JPH0720284B2 - Time division multiplex signal transmission system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a time division multiplex signal transmission system in which control data for calling a terminal from a central control unit to control a load is time division multiplex transmitted.

BACKGROUND ART In general, a signal transmission system using a time division multiplex signal transmission system of this type in which control data for calling a terminal device to call a terminal and transmitting load is transmitted from a central control device is generally shown in FIG. As shown in (a), the central control unit 1 and a plurality of terminal units 2 having unique addresses are connected to the signal line 3 to form the mode data MD for setting the control mode from the central control unit 1. , A data signal DT for transmitting address data AD for calling each terminal device, control data CD for controlling a load (not shown) connected to each terminal device 2, and the like, are time-divisionally multiplexed through a signal line 3. It was like this.
FIG. 1 (b) shows a multi-polar transmission signal Vs transmitted from the central control unit 1, which is a data signal DT for transmitting data by a pulse width modulation signal following a start signal ST indicating the start of data transmission. And a return waiting period T in which a reception confirmation signal returned in a current mode signal from the terminal device 2 is returned.
And a return period setting signal WT for setting

FIG. 6 shows a format example of data transmitted by the conventional data signal DT. Mode data MD, address data AD, control data CD and checksum data SD.
Data such as is transmitted at a predetermined timing. FIG. 6 (a) shows a data signal in the individual calling mode.
This data signal DT indicates mode data MD that sets the control mode to the individual control mode, address data AD that accesses a specific terminal device 2, and control data that is transmitted to the called terminal device 2. It is formed of a CD and checksum data SD, and each terminal 2 is individually accessed to transmit the control data CD.
FIG. 6 (b) shows a data signal DT in the simultaneous control mode, which includes mode data MD for setting the control mode to the group control mode, group address data AD 'for simultaneously accessing a plurality of terminals 2, and a plurality of group address data AD'. The control data CD is transmitted to the called terminal 2 and the checksum data SD, and the control data CD is transmitted by simultaneously accessing the terminals 2 in the same group.

By the way, in the case of controlling a large number of loads such as a floor proof device in such a conventional example, when the terminal 2 corresponding to each load is accessed in the individual control mode to transmit the control data CD, Since the response speed greatly varies, for example, there is a problem in that a large number of certification devices are sequentially turned on or off, and unnatural blinking control is performed. Therefore, it suffices to collectively access the terminal devices 2 corresponding to each load by group control data and transmit the control data CD.
In this case, although the response speed becomes faster, the return waiting period T
Since a plurality of reception confirmation signals returned from each terminal 2 are superimposed on each other to cause an interference state, the reception status of the transmission signal in the group control mode at each terminal 2 cannot be confirmed, and the transmission reliability is significantly reduced. There was a problem of doing.

[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a fast response speed when controlling a plurality of loads and to ensure that the control data is normally transmitted to the terminal device. The central control unit can easily confirm whether or not it was transmitted,
An object of the present invention is to provide a time division multiplex signal transmission system that can realize a control system with high transmission reliability.

DISCLOSURE OF THE INVENTION (Embodiment) FIG. 1 to FIG. 3 show an embodiment of the present invention, in which a central control unit 1 and a plurality of terminals 2 each having a unique address are connected to a signal line 3. Transmission of transmission data such as mode data MD for connecting and setting the control mode from the central control unit 1, address data AD for calling each terminal 2, control data CD for controlling the load connected to each terminal 2, and the like by the signal line 3 In the time division multiplex signal transmission method similar to the conventional example in which the time division multiplex transmission is performed via the, the mode data MD for setting the control mode to the pattern control mode and the load to be collectively pattern controlled are connected. and start address data AD "of the terminal device group, the control de transmitted respectively and byte counter data BD indicating the number of the control data CD ₁ ~CD _n to be transmitted to the address order of the terminal unit groups to each terminal unit 2 Data CD
Then, the central control unit 1 transmits a transmission signal Vs for pattern control for transmitting the data signal DT and the return period setting signal WT as shown in FIG. On the other hand, the transmission signal for pattern control
Each terminal device 2 that has received Vs determines whether or not the rank of its own unique address as viewed from the start address is smaller than the byte counter data BD, and if it is smaller, it is determined that access has been made from the central control device 1. it is obtained from the control data CD ₁ in ～CD _n sequentially transmitted to control the load takes in control data CD ₁ ～CD _n corresponding to its rank Te. FIG. 3 is a diagram showing the correspondence between the transmitted control data CD _{1 to} CD _n and the unique address of the terminal device 2. In addition, the return waiting period T set by the return period setting signal WT
Divides the return waiting period T into n and sets the divided return waiting period T _{1 to} T _n corresponding to each terminal 2, and synchronizes with each divided return waiting period T _{1 to} T _n. acknowledgment signal Vb ₁ through Vb _n from the terminal device 2 is adapted to be time division multiplexed back by the current mode signal (current signal obtained by connecting an appropriate resistance between the signal line 3). In addition, each division return waiting period T ₁
Through T _n is each control data CD ₁ ~CD _n has a return period corresponding to the terminal device 2 to be captured.

The operation of the embodiment will be specifically described below. Now
As shown in FIG. 4, operation switches S _{1 to} S _{16 for} controlling on / off of 16 loads (certifying equipment of a certain floor) are installed in parallel on the operation part, and each load is connected to a unique terminal unit 2. address is set to the 00 _H ~0F _H, on illustrating the respective load in FIG. 4, in the case of controlling the oFF state, the pattern control mode transmission signal transmitted from the central controller 1
The format of the data signal DT transmitted by Vs is as shown in FIG. That is, the mode data MD is set to the pattern control mode, and the start address data AD ″ is 00.
_H and byte counter data BD are set to 16 respectively,
Control data CD _{1 to} CD for controlling each load on and off thereafter
₁₆ are sequentially transmitted, and finally the checksum data SD is transmitted. The terminal device 2 that has received the transmission signal Vs in the pattern control mode determines whether or not it has been accessed based on the start address data AD ″ and the byte counter data BD. It is judged whether or not the order of the unique address is smaller than the byte counter data, and if it is smaller, it is judged that the access is made from the central control unit 1. In the called terminal 2, the control data CD _{1 to} CD sequentially transmitted. _The control data CD _{1 to} CD ₁₆ corresponding to the own rank is fetched from ₁₆ to control the load, for example, from the start address OO _H to 3
The terminal 2 having the second unique address 02 _H takes in the control data CD ₃ transmitted third and controls the load off.

Next, in each terminal device 2 which has received the control data CD _{1 to} CD ₁₆ , when it is confirmed that the data reception is normally performed based on the checksum data SD, the return period setting signal
In return waiting period during T set by the WT, sends back an acknowledgment signal Vb ₁ through Vb ₁₆ in synchronism with the return wait period T ₁ through T ₁₆ assigned thereto. The central control unit 1 checks whether or not the reception confirmation signals Vb _{1 to} Vb ₁₆ are returned in each of the divided return waiting periods T _{1 to} T ₁₆ , and all the divided return waiting periods.
When the reception confirmation signals Vb _{1 to} Vb _{16 are} returned to T _{1 to} T ₁₆ ,
Each terminal device 2 determines that the control data CD _{1 to} CD ₁₆ have been normally received and ends the control operation. On the other hand, when the reception confirmation signals Vb _{1 to} Vb ₁₆ are not returned in any of the divided return standby periods T _{1 to} T ₁₆ , the terminal device 2 is called in the individual control mode and the control data is transmitted again. .

In the embodiment, the signal reception state in each of the divided return waiting periods T _{1 to} T ₁₆ is checked, but the reception confirmation signal Vb including the pulse signal returned in the return waiting period T by the central controller 1 Count the number of _{1 to} Vb ₁₆ to 16
When 16 pulses are not returned, it is judged that the control data CD _{1 to} CD ₁₆ are normally received by all the terminals 2 when the 16 pulses are returned, and the 16 control pulses are not returned. May determine that the control data CD _{1 to} CD ₁₆ are not normally received by any of the terminals 2 and retransmit the transmission signal Vs in the pattern control mode. In addition, the transmission signal Vs in the group control mode for simultaneously turning on or off each load from the central controller 1 is sent to each terminal 2
It is needless to say that the reception confirmation signal returning method according to the present invention can be used even in the case of transmission to the.

As described above, in the embodiment, the control data CD ₁ is sent to all the terminals 2 in the terminal group by only accessing the head address of the terminal group consisting of 16 terminals 2 to which the load to be collectively controlled is connected. CD ₁₆ can be sequentially transmitted, and the response speed can be significantly increased as compared with the case where control data is transmitted to the 16 terminals 2 in the individual control mode. For example, when the required transmission time (1 packet) of each transmission signal Vs in the individual control mode is 15 ms,
The time required to transmit the control data CD _{1 to} CD ₁₆ to all the terminals 2 in the individual control mode is 240 ms, but in the pattern control mode according to the present embodiment, the control data CD is about 48 ms.
_{1 to} CD ₁₆ can be transmitted, and a speedup of about 5 times can be realized. In addition, since different control data CD _{1 to} CD ₁₆ can be transmitted to each terminal 2 of the terminal group, a plurality of loads can be collectively controlled in an arbitrary pattern, and the terminals can be controlled together. By appropriately setting the head address of the group and the byte counter data, it is possible to easily select the load that can be collectively controlled, so that a highly versatile control system can be easily realized. Furthermore, a divided return waiting period corresponding to each terminal 2 set by dividing the return waiting period T
Since T ₁ is the through T ₁₆ to return an acknowledgment signal Vb ₁ through Vb _16, it can be easily confirmed whether control data CD ₁ ~CD ₁₆ is reliably transmitted to the terminal device 2 at the central control unit 1 , Transmission reliability can be increased.

[Effect of the Invention] As described above, the present invention connects a central control device and a plurality of terminals to which a unique address is set to a signal line, and the central control device forms a terminal group including a plurality of terminals. Time-division multiplex transmission of pattern control mode transmission signals that collectively call and transmit control data sequentially via signal lines,
In the time-division multiplex signal transmission method in which each terminal device receiving the transmission signal in the pattern control mode fetches the control data corresponding to its own unique address to control the load, after the transmission signal in the pattern control mode A return period setting signal for setting a return waiting period of the load monitoring data sequentially returned from each terminal of the terminal group is provided at the end,
The return standby period set by the return period setting signal was divided to set the divided return period corresponding to each terminal unit, and the monitoring data was returned in time division multiplex from each terminal unit in synchronization with each divided return period. Since multiple terminals are collectively called and control data is transmitted, it is possible to speed up the response speed when controlling multiple loads, and to send to each terminal during the return waiting period. Since the reception confirmation signal is returned by setting the corresponding divided return standby period, the central control unit can easily confirm whether or not the control data was normally transmitted to the terminal device, and the control system has high transmission reliability. There is an effect that can be realized.

[Brief description of drawings]

FIG. 1 (a) is a schematic configuration diagram of a time division multiplex signal transmission system according to the present invention, FIG. 1 (b) is a diagram showing transmission signals of the same, and FIGS. 2 to 5 are embodiments of the present invention. Operation explanatory diagram of
FIG. 6 is a diagram for explaining the operation of the conventional example. Reference numeral 1 is a central controller, 2 is a terminal device, and 3 is a signal line.

Claims (1)

[Claims] 1. A central control unit and a plurality of terminal units each having a unique address are connected to a signal line, and the central control unit collectively calls a terminal unit group consisting of a plurality of terminal units to obtain control data. Time division multiplexing, in which transmission signals to be sequentially transmitted are time division multiplexed transmitted via a signal line, and each terminal device receiving the transmission signal fetches control data corresponding to its own unique address to control the load. In the signal transmission method, a return period setting signal is provided at the trailing end of the transmission signal to set the return standby period for the return confirmation signal that is sequentially returned from each terminal in the terminal group, and the return period is set by the return period setting signal. It is characterized in that the standby period is divided and a divided return standby period corresponding to each terminal is set, and the reception confirmation signal is returned from each terminal in time division multiplex in synchronization with each divided return standby period. Division multiplex signal transmission system when that.