JPH01251995A - Data transmission system - Google Patents

Abstract

PURPOSE:To surely discriminate a signal and to prevent non-action and erroneous action by making the mode of the signal into the same mode as that of an operation signal, which indicates that an operation device is operated, when the operation signal and a non-operation signal, which indicates that the operation device is not operated, are overlapped. CONSTITUTION:When the address of wall switches 5 and 6 is made into #10, and only the wall switch 5 is pressed, a main console panel 1 designates the address #10 as usual and inquires of the respective wall switches 5 and 6 whether a signal to be sent exists or not. In response to the inquiry, the wall switch 5 of the address #10 sends an operation signal (a), the wall switch 6 of the same address #10 sends a non-operation signal (b) since no operation is executed, the signal are overlapped on a transmission line 2, the overlapped signal becomes the one shown in a figure (c), and the signal has same mode as that of the operation signal (a). Thus, since the mode of the overlapped signal becomes the same as that of the operation signal when the operation signal and the non-operation signal are overlapped, the signal can be discriminated surely, and the risk of the non-action and the erroneous action can be eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a data transmission system, and particularly relates to a main operation panel, a terminal device connected to the main operation panel via a transmission line, and a data transmission system connected to the terminal device. The present invention relates to a data transmission method that is suitable for application to lighting control systems and the like that include lighting equipment that can be controlled by control signals from terminals.

[Prior Art] Conventionally, in this type of lighting control system, a plurality of operating devices such as switches are sometimes connected to the same address on a transmission line.

FIG. 1 shows a schematic configuration diagram of a lighting control system which is a conventional example and is also an example to which the present invention is applied. The system shown in the figure includes a main operation panel 1, a terminal device 3 connected to the main operation panel 1 via a transmission line 2, and a lighting load 4 that is turned on at a predetermined illuminance in response to control data from the terminal device 3. , wall switch 5
, 6. The wall switches 5 and 6 are so-called multi-operation switches, and the same lighting load 4 can be operated from either switch. Both switches 5 and 6 are such that when pressed once, the illumination is turned on, and when pressed again, the light is turned off.

When the wall switch 5 or 6 is operated in such a system, the main operation panel 1 controls the lighting load 4 as follows.

For example, if a random transmission method is used, a signal is sent from the wall switch 5 or 6, which is the operation device, and
In response to this, the main operation panel 1 then switches the wall switch 5 or 6.
prompts you to specify the address and send data. In response to this, the wall switch 5 or 6 having the address specified by the main operation panel 1 sends a signal in the format shown in FIG. 2 to the main operation panel 1, indicating what kind of operation has been performed. do. In response to this, the main operation panel 1 sends a signal to the terminal device 3 to perform a predetermined operation, such as turning on or off the lighting load 4.

Further, when a cyclic transmission method is adopted, the main operation panel 1 periodically specifies an address to check whether there is any data to be sent to the wall switch 5 or 6. The wall switch 5 or 6 having the address designated from the main operation panel 1 receives this and processes it in the same manner as described above.

[Problems to be Solved by the Invention] Incidentally, since the multi-position switches 5 and 6 as described above are operating devices that operate the same lighting load, the same address may be given to them. In such a case, the wall switches 5 and 6 having the same address will receive a signal sent from the main operation panel 1 to specify an address and prompt the signal to be sent. In response to this, the wall switch 5 and the switch 6 determine that the specified address matches their own address, so both wall switches send out an operation signal or a non-operation signal. Therefore, these signals sometimes collide on the transmission line 2.

FIG. 5 shows the signal forms of the operation signal i and the no-operation signal j used in the conventional full two-wire transmission system. The operation signal has four channels, and the signal is formed of long and short pulses. The address of wall switch 5 is #10 and lch, and the address of wall switch 6 is also the same #10.
In the case of 2ch, if either wall switch or both wall switches are operated at the same time, the lch and 2ch signals sent from these wall switches will overlap and become a signal like this. Therefore, main operation panel 1
On the other hand, it became impossible to distinguish the signals sent from the wall switch, resulting in malfunction or non-operation.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional method, it is an object of the present invention to provide a data transmission system that can reliably identify a sent signal even when operated by multiple controllers such as wall switches having the same address. It is in.

[Means and effects for solving the problem] In order to achieve the above object, the present invention transmits a transmission signal including an address signal and a control signal from a main operation panel, and distinguishes the transmission signal by a terminal device. A data transmission method used in a system that controls a load, sends an operating signal from an operating device to the main operating panel, and controls the load based on the operating signal, wherein the operating device is operated. The feature is that when an operation signal indicating that the operation signal is not operated and a no-operation signal indicating that the operation is not performed are sent on the transmission line at the same timing, the signal form is the same as that of the operation signal.

According to the above configuration, when the operation signal and the no-operation signal overlap, the signal form is the same as that of the operation signal, so the signal can be reliably discriminated and there is no risk of non-operation or malfunction.

[Example] Hereinafter, the present invention will be explained in detail using the drawings.

In this embodiment, the present invention is applied to the lighting control system shown in FIG. 1 described above. Its operation is similar to that described in the explanation of the prior art, but in this embodiment, the third
An operation signal a and a no-operation signal S as shown in the figure are used.

Assume that the addresses of wall switches 5 and 6 are #1o, and that only wall switch 5 is pressed. At this time, main operation panel 1
As in the conventional example, the address #1o is specified and a message is sent to the wall switch asking whether there is a signal to be sent. In response to this, the wall switch 5 at address #10 sends out an operation signal a7, and since no operation has been performed from the wall switch 6 at the same address #10, it sends out a no-operation signal.

This overlaps on transmission line 2, but the overlapped signal is transmitted to the third transmission line.
It is as shown in Figure C, which has the same form as the operation signal a. Therefore, the main operation panel 1 detects that an operation signal is sent from the wall switch at address #10, and performs a predetermined control process.

The wall switch may be of the type that turns the light on or off each time it is pressed, or may be an on/off switch. In this case, there are two types of operation signals, an on signal and an off signal, but if you set the on signal d1 off signal e and no operation signal f as shown in Figure 4, the on signal d and the no operation signal When the signals g overlap, the signal g has the same form as the on signal d, and when the off signal e and the no-operation signal f overlap, the signal g has the same form as the off signal e, like the signal g. Therefore, the signals can be reliably discriminated.

[Effects of the Invention] As explained above, according to the present invention, when an operation signal indicating that an operating device such as a wall switch has been operated and a no-operation signal indicating that it has not been operated overlap, , the same form as the operation signal, the signal can be reliably identified and there is no risk of malfunction or malfunction.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an illuminance control system which is a conventional example and an example to which the present invention is applied; FIG. 2 is a diagram showing the format of an operation signal sent onto a transmission line; FIG. FIG. 4 is a waveform diagram of the transmission signal used in the data transmission system according to the embodiment of the present invention, and FIG. 5 is a waveform diagram of the transmission signal used in the conventional data transmission system. 1... Main operation panel, 2... Transmission line,
3...Terminal device, 4...Lighting load,
5.6...Wall switch.

Claims (1)

[Claims] 1. A transmission signal including an address signal and a control signal is sent from the main operation panel, the terminal device discriminates the transmission signal to control the load, and the operation signal is transmitted from the operation device to the main operation. A data transmission method used in a system that sends out toward a panel and controls the load based on the operation signal, and includes an operation signal indicating that the operation device has been operated and a no-operation signal indicating that the operation device is not operated. A data transmission method characterized in that the signal form is the same as that of an operation signal when the signals are sent on a transmission line at the same timing.