JPH0322740B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention connects a main operating section and a plurality of terminal devices via a transmission line, and the main operating section transmits a transmission signal to each terminal via time division multiplex transmission. However, the present invention relates to a time division multiplex transmission system in which each terminal device receives a transmission signal and then controls an external load through a load control unit such as a relay connected to each terminal device.

[Background technology]

FIG. 1 shows a schematic configuration example of this type of time division multiplex transmission system, in which a plurality of terminal devices 2 are connected to one circuit of transmission line 3 led out from the main operation section 1. sends power and data signals such as address signals and control data signals to each terminal device 2,
The terminal device 2 outputs a load control output such as a relay contact output for controlling the dependent load, and the monitoring input inputted to the terminal device 2 is sent as a return signal to the main operation unit 1 to output the current mode. It is sent back as a signal. FIG. 2 is an explanatory diagram of the operation of the system shown in FIG. a start signal indicating each channel, an address signal for selectively calling a terminal device 2 belonging to that channel by specifying that channel, and a control data signal specifying the control content of the selectively called terminal device 2. and a reply band signal indicating the sending time period of the reply signal from the terminal device 2 to the main operation unit 1 are sent in the above order, so that one channel's worth, that is, a transmission signal per one terminal is configured, The start signal also serves as a signal specifying the timing of load control. Figure c shows a waveform diagram of the reply signal in current mode, and shows the terminal device 2 of the channel specified by the address signal.
After receiving and decoding the control data signal, the transmission line 3 is intermittently short-circuited directly or through a small resistance during the receiving time period of the reply band signal based on the reply data from the monitoring input and other sources, and the reply as shown in the figure is generated. A signal is sent to the main operation section 1. d is a load control signal, and as described above, according to the content of the received control data signal, the load control signal as shown in the figure is output during the time period of the start signal. relays, etc. are driven. Figure e shows the state of waveform distortion appearing in the signal on the transmission line 3. As mentioned above, the current mode on the transmission line 3 is changed significantly, which caused waveform distortion as shown in the figure.

In order to solve this problem, in the conventional configuration, in the terminal device 2 selected by the address signal included in the transmission signal from the main operation section 1,
As shown in FIG. 2, an address matching signal is output in accordance with the sending time period of the reply signal, and the receiving operation of the terminal device 2 is disabled during the output period of this address matching signal. By this operation, the distorted waveform due to the reply signal from the terminal device 2 is no longer input to the terminal device 2 that outputs the address matching signal, and malfunctions can be prevented. However, in such a conventional example, the waveform distortion caused by another terminal device 2 sending a reply signal is received as is, and there is no way to remove the waveform distortion at the load control timing. There was a problem that malfunction could occur due to waveform distortion, and normal signal transmission could not be ensured.

[Purpose of the invention]

The present invention prevents malfunctions caused by waveform distortion of signals on the transmission line by disabling the receiving operation of the terminal except during the period when the terminal needs to receive the transmitted signal from the main operation unit. It is an object of the present invention to provide a time division multiplex transmission system that enables the transmission of multiple data.

[Disclosure of the invention]

(Configuration) In the present invention, as shown in FIG.
, a data format determination unit 4 that receives transmission signals sent from the main operation unit 1 to all terminal devices 2 and determines whether the format of the transmission signals matches a prescribed format; including the period during which the reply band signal is being sent when it is determined that the format of the transmitted signal matches the specified format, and the time when the load control unit 17 is activated, before the transmission of the next transmitted signal is started. A gate signal generating section 18 that outputs a gate signal corresponding to a set predetermined period and a gate circuit 5 that interrupts the reception operation of the transmission signal during the output period of the gate signal are provided.
In addition, a relay function circuit section 19 having a function of relaying the transmission signal is provided so that the transmission signal transmitted from the main operation section 1 through the transmission line 3 can be sent to another transmission line connected to the terminal device 2. It is added. The relay function circuit section 19 regenerates the transmission signal from the output of the gate circuit 5 and sends the regenerated transmission signal to another transmission line. Thereby, the signal from which the waveform distortion of the transmission signal has been removed can be transmitted to the other terminal device 2.

By the way, the gate signal operates the format signal outputted corresponding to the reply band signal which is the sending period of the reply signal as shown in FIG. 3a, and the load control section 17 as shown in FIG. 3b. and a start gate signal set to include the point in time, and by inputting both signals together to the NOR gate 6 and the AND gate 7, both gates 6, 7
The gate circuit 5 configured as shown in FIG. Furthermore, in the embodiment shown in FIG. 4, reference numeral 8 denotes a transmission signal input section which inputs the signal on the transmission line 3 and outputs a change point detection signal obtained by detecting a change point of the signal. The output of section 8 is inputted to terminal circuit section 16, which will be described later, via AND gate 7 of gate circuit 5. The data format determination section 4 determines whether the format of the transmitted data matches the predetermined format shown in FIG. 2b as described above, and also performs a checksum, parity check, etc. . Gate signal creation section 18
is three RS flip-flops 9, 10, 11
, a counter 12 , and an AND gate 13 , and the format signal and start gate signal output from this gate signal generator 18 are input to the NOR gate 6 of the gate circuit 5 . 14 is a T flip-flop for relay function, and its Q output is output to the transmission line 3 via a driver 15 for relay. Reference numeral 16 denotes a terminal circuit section, which is the main circuit section of the terminal device 2, which detects its own call by detecting address matching, recognizes control data, drives the load control section based on the recognized contents, and also provides monitoring input. etc. to create and send reply data.

(Operation) Fig. 5 shows the time chart of the circuit shown in Fig. 4. When a transmission signal on the transmission line 3 as shown in Fig. 5a, which has waveform distortion, is input to the transmission signal input section 8, a change as shown in Fig. 5b occurs. Since the point detection signal is output and the AND gate 7 of the gate circuit 5 is initially open,
The change point detection signal is input to the data format determination section 4 and the reset terminal of the counter 12.
The data format determining section 4 outputs a format match signal as shown in FIG.
The Q output of the RS flip-flop 9 as shown in FIG. 4D is input as a format signal to one input terminal of the NOR gate 6 of the gate circuit 5, and the AND gate 7 is closed. The counter 12 that counts the basic clock as shown in FIG.
Since no change point detection signal is output from , and therefore no input is generated at the reset end, the counting operation continues.
The output terminals Q _A , Q _B , and Q _C generate outputs as shown in f, g, and h in the figure, and when the signal shown in h in the figure appears at the output terminal Q _C , the RS flip-flop A reset signal is input to 9, the format signal falls as shown in d of the same figure, and the AND gate 7 is once opened. In addition, when an output is generated at the output terminal _QC of the counter 12, this occurs as shown in the figure i.
The second RS flip-flop 10 is set by the _QC output. Next, after the AND gate 7 is once opened as described above, a change point detection signal corresponding to the fall of the response band signal is outputted to the output terminal of the AND gate 7, and the counter 12 is thereby reset once. After that, the counting operation starts again.
After the second RS flip-flop 10 is thus set, when the Q _A output of the counter 12 is generated as shown in FIG. , the start gate signal shown in j of the same figure rises, and the AND gate 7 is closed again.
When the Q _B output is generated, the second and third RS flip-flops 10 and 11 are reset by the Q _B output, and the start gate signal falls as shown in j of the figure. In this way, the output terminal of the NOR gate 6 to which the format signal d in the same figure and the start gate signal shown in the figure j are input produces an output as shown in the figure k, and the output terminal of the AND gate 7 produces an output as shown in the figure l. A signal output is obtained from which a change point detection signal due to waveform distortion is removed. In addition, in the relay function circuit section 19, by inputting a change point detection signal from which components due to waveform distortion have been removed as shown in FIG. The transmission signal from which the distorted waveform has been removed is regenerated, and the regenerated transmission signal is input to the driver 15, and the regenerated transmission signal is transmitted to the transmission line which is provided separately from the original transmission line 3 and to which the terminal device 2 is connected. 3 will be sent on top.

〔Effect of the invention〕

As described above, in the first invention, the data for receiving the transmission signals sent from the main operation unit to all the terminals and determining whether the format of the transmission signals matches a prescribed format or not. When the format determination section determines that the format of the transmission signal matches the specified format, the transmission of the next transmission signal starts, including the period during which the reply band signal is being sent and the time when the load control section is activated. a gate signal generation unit that outputs a gate signal corresponding to a predetermined period set before the gate signal is output, and a gate circuit that blocks the reception operation of the transmission signal during the output period of the gate signal.
Since it is provided in the terminal device, regardless of which terminal device the transmission signal specifies, all terminal devices can transmit the response signal during the period during which the reply band signal is being sent, which is the sending time period of the reply signal, and The reception operation is disabled during a predetermined period including the time when the load control unit is activated, which prevents waveform distortion on the transmission line from being received and reduces the incidence of malfunctions and non-operations. This has the effect of significantly reducing the Moreover, such an operation can be realized with a relatively simple configuration.

Further, in the second invention, in addition to the configuration of the first invention, the transmission signal is regenerated from the output of the gate circuit and connected to a transmission line provided separately from the above transmission line and connected to another terminal. Since it is equipped with a relay function circuit that sends out a regenerated transmission signal, it is possible to send out a regenerated transmission signal that completely eliminates waveform distortion when sending a reply signal in any terminal device or when driving a load controller. , it has the effect that the reproduction of the transmitted signal can be realized with an extremely simple circuit, and in particular, when combined with the effect of the first invention, it is extremely easy to provide the terminal with the function of transmitting signal relay. This has the effect of simplifying the system and reducing costs.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the schematic configuration of a general time division multiplex transmission system, Fig. 2 is an explanatory diagram of the same operation as above, Fig. 3 is a waveform diagram of a gate signal in one embodiment of the present invention, and Fig. 4 is FIG. 5 is a block diagram of the main part of the same embodiment circuit as above, and FIG. 5 is an explanatory diagram of the operation of the circuit shown in FIG.
1 is a main operation section, 2 is a terminal device, 3 is a transmission line, 4 is a data format determination section, 5 is a gate circuit, 14 is a T flip-flop, 15 is a driver, 16 is a terminal circuit section, 17 is a load control section, 18 1 is a gate signal generation section, and 19 is a relay function circuit section.

Claims (1)

[Claims] 1. A main operation section and a plurality of terminal devices are connected via a transmission line, and the main operation section transmits a transmission signal to each terminal device in a time division multiplex manner, and each terminal device receives a transmission signal. This is a system that controls an external load through a load control unit such as a relay connected to each terminal after receiving the signal, and the transmission signal specifies each terminal individually and also controls the load control unit. In a time-division multiplex transmission system in which a voltage pulse signal is used as a voltage pulse signal including a data signal that specifies the content and a reply band signal that is the transmission time period of the reply signal from the terminal device to the main operation section, each terminal device is connected to the main operation section. a data format determination unit that receives transmission signals sent back from the terminal unit to all terminal devices and determines whether the format of the transmission signals matches a specified format; corresponds to the period during which the reply band signal is being sent when it is determined that they match, and the predetermined period that is set before the start of sending the next transmission signal, including the time when the load control unit is activated. A time division multiplex transmission system comprising: a gate signal generation unit that outputs a gate signal; and a gate circuit that blocks reception of a transmission signal during the output period of the gate signal. 2 Connect the main operation unit and multiple terminals via transmission lines, the main operation unit time-division multiplex transmits the transmission signal to each terminal, and each terminal transmits the transmission signal to each terminal after receiving the transmission signal. This is a system that controls an external load through a load control unit such as a relay connected to a terminal device, and the transmission signal is a data signal that individually specifies each terminal device and specifies the control content for the load control unit. In a time-division multiplex transmission system, each terminal transmits all signals sent from the main operation unit in a time-division multiplex transmission system in which the voltage pulse signal includes a data format determination unit that receives a transmission signal to a terminal device and determines whether the format of the transmission signal matches a specified format; A gate that outputs a gate signal corresponding to a period during which a reply band signal is being transmitted and a predetermined period that is set before the transmission of the next transmission signal starts, including the time when the load control unit is activated. A signal generating section, a gate circuit that interrupts the reception operation of the transmitted signal during the output period of the gate signal, and a gate circuit that regenerates the transmitted signal from the output of the gate circuit and is provided separately from the transmission line and connected to another terminal device. A time division multiplex transmission system comprising a relay function circuit unit that sends a regenerated transmission signal to a transmission line.