one bit is determined from the time in minutes, and the timing of reception and transmission on the equipment side is set in accordance with the time corresponding to one bit.

[Operation] With the above configuration, the device side can determine the accurate time for one bit of the data signal from the two consecutive interrupt signals added before the data signal from the remote control. By adjusting the timing of reception and transmission on the device side in accordance with the determined time for one bit, the timing of transmission and reception between the remote control and the device side can be matched.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2.

Figure 1 is a circuit diagram of a wired remote control device, where 1 is a remote controller, and 2 is a circuit 11a that is connected by the remote controller 1.
Shows the vessel side.

The equipment side 2 controlled by the remote controller 1 includes a microcomputer 3 (not shown) that controls the operation of a compressor, etc., a transmitting circuit 4 that transmits signals from the microcomputer 3 to the remote controller 1, and a transmitter circuit 4 that transmits signals from the remote controller 1. The remote control 1 includes a receiving circuit 5 for receiving data, and a microcomputer 6 for controlling input.
A remote control transmitting circuit 7 transmits a signal from the microcomputer 6 to the device side 2, a remote control receiving circuit 8 receives a signal from the device side 2, and a DC voltage (12V) also supplied from the device side 2 is connected to a predetermined voltage. There is a constant voltage circuit section 9 that converts the voltage to a value (5V), and the remote control 1 and the device side 2 are connected by a serial signal line 10a, a power line 10b, and a ground line 10c.
Transmission and reception of serial signals is performed between the two directions.

The signal from the output port OMIT of the microcomputer 6 on the remote controller 1 side is inputted to the comparator C1 on the device side 2 through the serial signal line 10a by the action of the transistor TR3, and the transistor TR2 is driven by the output of the comparator IC1 and input to the microcomputer 3. However, the remote control 1
As shown in FIG. 2, before the data signal transmitted from the
(L), 1 (H)o (L), 1 (H)
This interrupt signal is input to the interrupt signal input port NT of the microcomputer 3.

By the way, the time T from the rise A of the interrupt signal to the rise B of the next interrupt signal has a length equivalent to 2 bits of signal data, and the time t for the signal take 1 bit is T/
It becomes 2.

The microcomputer 3 determines the time t for one bit and stores it in the memory, and sets the timing of reception and transmission on the device side 2 in accordance with this time.

Therefore, the timing of transmission and reception between the remote controller 1 and the device side 2 can be matched.

Note that the interrupt signals shown in FIG. 2 are 0 (L), 1 (H), and O.
(L), 1 (H), but the reverse order is 1 (H), 0 (L), 1 (H),
The order may be 0(L).

〔Effect of the invention〕

If it is a wired remote control device as explained above, the reception and transmission timing on the device side is determined based on the interrupt signal added before the data signal sent from the remote control to the device side. This allows the timing of transmission and reception between the remote control and the device to be synchronized, allowing accurate remote control communication.

[Brief explanation of the drawing]

FIG. 1 is a remote control communication circuit diagram showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram of interrupt signals of the same embodiment. In the figure, 1 - remote control, 2 - device side, 3 - microcomputer, 4 - transmitting circuit, 5 - receiving circuit, 6 - microcomputer, 7 -
・Remote control transmitting circuit, 8-・Remote control receiving circuit, 9 constant voltage circuit section, 10 a- (line 8, 10b-power line, 1
0cm-ground wire, R1~R14-resistance, TRI~T
R4 transistor, ICI, IC2-.-Comparator. Patent applicant: Fujitsu General Ltd. Figure 2

Claims (1)

[Claims] In a remote control communication circuit that transmits and receives data as a serial signal between a remote control and a device controlled by the remote control via a signal line, etc., two consecutive interrupts are performed before the data signal transmitted from the remote control. add a signal including
The device that receives this interrupt signal calculates the 1-bit time from the 2-bit time from the first interrupt signal to the second interrupt signal, and then calculates the 1-bit time from the 2-bit time from the first interrupt signal to the second interrupt signal. A remote control communication circuit characterized in that the timing of receiving and transmitting is determined.