A control linkage circuit for multiplexing communication and dry contact interface

Abstract

The utility model discloses a control linkage circuit for multiplexing communication and dry contact interfaces, comprising a multiplexing terminal capable of receiving communication signals and dry node signals, wherein the output end of the multiplexing terminal is connected with a dry node signal detection circuit for detecting whether the signal received by the multiplexing terminal is a dry node signal, a dry contact on-off driving circuit for controlling the on-off of the dry node, a communication circuit for communicating with the multiplexing terminal, and a communication on-off driving circuit for controlling the on-off of communication between the multiplexing terminal and the communication circuit, wherein the multiplexing circuit also comprises a main control circuit respectively connected with the dry node signal detection circuit, the dry contact on-off driving circuit, the communication circuit, and the communication on-off driving circuit, controlling the dry contact on-off driving circuit to connect the dry node when the dry node signal detection circuit detects the dry contact signal, and controlling the communication on-off driving circuit to drive the communication circuit to perform communication work when the dry node signal detection circuit does not detect the dry contact signal, realizing multiplexing through the switch control of a relay, realizing higher signal isolation and electrical isolation, and reducing the influence of interference and noise.

Description

[Technical field]

[0001] The utility model relates to a control linkage circuit for multiplexing communication and dry contact interfaces. [Background Technology]

[0002] At present, the linkage between devices such as salt machines and water pumps, electric heaters and water pumps mainly involves Modbus 485 communication protocol and dry contact control. Modbus 485 is a commonly used serial communication protocol used to achieve data exchange and control between different devices. Through Modbus 485, devices can communicate with each other and share data, such as sensor data, control commands, etc. On the other hand, dry contact control is a way to achieve linkage between devices through dry contacts such as switches. When the state of a device changes, the action of other devices can be triggered through dry contact control to achieve linkage operation.

[0003] When the device has both a 485 interface and a dry contact interface for control linkage, the hardware space is too large, making it difficult to design the device in a miniaturized form, which conflicts with the current design concept of small and beautiful equipment. [Contents of the utility model]

[0004] The utility model overcomes the shortcomings of the prior art, provides a control linkage circuit for multiplexing communication and dry contact interfaces, multiplexes the communication interface and the dry contact interface, reduces the hardware installation space, improves the space utilization rate of the equipment, and makes the equipment meet the design requirements of being small and beautiful.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A control linkage circuit for multiplexing communication and dry contact interfaces, characterized in that: it includes a multiplexing terminal that can receive communication signals and dry node signals, the output end of the multiplexing terminal is connected to a dry node signal detection circuit for detecting whether the signal received by the multiplexing terminal is a dry node signal, a dry contact on-off drive circuit for controlling the on-off of the dry node, a communication circuit for communicating with the multiplexing terminal, and a communication on-off drive circuit for controlling the on-off of communication between the multiplexing terminal and the communication circuit, the multiplexing circuit also includes a main control circuit that is respectively connected to the dry node signal detection circuit, the dry contact on-off drive circuit, the communication circuit, and the communication on-off drive circuit, controls the dry contact on-off drive circuit to connect the dry node when the dry node signal detection circuit detects the dry contact signal, and controls the communication on-off drive circuit to drive the communication circuit to communicate when the dry node signal detection circuit does not detect the dry contact signal.

[0007] The control linkage circuit for multiplexing communication and dry contact interface as described above is characterized in that the multiplexing terminal is a 2PIN connection terminal J1.

[0008] A control linkage circuit for multiplexing communication and dry contact interfaces as described above is characterized in that: the dry contact signal detection circuit includes a detection chip U1, pin 1 of the detection chip U1 is connected to pin 1 of the connection terminal J1, pin 2 of the detection chip U1 is connected to pin 2 of the connection terminal J1, pin U3 of the detection chip is grounded, pin 4 of the detection chip U1 is respectively connected to one end of a resistor R7 and a main control circuit through a resistor R4, and the other end of the resistor R7 is grounded.

[0009] A control linkage circuit for multiplexing communication and dry contact interfaces as described above is characterized in that: the dry contact on-off drive circuit includes a relay RY2, a pin 1 of the relay RY2 is connected to the collector of the transistor Q2, the base of the transistor Q2 is respectively connected to one end of the resistor R6 and one end of the resistor R5, the other end of the resistor R5 is connected to the main control circuit, the other end of the resistor R6 and the emitter of the transistor Q2 are respectively grounded, the pin 2 of the relay RY2 is connected to a 5V power supply, the pin 3 of the relay RY2 is connected to the pin 1 of the connection terminal J1, and the pin 4 of the relay RY2 is connected to the pin 2 of the connection terminal J1.

[0010] A control linkage circuit for multiplexing communication and dry contact interfaces as described above is characterized in that: the communication circuit includes a communication chip U2, communication chip U2 pins 1-4 are respectively connected to the main control circuit, communication chip U2 pin 5 is grounded, communication chip U2 pins 6-7 are connected to the communication on-off drive circuit, and communication chip U2 pin 8 is connected to a 5V power supply.

[0011] The control linkage circuit for multiplexing communication and dry contact interface as described above is characterized in that the communication chip U2 is an RS485 communication chip.

[0012] A control linkage circuit for multiplexing communication and dry contact interfaces as described above is characterized in that: the communication on-off drive circuit includes a relay RY1 and a relay RY3, the pin 1 of the relay RY1 is connected to the collector of the transistor Q1, the base of the transistor Q1 is respectively connected to one end of the resistor R2 and one end of the resistor R1, the other end of the resistor R1 is connected to the main control circuit, the other end of the resistor R2 and the emitter of the transistor Q1 are respectively grounded, the pin 2 of the relay RY1 is connected to the 5V power supply, the pin 3 of the relay RY1 is connected to the pin 1 of the connection terminal J1, and the pin 4 of the relay RY1 is connected to the communication circuit through the resistor R3; the pin 1 of the relay RY3 is connected to the 5V power supply, the pin 2 of the relay RY3 is connected to the collector of the transistor Q3, the base of the transistor Q3 is respectively connected to one end of the resistor R9 and one end of the resistor R10, the other end of the resistor R10 is connected to the main control circuit, the other end of the resistor R9 and the emitter of the transistor Q3 are respectively grounded, the pin 3 of the relay RY3 is connected to the communication circuit through the resistor R8, and the pin 4 of the relay RY3 is connected to the pin 2 of the connection terminal J1.

[0013] A control linkage circuit for multiplexing communication and dry contact interfaces as described above is characterized in that: the main control circuit includes a single-chip microcomputer U3, pin 1 of the single-chip microcomputer U3 is connected to a 5V power supply, pins 2 and 4 of the single-chip microcomputer U3 are respectively connected to a communication on-off drive circuit, pin 3 of the single-chip microcomputer U3 is connected to a dry contact on-off drive circuit, pin 10 of the single-chip microcomputer U3 is connected to a dry node signal detection circuit, pins 11-13 of the single-chip microcomputer U3 are respectively connected to the communication circuit, and pin 14 of the single-chip microcomputer U3 is grounded.

[0014] The control linkage circuit for multiplexing communication and dry contact interface as described above is characterized in that the communication signal received by the multiplexing terminal is a 485 communication signal.

[0015] The control linkage circuit for multiplexing communication and dry contact interfaces as described above is characterized in that the dry contact signal received by the multiplexing terminal is a voltage signal.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model uses a multi-channel relay to connect the Modbus485 interface and the dry contact interface to the relay, and realizes multiplexing through the switch control of the relay, thereby achieving higher signal isolation and electrical isolation and reducing the influence of interference and noise.

[0018] 2. The utility model saves hardware resources, reuses the 485 communication interface and the dry node interface into one port, can save the serial port or interface resources on the device, and improve the utilization rate of the device.

[0019] 3. The utility model simplifies wiring and installation. The communication signal line and the control signal line only need to be connected to one port, which can reduce the complexity of wiring and the workload of installation, and reduce costs and risks.

[0020] 4. The utility model improves the scalability of the system. By multiplexing ports, other functions or interfaces can be easily expanded, thereby improving the flexibility and scalability of the system.

[0021] 5. The utility model reduces equipment costs. By reusing ports, the number and cost of equipment can be reduced, thereby improving the economy of the overall system. [Drawings]

[0022] Figure 1 This is a circuit structure diagram of the utility model. [Specific implementation method]

[0023] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "preferred", "sub-preferred", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "preferred" or "sub-preferred" may explicitly or implicitly include at least one of the features.

[0025] like Figure 1 As shown, a control linkage circuit for multiplexing communication and dry contact interfaces includes a multiplexing terminal 1 that can receive communication signals and dry contact signals, the output end of the multiplexing terminal 1 is connected with a dry contact signal detection circuit 2 for detecting whether the signal received by the multiplexing terminal 1 is a dry contact signal, a dry contact on-off driving circuit 3 for controlling the on-off of the dry contact, a communication circuit 4 for communicating with the multiplexing terminal 1, and a communication on-off driving circuit 5 for controlling the on-off of communication between the multiplexing terminal 1 and the communication circuit 4, the multiplexing circuit also includes a main control circuit 6 connected to the dry contact signal detection circuit 2, the dry contact on-off driving circuit 3, the communication circuit 4, and the communication on-off driving circuit 5, respectively, to control the dry contact on-off driving circuit 3 to connect the dry contact when the dry contact signal detection circuit 2 detects the dry contact signal, and to control the communication on-off driving circuit 5 to drive the communication circuit 4 to communicate when the dry contact signal detection circuit 2 does not detect the dry contact signal. Among them, the communication signal received by the multiplexing terminal 1 is a 485 communication signal; the dry contact signal received by the multiplexing terminal 1 is a voltage signal.

[0026] When in use, the 485 communication line is connected to the multiplexing terminal 1, and the multiplexing terminal 1 is the connection point of the dry node signal line. When there is a dry contact signal input to the dry node signal line, that is, a voltage signal input, at this time, after the dry node signal detection circuit 2 detects that the signal received by the multiplexing terminal 1 is a voltage signal, a dry contact detection signal is sent to the main control circuit 6. When the main control circuit 6 detects the dry contact signal, the dry contact on-off drive circuit 3 is controlled to work, so that the dry contact is connected to trigger other devices to act; when there is a communication signal input to the 485 communication line, at this time, the dry node signal detection circuit 2 does not detect that the multiplexing terminal 1 receives a voltage signal, and thus does not send a dry contact detection signal to the main control circuit 6. When the main control circuit 6 does not detect the dry contact signal, the communication on-off drive circuit 5 is controlled to work, so that the multiplexing terminal 1 is connected to the communication circuit 4 for communication.

[0027] like Figure 1As shown, the multiplexing terminal 1 is a 2PIN connection terminal J1; the dry contact signal detection circuit 2 includes a detection chip U1, the detection chip U1 pin 1 is connected to the pin 1 of the connection terminal J1, the detection chip U1 pin 2 is connected to the pin 2 of the connection terminal J1, the detection chip U3 pin is grounded, and the detection chip U1 pin 4 is connected to one end of the resistor R7 and the main control circuit 6 through the resistor R4, and the other end of the resistor R7 is grounded. When the multiplexing terminal 1 receives the dry contact signal, the detection chip U1 detects the voltage signal and sends the received dry contact detection signal to the main control circuit 6.

[0028] like Figure 1 As shown, the dry contact on-off driving circuit 3 includes a relay RY2, the pin 1 of the relay RY2 is connected to the collector of the transistor Q2, the base of the transistor Q2 is connected to one end of the resistor R6 and one end of the resistor R5 respectively, the other end of the resistor R5 is connected to the main control circuit 6, the other end of the resistor R6 and the emitter of the transistor Q2 are grounded respectively, the pin 2 of the relay RY2 is connected to the 5V power supply, the pin 3 of the relay RY2 is connected to the pin 1 of the connection terminal J1, and the pin 4 of the relay RY2 is connected to the pin 2 of the connection terminal J1. When the main control circuit 6 controls the dry node to be connected, the transistor Q2 is controlled to be turned on, so that the relay RY2 is powered on to close the controlled switch, so that the dry contact is connected to trigger the action of other devices.

[0029] like Figure 1As shown, the communication circuit 4 includes a communication chip U2, the communication chip U2 pins 1-4 are respectively connected to the main control circuit 6, the communication chip U2 pin 5 is grounded, the communication chip U2 pins 6-7 are connected to the communication on-off drive circuit 5, the communication chip U2 pin 8 is connected to the 5V power supply, and the communication chip U2 is an RS485 communication chip; the communication on-off drive circuit 5 includes a relay RY1 and a relay RY3, the relay RY1 pin 1 is connected to the collector of the transistor Q1, the base of the transistor Q1 is respectively connected to one end of the resistor R2 and one end of the resistor R1, the other end of the resistor R1 is connected to the main control circuit 6, the other end of the resistor R2 and the emitter of the transistor Q1 are respectively Ground, relay RY1 pin 2 is connected to 5V power supply, relay RY1 pin 3 is connected to pin 1 of connection terminal J1, and relay RY1 pin 4 is connected to communication circuit 4 through resistor R3; relay RY3 pin 1 is connected to 5V power supply, relay RY3 pin 2 is connected to transistor Q3 collector, transistor Q3 base is connected to one end of resistor R9 and one end of resistor R10 respectively, the other end of resistor R10 is connected to main control circuit 6, the other end of resistor R9 and transistor Q3 emitter are grounded respectively, relay RY3 pin 3 is connected to communication circuit 4 through resistor R8, and relay RY3 pin 4 is connected to pin 2 of connection terminal J1. When main controller 6 controls communication connection, it controls transistor Q1 and transistor Q3 to conduct respectively, thereby controlling relay RY1 and relay RY3 to close their respective controlled switches, so that the two 485 communication lines of connection terminal J1 are connected to communication chip U2 respectively.

[0030] like Figure 1 As shown, the main control circuit 6 includes a single-chip microcomputer U3, the single-chip microcomputer U3 pin 1 is connected to a 5V power supply, the single-chip microcomputer U3 pin 2 and pin 4 are respectively connected to a communication on-off drive circuit 5, the single-chip microcomputer U3 pin 3 is connected to a dry contact on-off drive circuit 3, the single-chip microcomputer U3 pin 10 is connected to a dry node signal detection circuit 2, the single-chip microcomputer U3 pins 11-13 are respectively connected to a communication circuit 4, and the single-chip microcomputer U3 pin 14 is grounded. When the dry node signal detection circuit 2 detects a dry contact detection signal, the single-chip microcomputer U3 controls the dry contact on-off drive circuit 3 to work and connect the dry contact; when the dry node signal detection circuit 2 does not detect a dry contact detection signal, the single-chip microcomputer U3 controls the communication on-off drive circuit 5 to work so that the multiplexing terminal 1 is connected to the communication circuit 4 for communication.

[0031] like Figure 1As shown, the connection terminal J1 is the connection point of the dry contact. When a dry contact signal is connected, the detection signal is detected by the detection chip U1 and output through V_OUT. If there is a voltage signal at the dry contact, when the single-chip microcomputer U3 detects the detection signal output by V_OUT, the control relay RY2 is turned on. At this time, the dry contact is turned on to trigger other devices to achieve linkage; when the connection terminal J1 is connected to a 485 signal, there is no output at the V_OUT point. When the single-chip microcomputer U3 detects that there is no output at the V_OUT point, it is determined to be a 485 signal. When the single-chip microcomputer detects a 485 signal, the control relays RY1 and RY2 are turned on. At this time, the 485 communication lines A and B are connected to the communication chip U2 to communicate and exchange data.

[0032] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the utility model concept, or directly or indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A control linkage circuit for multiplexing communication and dry contact interfaces, characterized in that: The invention comprises a multiplexing terminal (1) capable of receiving a communication signal and a dry contact signal. The output end of the multiplexing terminal (1) is connected with a dry contact signal detection circuit (2) for detecting whether the signal received by the multiplexing terminal (1) is a dry contact signal, a dry contact on-off driving circuit (3) for controlling the on-off of the dry contact, a communication circuit (4) for communicating with the multiplexing terminal (1), and a communication on-off driving circuit (5) for controlling the on-off of communication between the multiplexing terminal (1) and the communication circuit (4). The control linkage circuit also comprises a main control circuit (6) respectively connected with the dry contact signal detection circuit (2), the dry contact on-off driving circuit (3), the communication circuit (4), and the communication on-off driving circuit (5); when the dry contact signal detection circuit (2) detects the dry contact signal, the dry contact on-off driving circuit (3) is controlled to connect the dry contact; and when the dry contact signal detection circuit (2) does not detect the dry contact signal, the communication on-off driving circuit (5) is controlled to drive the communication circuit (4) to perform communication operation.

2. A control linkage circuit for multiplexing communication and dry contact interfaces according to claim 1, characterized in that: The multiplexed terminal (1) is a 2-pin connection terminal J1.

3. A control linkage circuit for multiplexing communication and dry contact interfaces according to claim 2, characterized in that: The dry node signal detection circuit (2) comprises a detection chip U1, wherein pin 1 of the detection chip U1 is connected to pin 1 of the connection terminal J1, pin 2 of the detection chip U1 is connected to pin 2 of the connection terminal J1, pin 3 of the detection chip U1 is grounded, pin 4 of the detection chip U1 is respectively connected to one end of a resistor R7 and a main control circuit (6) via a resistor R4, and the other end of the resistor R7 is grounded.

4. A control linkage circuit for multiplexing communication and dry contact interfaces according to claim 2, characterized in that: The dry contact on-off drive circuit (3) comprises a relay RY2, wherein a pin 1 of the relay RY2 is connected to a collector of a transistor Q2, a base of the transistor Q2 is respectively connected to one end of a resistor R6 and one end of a resistor R5, the other end of the resistor R5 is connected to a main control circuit (6), the other end of the resistor R6 and an emitter of the transistor Q2 are respectively grounded, a pin 2 of the relay RY2 is connected to a 5V power supply, a pin 3 of the relay RY2 is connected to a pin 1 of a connection terminal J1, and a pin 4 of the relay RY2 is connected to a pin 2 of the connection terminal J1.

5. A control linkage circuit for multiplexing communication and dry contact interfaces according to claim 2, characterized in that: The communication circuit (4) includes a communication chip U2, wherein pins 1-4 of the communication chip U2 are respectively connected to the main control circuit (6), pin 5 of the communication chip U2 is grounded, pins 6-7 of the communication chip U2 are connected to the communication on-off drive circuit (5), and pin 8 of the communication chip U2 is connected to a 5V power supply.

6. A control linkage circuit for multiplexing communication and dry contact interfaces according to claim 5, characterized in that: The communication chip U2 is an RS485 communication chip.

7. A control linkage circuit for multiplexing communication and dry contact interfaces according to claim 2, characterized in that: The communication on-off drive circuit (5) comprises a relay RY1 and a relay RY3, wherein the pin 1 of the relay RY1 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to one end of the resistor R2 and one end of the resistor R1 respectively, the other end of the resistor R1 is connected to the main control circuit (6), the other end of the resistor R2 and the emitter of the transistor Q1 are grounded respectively, the pin 2 of the relay RY1 is connected to a 5V power supply, the pin 3 of the relay RY1 is connected to the pin 1 of the connection terminal J1, and the pin 4 of the relay RY1 is connected to the communication circuit (4) through the resistor R3; the pin 1 of the relay RY3 is connected to the 5V power supply, the pin 2 of the relay RY3 is connected to the collector of the transistor Q3, the base of the transistor Q3 is connected to one end of the resistor R9 and one end of the resistor R10 respectively, the other end of the resistor R10 is connected to the main control circuit (6), the other end of the resistor R9 and the emitter of the transistor Q3 are grounded respectively, the pin 3 of the relay RY3 is connected to the communication circuit (4) through the resistor R8, and the pin 4 of the relay RY3 is connected to the pin 2 of the connection terminal J1.

8. A control linkage circuit for multiplexing communication and dry contact interfaces according to claim 1, characterized in that: The main control circuit (6) includes a single-chip microcomputer U3, wherein pin 1 of the single-chip microcomputer U3 is connected to a 5V power supply, pins 2 and 4 of the single-chip microcomputer U3 are respectively connected to a communication on / off drive circuit (5), pin 3 of the single-chip microcomputer U3 is connected to a dry contact on / off drive circuit (3), pin 10 of the single-chip microcomputer U3 is connected to a dry contact signal detection circuit (2), pins 11-13 of the single-chip microcomputer U3 are respectively connected to a communication circuit (4), and pin 14 of the single-chip microcomputer U3 is grounded.

9. A control linkage circuit for multiplexing communication and dry contact interfaces according to claim 1, characterized in that: The communication signal received by the multiplexing terminal (1) is a 485 communication signal.

10. A control linkage circuit for multiplexing communication and dry contact interfaces according to claim 1, characterized in that: The dry node signal received by the multiplexing terminal (1) is a voltage signal.

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