JP3546405B2 - Sensor contact switching power supply signal transmission / reception circuit system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sensor contact switching power supply signal transmission / reception circuit system for identifying which one of a plurality of security sensors provided on a building window or the like is activated, for example.
[0002]
[Prior art]
Conventionally, in this type of sensor identification method, a predetermined specific code is assigned to each terminal device, and a specific code is transmitted in advance from a central device to identify the terminal device, or a central There is a method of transmitting a specific code signal to a device in advance and performing identification in a central device.
[0003]
[Problems to be solved by the invention]
However, in each case, the terminal devices connected in series have complicated control circuits. In this case, power consumption must be supplied in proportion to the number of terminal devices to be connected, and the power supplied from the master unit becomes excessive.
When a sensor (make contact and break contact were mixed) connected in series with the master unit was activated, it was not known which sensor was activated.
There is also a problem of voltage drop due to line resistance, and there are drawbacks such as a limited number of terminal devices to be connected.
[0004]
[Means for Solving the Problems]
According to the present invention, in order to achieve this drawback, in a normal state, two wires from the master unit are connected in series only to the make contact of the transfer relay of each terminal device, and these wires are connected to each terminal device. It is open. When the sensor is activated, power is supplied only to the terminal that is closest to the parent device connected to the sensor, and the terminal after the activated sensor is disconnected by the transfer relay.
Next, the terminal starts operating, sends a code number of the terminal corresponding to the sensor to the master, and receives a confirmation signal from the master.
When transmission / reception of signals with the master unit is completed normally, the make contact of the transfer relay connected in series is restored, and power is supplied from the master unit to the terminal of the subsequent activation sensor, and the terminal corresponding to the sensor is restored. Send and receive code numbers. Hereinafter, this operation is sequentially performed in the terminal order of the sensor closest to the parent device. Power is supplied to only one terminal. Therefore, only one terminal is required, power is cheap, the construction cost is low, the number of terminals that can be connected can be increased, and the distance of the track can be increased.
A terminal circuit is connected to the last stage to enable disconnection detection.
As described above, an object of the present invention is to provide a sensor contact switching power supply signal transmission / reception circuit system.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
When the sensor is activated, its contact switches to the corresponding terminal to supply power and activate the terminal.
[0006]
At this point, the sensors connected subsequently and
The terminal is disconnected. Thereafter, signals are transmitted and received only between the activated terminal and the master unit.
[0007]
Even if the sensor recovers, power is supplied until the signal is reliably transmitted and received, the subsequent sensors are disconnected, and then the original state is restored.
[0008]
【Example】
The embodiment will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of the embodiment, in which 1 is a master unit, 2 (break contact 2A), 3 (make contact 3A). , 4 (break contact 4A), 5 (make contact 5A) are sensor contact switching terminals connected in series to two lines 7 (L1) and 8 (L2), 6 is a termination circuit connected to the last stage (Terminator). 1 is a master unit, 1A is a control circuit that controls the circuit, and 1B is a circuit that sends and receives signals from terminals and also supplies power. Reference numeral 2B denotes a detection circuit for the break contact 2A connected to 2 terminals, and 2C denotes a circuit for supplying power of 2 lines to 2E.
Reference numeral 2E denotes a control circuit in the terminal, which receives a power supply from the line 7 through the circuit 2C at the same time as the activation of the terminal 2B, and switches a 2D transfer relay circuit (although not specified, a semiconductor switch may be used). It is a circuit that makes a line and a path. It is a circuit for transmitting and receiving signals to and from the master unit.
When the make contact 3A is started, the circuit of 3C conducts at the same time as the start, and the power is supplied to the control circuit of 3E via the line 7. 3E switches the 3D transfer relay circuit upon start-up, making the 7 line and path.
It is a circuit for transmitting and receiving signals to and from the master unit.
4B is a detection circuit of the break contact 4A connected to 4 terminals, and 4C is a circuit for supplying power of 4 lines to 4E.
Reference numeral 4E denotes a control circuit in the terminal, which receives power from the line 7 via the circuit 4C at the same time as the activation of the terminal 4B, and switches the transfer relay circuit of the 4D (although not specified, a semiconductor switch may be used). It is a circuit that makes a line and a path. It is a circuit for transmitting and receiving signals to and from the master unit.
When the make contact 5A is activated, the circuit 5C conducts at the same time as the start, and supplies power to the control circuit 5E via the line 7. 5E switches the transfer relay circuit of 5D at the time of start-up, and makes a line and a path of 7.
It is a circuit for transmitting and receiving signals to and from the master unit.
Reference numeral 6 denotes a terminal circuit at the last stage of the terminal devices connected in series, and 6A denotes a terminal resistor.
[0009]
FIG. 2 shows a specific circuit configuration of the terminal 20 connected to the break contact (B) at the sensor contact connected to the terminal. When the sensor contact 20A operates from make to break, the sensor contact detection circuit 20B conducts, then the pass circuit 20C (diode left) conducts, power is supplied to the control circuit 20F, the circuit operates, and the relay RL ( 20E) to switch the contact of the transfer switch 20D from r2 to r1. Next, the right side of the diode of the pass circuit 20C conducts, is connected to the line 7, and is connected to the master unit 1. Signals are transmitted and received from the control circuit 20F of the terminal device 20.
Even if the sensor contact 20A is restored, the control circuit holds the contact of the relay r1 on the line 7 until the transmission and reception of the signal is completed, supplies power to the 20F via the pass circuit 20C (diode right), and simultaneously transmits and receives the signal. it can.
When the transmission / reception of the signal is completed, the relay RL (20E is opened and returns to the contact of r2. The operation of the break contact is thus performed.
[0010]
FIG. 3 shows a circuit configuration of the terminal 30 connected to the make contact (M). When the sensor contact 30A operates from break to make, the pass circuit 30C (diode left) conducts, power is supplied to the control circuit 30F, the circuit operates, the relay RL (30E) is driven, and the contact of the transfer switch 30D. Is switched from r2 to r1. Next, the right side of the diode of the pass circuit 30C conducts, is connected to the line 7, and is connected to the parent device 1. Signals are transmitted and received from the control circuit 30F of the terminal device 30. Even if the sensor contact 30A is restored, the control circuit holds the contact of the relay r1 on the line 7 until the transmission and reception of the signal is completed, supplies power to the 30F via the pass circuit 30C (diode right), and simultaneously transmits and receives the signal. it can. When the transmission / reception of the signal is completed, the relay RL (30E is opened and returns to the contact of r2. Thus, the operation of the make contact is performed.
[0011]
【The invention's effect】
As described above, according to the present invention, the identification of a large number of sensors is reliably performed by the two signal lines, and not only can information be transmitted, but also the effects of greatly reducing equipment costs can be obtained. It has the benefits to bring.
In addition, when the sensor of the terminal device whose power is disconnected is operated, the state can be maintained by adding a battery.
[Brief description of the drawings]
FIG. 1 is a circuit configuration diagram of an embodiment.
FIG. 2 is a block diagram of a break (B) contact of the sensor.
FIG. 3 is a block diagram of a make (M) contact of the sensor.
[Explanation of symbols]
1 is a base unit 2, 3, 4, 5;
1A is a control circuit 1B is a signal transmission / reception and power supply circuit.
2A, 3A, 4A and 5A are sensor contacts.
2B and 4B are additional circuits in the case of a break contact.
2E, 3E, 4E and 5E are control circuits of the terminal.
2C, 3C, 4C and 5C are switch circuits.
2D, 3D, 4D, 5D are separation circuits.
6A is a terminating resistor.
20 is a terminal of the break contact (B).
20A is a sensor contact (break).
20B is a switching circuit for detecting the operation of 20A.
20C is a pass circuit.
20D is a transfer switch.
20E is a circuit for driving the contact of 20D.
20F is a control circuit of the terminal.
21 is a termination circuit.
30 is a terminal for make contact (M).
30A is a sensor contact (make).
30C is a pass circuit.
30D is a transfer switch.
30E is a circuit for driving a 30D contact.
30F is a terminal control circuit.
31 is a termination circuit.

Claims (1)

Master unit, two wires for power and signal connected to the master unit, and no-voltage break contacts (normally on) or make contacts (normally off) as sensors connected to the two wires. , A control circuit provided in each terminal, a transfer relay, and a termination circuit connected to the last stage in which the terminals are connected in series. In the contact switching power supply signal transmission / reception circuit system, when one of the sensors in the plurality of terminals connected to the two lines is activated, the activated terminal closest to the master first operates. Then, a sensor in the terminal and a detection circuit in the terminal connected to one of the two wires connected to the master unit operate, and the control circuit is connected to the detection circuit and the series. And the diode connected to the Supply a source, the control circuit is driven at this time, driving a transfer relay connected to the control circuit, the transfer relay being connected to one of the two wires The switch on the common side of the transfer relay in the terminal is switched from the break contact side (normally on) to the make contact (normally off) side, and the control circuit is connected via a diode connected to the make contact side. Connected, connected to one line of the master unit, supplying power, and at the same time disconnecting the subsequent terminal unit, in this state, even if the sensor is restored, the control circuit of the terminal unit and the master unit are surely When the power is supplied and the signal is transmitted and received, and the transmission and reception of the signal is completed, the control circuit switches the switch on the common side of the transfer relay to the break contact side and restores it. By being released from the connection with the terminal, the installation location of each terminal device can be reliably notified to the master device, and the master device only needs to supply power for one terminal device. Sensor contact switching power supply signal transmission / reception circuit system.

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