JPH043719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a time division multiplex remote control system.

[Background technology]

Conventionally, this type of time-division multiplexing remote control system connects a central control device 1 and a plurality of terminal devices 2 via signal lines 3, as shown in FIG. Call control data of load 4
At the same time as transmitting D _C , monitoring data D _B of the load 4 was sent back from the called terminal 2 to the central control device 1. Figure 2 shows a transmission signal V _S that is cyclically transmitted from the central control unit 1 to each terminal 2 in sequence, and the transmission signal V _S includes a start pulse signal SP indicating the start of transmission and an address for calling the terminal 2. Address signal V _A that transmits data D _A
, a control signal V _C that transmits the control data D _C , and a return standby interval signal V _W that sets the return timing of the monitoring data D _B from the terminal device 2. The return signal _VB for returning _B is sent back in synchronization with the return waiting period signal _VW . By the way, when controlling a load 4 such as a damper of an air conditioner in an analog manner using such a remote control system, a stepping motor is driven by the control output (contact output) of the terminal 2 to control the damper. The angle of the damper was adjusted by controlling the rotation of the control potentiometer. However, since such a conventional example uses a stepping motor, there are problems in that the size is large, making it difficult to store in a distribution board, etc., and increasing costs.Furthermore, the central control unit 1 The monitoring data D _B sent back to the motor was generated using an up-down counter that counted the control pulses of the stepping motor, but this had the problem of complicating the circuit configuration and requiring a backup power source in the event of a power outage. Ta.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a time-division multiplex remote control system that is small and inexpensive and does not require the use of stepping motors or backup power supplies. .

[Disclosure of the invention]

(Embodiment) Fig. 3 shows an embodiment of the present invention, in which 10 is a power supply circuit that rectifies a transmission signal V _S consisting of a bipolar signal to form a power supply V _CC for a terminal circuit, and 11 is an address match determination circuit. The terminal circuit 11 is a terminal circuit including a control data discriminating section, a control data discriminating section, and a return signal generating _{section .} It is determined whether the address data D _A matches the address data D A sent by the
Control data D _C sent in control signal V _C following V _A
and outputs each bit data to the relay drive terminals RD ₁ to RD ₄ , and also forms a return signal V _B based on the monitoring data D _B input to the monitoring input terminals IN ₁ to _{IN 5} and sends it back. Output to output terminal RET. However, Q _B is a switching transistor for sending out a return signal V _B in current mode by short-circuiting the signal lines 3 via a resistor R _B. Reference numeral 13 denotes latching relays Ry ₁ to _{Ry 4} controlled by output signals V _C1 to V _C4 corresponding to each bit data of control data D _C , and each latching relay.
The contacts _{ra 1 to ra 4 and} rb ₁ to rb 4 of Ry 1 to Ry ₄ are connected in parallel to control resistors R ₁ to R ₄ and R ₁ ′ to _{R 4} ′, respectively, and are an output section, and the control resistors ra ₁ ~ ra ₄ , rb ₁ ~ rb ₄
are connected in series with each other, and a load 4 such as a damper of an air conditioner is controlled by the resistance value between the output terminals O ₁ and O ₂ or between the output terminals O ₂ and O ₃ . Note that the output signal V _C5 is a signal for setting relay drive timing, and Q ₁ to _{Q 9} are drive transistors. 14 is a latching relay
This is a monitoring data creation unit that creates monitoring data D _B based on the contact states of contacts rC ₁ to rC ₄ of Ry ₁ to Ry ₄ .
In addition, a control resistor R ₁ with contacts ra ₁ to _{ra 4} connected in parallel
The load 4 may be controlled by a combined resistance formed by a parallel circuit of ~ _R4 . However, the overall configuration of the remote control system is the same as the conventional example shown in FIG.

The operation of the embodiment will be explained below. Now, the transmission signal V _S sent from the central control device 1 is received by each terminal device 2 via the signal line 3, and the transmission signal V _S is rectified and smoothed in the power supply circuit 10 to be used as the terminal circuit power supply V _{CC .} is formed, and predetermined signal processing is performed in the terminal circuit 11. That is, the terminal circuit 11 determines whether the address data D _A sent by the transmission signal V _S matches its own unique address, and when an address match is obtained, the control data sent by the transmission signal V _S is determined. It outputs output signals V _C1 to V _C4 corresponding to each bit of data D _C and an output signal V _C5 that sets relay drive timing. When this output signal V _C1 to V _C4 is “H”,
The latching relays Ry ₁ to _{Ry 4} are set and the contacts
ra ₁ ~ ra ₄ , rc ₁ ~ rc ₄ turn on, and contact rb ₁ ~
rb ₄ turns off. On the other hand, when the output signals Vc ₁ to Vc ₄ are "L", the latching relays Ry ₁ to Ry ₄ are reset, the contacts ra ₁ to ra ₄ and rc ₁ to rc ₄ are turned off, and the contacts rb ₁ to rb ₄ are turned off. turns on. For example, when "0011" is sent from the central control device 1 as the control data D _C , the output signals Vc ₁ and Vc ₂ become "H" level, the output signals Vc ₃ and Vc ₄ become "L" level, and the output signal Vc ₅ becomes "H" level. When becomes “H” level, latching relays Ry ₁ and Ry ₂ are set, and the latching relays
Ry ₃ and Ry ₄ are reset. Therefore, the contact
ra ₁ , ra ₂ , rb ₃ , rb ₄ are turned on and control resistors R ₁ , R ₂ ,
R ₃ ′ and R ₄ ′ are short-circuited, and the resistance value between the output terminals O ₁ and _{O 2} becomes R ₁ +R ₂ , and the resistance value between the output terminals O ₂ and O ₃ becomes R ₃ ′+R ₄ ′. Similarly, the resistance value between the output terminals O ₁ - O ₂ and O ₂ - O ₃ is changed according to the control data _DC , and the resistance value between the output terminals O 1 - O 2 and O 2 - O 3 is changed depending on this resistance value.
(for example, a damper in an air conditioner) is controlled. On the other hand, since the monitoring data D _B sent back from the terminal device 2 to the central control device 1 is created in the monitoring data creation section 14 based on the contacts rc ₁ to rc ₄ of the latching relays Ry ₁ to Ry ₄ , In the central control device 1, the status of the other contacts ra ₁ to ra 4 and rb ₁ to rb ₄ of the latching relays Ry ₁ to _{Ry 4 can} be known from the monitoring data D _B , and the output terminals O ₁ to O ₂ , the resistance value between O ₂ and O ₃ , that is, the operating state of the load 4 can be accurately grasped. Here, since the output section 13 is formed using the latching relays Ry ₁ to _{Ry 4} , power is not supplied to the terminal device 2 due to a power outage or a disconnection or short circuit of the signal line 3. Even if there is a case,
When the power outage or failure is restored, the previous operating status is immediately sent to the central controller 1 as monitoring data D _B.
It will be possible to send it back to . in this case,
Unlike the conventional example, there is no need for a backup power source using a battery, and miniaturization and cost reduction can be achieved.

[Effects of the Invention] As described above, the present invention connects a central control device and a plurality of terminal devices via signal lines, calls the terminal devices from the central control device, transmits load control data, and In a time-division multiplex remote control system in which load monitoring data is sent back from a terminal device to a central control device, the latching relays controlled by each bit of control data and the contacts of each latching relay are connected in parallel. The terminal is equipped with an output section consisting of a plurality of connected control resistors and a monitoring data creation section that creates monitoring data based on the contact status of each latching relay. The load control resistance value can be changed by controlling the latching relay using control data.
There is no need to use a stepping motor as in the conventional example, and since the output section and monitoring data creation section are created using the contacts of the latching relay, there is no need to provide a backup power supply for power outage protection. This has the advantage of providing a time-division multiplexing remote control system that is simple in configuration, compact, and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a conventional example, FIG. 2 is an explanatory diagram of the same operation as above, and FIG. 3 is a circuit diagram of an embodiment of the present invention. 1 is a central control unit, 2 is a terminal device, 3 is a signal line,
13 is an output section, and 14 is a monitoring data creation section.

Claims (1)

[Claims] 1 Connect the central control device and multiple terminal devices via signal lines, call the terminal devices from the central control device and transmit load control data, and send load monitoring data from the called terminals to the central control device. In a time-division multiplex remote control system configured to send back data, an output section includes a latching relay controlled by each bit of control data and a plurality of control resistors in which the contacts of each latching relay are connected in parallel. and a monitoring data creation unit that creates monitoring data based on the contact state of each latching relay, the terminal device is provided with a monitoring data creation section that creates monitoring data based on the contact state of each latching relay, and the load is controlled by a series or parallel circuit of control resistors. Division multiplex remote control system.