CN220775460U - Anti-interference communication converter - Google Patents
Anti-interference communication converter Download PDFInfo
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- CN220775460U CN220775460U CN202322374653.3U CN202322374653U CN220775460U CN 220775460 U CN220775460 U CN 220775460U CN 202322374653 U CN202322374653 U CN 202322374653U CN 220775460 U CN220775460 U CN 220775460U
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- 238000004891 communication Methods 0.000 title claims abstract description 27
- 238000002955 isolation Methods 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000008054 signal transmission Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model discloses an anti-interference communication converter, which belongs to the technical field of communication and comprises: an external power circuit for supplying power; the first conversion circuit is connected with the external power supply circuit and is used for realizing voltage conversion of the external circuit; the power isolation circuit is connected with the external power circuit and used for separating out voltage isolated from the external power circuit; the second conversion circuit is connected with the power isolation circuit, the RS485 signal receiving and transmitting circuit is connected with the first conversion circuit and is used for switching the transmitting and receiving states of 485 communication signals; the controller is connected with the RS485 signal receiving and transmitting circuit and is used for receiving, transmitting and processing signals; the utility model is connected between the host controller of the 232 bus interface and the site sensor and the actuator with 485 bus interface for bus communication, for site data acquisition or detection and control of downlink control instructions, for data transmission, automatic control and remote operation, and for data isolation transmission and prevention of a series of safety accidents caused by overvoltage.
Description
Technical Field
The utility model belongs to the technical field of communication, and particularly relates to an anti-interference communication converter.
Background
With the continuous improvement of the industrial automation degree, the application of automatic control is higher and higher, and the communication between the on-site sensor and the controller is indispensable. Because 485 bus has the advantages of long transmission distance, supporting multiple computers to access network for communication, the communication interface of the site sensor mostly adopts 485 mode, and 232 is one of the communication interfaces on the computer, which is widely used in microcomputer communication interfaces at present. However, the existing 485 bus and 232 bus cannot directly transmit signals, because the industrial environment is complex, electromagnetic interference may be generated in the environment, communication is directly connected, equipment may be damaged in a large area, and accordingly the influence is enlarged, and common 485 data lines and 232 data lines cannot be directly used in places with explosion hazards.
Disclosure of Invention
The present utility model provides an anti-interference communication converter to solve the above-mentioned problems in the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: an anti-interference communication converter comprising:
an external power circuit for supplying power;
the first conversion circuit is connected with the external power supply circuit and is used for realizing voltage conversion of the external circuit;
the power isolation circuit is connected with the external power circuit and used for separating out voltage isolated from the external power circuit;
the second conversion circuit is connected with the power isolation circuit and used for converting the separated voltage;
the RS485 signal receiving and transmitting circuit is connected with the first conversion circuit and used for switching the transmitting and receiving states of 485 communication signals;
the controller is connected with the RS485 signal receiving and transmitting circuit and is used for receiving, transmitting and processing signals;
the RS232 signal receiving and transmitting circuit is connected with the second conversion circuit;
and the signal isolation circuit is connected with the RS485 signal receiving and transmitting circuit and the RS232 signal receiving and transmitting circuit.
Further, the power isolation circuit is isolated by a DC-DC power module, so that the isolation voltage reaches 2500V.
Further, linear voltage stabilizing chips are arranged in the first conversion circuit and the second conversion circuit.
Further, the external power supply circuit is a 12V direct current power supply.
Preferably, the method comprises the steps of,
compared with the prior art, the utility model has the beneficial effects that:
the utility model is connected between a host controller of a 232 bus interface and a site sensor and an actuator with 485 bus interfaces for bus communication, for site data acquisition or detection and control of downlink control instructions, for data transmission, automatic control and remote operation, and for data isolation transmission and prevention of a series of safety accidents caused by overvoltage;
the design of the chip and the circuit is utilized, the circuit is simplified, the interference of the environment to signal transmission is reduced by the RS485 signal receiving and transmitting circuit, the safety and the reliability of the converter are improved by the power isolation circuit and the signal isolation circuit, the signal transmission rate is improved by the signal isolation circuit, the working efficiency is improved, the communication between the industrial personal computer and the controller is effectively isolated, and the interference generated in the environment is not influenced; the converter is compatible with RS232 and RS485 signals, and can convert a single-ended RS232 signal into a balanced differential RS485 signal.
Drawings
Fig. 1 is a circuit block diagram of an anti-interference communication converter according to the present utility model.
Fig. 2 is a schematic diagram of a signal isolation conversion circuit according to the present utility model.
Fig. 3 is a schematic diagram of the power isolation of the present utility model.
Fig. 4 is a schematic diagram of the voltage stabilizing of the power supply of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-4, the present utility model provides the following technical solutions:
an anti-tamper communication converter connected between a host controller having a 232 bus interface and a site sensor and actuator having a 485 bus interface, comprising: an external power circuit for supplying power and setting the external power circuit as a 12V direct current power supply; the first conversion circuit is connected with the external power supply circuit and is used for realizing voltage conversion of the external circuit, and linear voltage stabilizing chips are arranged in the first conversion circuit and are used for converting 12V voltage into 5V voltage; the power isolation circuit is connected with the external power circuit and used for separating 9V direct current voltage isolated from 12V of the external power supply, so that the power consumption of a connected voltage stabilizing chip is reduced, heating is reduced, and the power isolation circuit is isolated through a DC-DC power module, so that the isolated voltage reaches 2500V; the second conversion circuit is connected with the power isolation circuit and used for converting the separated voltage, and linear voltage stabilizing chips are arranged in the second conversion circuit and used for converting 9V voltage into 5V voltage; the RS485 signal receiving and transmitting circuit is connected with the first conversion circuit and used for switching the transmitting and receiving states of 485 communication signals, and is provided with an RS485 chip, and the model is MAX13487; the controller is connected with the RS485 signal receiving and transmitting circuit and is used for receiving, transmitting and processing signals; the RS232 signal receiving and transmitting circuit is connected with the second conversion circuit and is provided with an RS232 chip, and the model is MAX3232ESE; the signal isolation circuit is connected with the RS485 signal receiving and transmitting circuit and the RS232 signal receiving and transmitting circuit and is used for isolating interference signals and preventing the interference signals from being transmitted, so that all components on two sides are damaged, and a signal isolation chip is arranged, and the model is ADUM1201CRZ-RL7.
Specifically, firstly, the converter is powered by an external 12V direct current power supply, then the voltage is converted into two relatively independent 5V power supply voltages by a first conversion circuit, a power isolation circuit and a second conversion circuit by a linear voltage stabilizing chip, the two relatively independent 5V power supply voltages are respectively powered by an RS232 chip and an RS485 chip, the power supply is completely isolated, a signal is sent out by an industrial personal computer, the signal is converted into TTL by the RS232 chip, the signal is transmitted to the RS485 chip by the signal isolation chip, and the signal is processed by the RS485 chip and then is sent to a controller; after the signals are processed by the controller, the controller sends the signals to the converter, the signals sequentially pass through the RS485 chip, the signal isolation chip and the RS232 chip, and then the signals are transmitted to the industrial personal computer, and a series of control is completed through the process; the converter receives signals sent by the industrial personal computer, converts the RS232 signals into TTL signals through the RS232 chip, transmits the signals to the RS485 chip through the signal isolation chip, converts the TTL signals into the RS485 signals identified by the controller through the RS485 chip, and then converts the signals to be sent to the industrial personal computer.
In the embodiment, the signal transmission comprises a DC-DC power isolation module U4, linear voltage stabilizing chips U5 and U6, an RS485 automatic receiving and transmitting chip U1, a signal isolation chip U3, an RS232 signal conversion chip U2 and a wiring terminal JP1; after the signals are input from the JP1 terminal and converted into TTL signals through the RS232 chip U2, the signals are sent to the RS485 chip U1 through the signal isolation chip U3, the signals are converted into differential mode signals sent out by two pins of the RS485 chip A, B, wherein the LED2 is an upper computer signal sending indicator lamp, and the LED3 is an upper computer signal receiving indicator lamp.
Specifically, the signal is input into the 10 th pin of U2 through the JP1 terminal, the signal is output to U3 through the 7 th pin after the chip is processed, the signal is transmitted to U1 through the isolation of U3, DI and RE pins of the chip are pulled up simultaneously, the function of automatic conversion transceiver of the chip is started, and the signal is transmitted to the controller through U1. After the controller processes the signals, the signals are sent out and sequentially pass through U1, U3 and U2 and then are sent to the industrial personal computer, and a series of control is completed through the process.
In this embodiment, fig. 3 is a schematic diagram of power isolation, which isolates the power supply of the RS485 chip and the RS232 chip, so as to ensure the isolation between the industrial personal computer and the controller and prevent the two from interfering with each other.
In this embodiment, fig. 4 is a schematic diagram of power supply voltage stabilization, which provides a stable operating voltage for the chip to stabilize signal transmission.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. An anti-interference communication converter, comprising:
an external power circuit for supplying power;
the first conversion circuit is connected with the external power supply circuit and is used for realizing voltage conversion of the external circuit;
the power isolation circuit is connected with the external power circuit and used for separating out voltage isolated from the external power circuit;
the second conversion circuit is connected with the power isolation circuit and used for converting the separated voltage;
the RS485 signal receiving and transmitting circuit is connected with the first conversion circuit and used for switching the transmitting and receiving states of 485 communication signals;
the controller is connected with the RS485 signal receiving and transmitting circuit and is used for receiving, transmitting and processing signals;
the RS232 signal receiving and transmitting circuit is connected with the second conversion circuit;
and the signal isolation circuit is connected with the RS485 signal receiving and transmitting circuit and the RS232 signal receiving and transmitting circuit.
2. An anti-interference communication converter according to claim 1, wherein: the power isolation circuit is isolated through a DC-DC power module, so that isolation voltage reaches 2500V.
3. An anti-interference communication converter according to claim 1, wherein: and linear voltage stabilizing chips are arranged in the first conversion circuit and the second conversion circuit.
4. An anti-interference communication converter according to claim 1, wherein: the external power supply circuit is a 12V direct current power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322374653.3U CN220775460U (en) | 2023-09-01 | 2023-09-01 | Anti-interference communication converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322374653.3U CN220775460U (en) | 2023-09-01 | 2023-09-01 | Anti-interference communication converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220775460U true CN220775460U (en) | 2024-04-12 |
Family
ID=90620660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322374653.3U Active CN220775460U (en) | 2023-09-01 | 2023-09-01 | Anti-interference communication converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220775460U (en) |
-
2023
- 2023-09-01 CN CN202322374653.3U patent/CN220775460U/en active Active
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