CN219592416U - Isolated RS485 bus communication system - Google Patents
Isolated RS485 bus communication system Download PDFInfo
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- CN219592416U CN219592416U CN202222557508.4U CN202222557508U CN219592416U CN 219592416 U CN219592416 U CN 219592416U CN 202222557508 U CN202222557508 U CN 202222557508U CN 219592416 U CN219592416 U CN 219592416U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The utility model relates to an isolated RS485 bus communication system, which adopts two high-speed photoelectric couplers to perform receiving and transmitting isolation of RS485 communication, adopts a low-speed photoelectric coupler to perform control isolation, realizes an isolation function on the premise of ensuring high-speed communication of RS458, reasonably controls cost and has high cost performance.
Description
Technical Field
The present utility model relates to an RS485 bus communication system, and in particular, to an isolated RS485 bus communication system.
Background
In the prior art, the RS485 bus is widely applied in a plurality of control fields due to high reliability. In view of the complexity of the application environment, isolation processing is often performed on the power supply and control and communication ports. The common practice in the market is to integrate an isolated power module and an integrated communication port isolation module, and the communication port isolation module is especially an isolation module for high-speed communication, and the communication port isolation module is mainly dependent on an imported chip scheme at present, so that the cost is generally high and the cost performance is low.
Disclosure of Invention
In view of the above problems, the present utility model provides an isolated RS485 bus communication system, which includes a first high-speed photo-coupler U15, a second high-speed photo-coupler U6, a low-speed photo-coupler U14, and a communication transceiver U19, wherein the types of the first high-speed photo-coupler U15 and the second high-speed photo-coupler U6 are TLP118, the type of the low-speed photo-coupler U14 is TLP281, the type of the communication transceiver U19 is MAX485ESA, and the specific circuit is: the first high-speed photoelectric coupler U15 pin 1 is connected to a power supply 5V_485 through a resistor R87, the first high-speed photoelectric coupler U15 pin 3 is connected to the 1 st pin of the communication transceiver U19, the first high-speed photoelectric coupler U15 pin 4 is grounded, the first high-speed photoelectric coupler U15 pin 5 is connected to a serial port receiving end USART1_RX of the singlechip through a resistor R72, the first high-speed photoelectric coupler U15 pin 5 is also connected to a 3V3 power supply through a resistor R12, the first high-speed photoelectric coupler U15 pin 6 is connected to a 5V power supply, the first high-speed photoelectric coupler U15 pin 6 is also grounded through a capacitor C18, the second high-speed photoelectric coupler U6 pin 1 is connected to a 3V3 power supply through a resistor R77, the second high-speed photoelectric coupler U6 pin 3 is connected to a serial port transmitting end USART1_TX of the singlechip through a resistor R73, the second high-speed coupler U6 pin 4 is grounded, the 5 th pin of the second high-speed photoelectric coupler U6 is connected to a power supply 5V_485 through a resistor R88, the 6 th pin of the second high-speed photoelectric coupler U6 is connected to the power supply 5V_485, the 6 th pin of the second high-speed photoelectric coupler U6 is also connected to the ground GND_485 through a capacitor C20, the 1 st pin of the low-speed photoelectric coupler U14 is connected to a control end 485OE of the singlechip through a resistor R75, the 2 nd pin of the low-speed photoelectric coupler U14 is grounded, the 3 rd pin of the low-speed photoelectric coupler U14 is connected to a test point TP41, the 3 rd pin of the low-speed photoelectric coupler U14 is also connected to the ground GND_485 through a resistor R80, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are both connected to the test point TP41, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are both connected to the 3 rd pin of the low-speed photoelectric coupler U14, the 4 th pin of the communication transceiver U19 is connected to the 5 th pin of the second high-speed photoelectric coupler U14, the 5 th pin of the communication transceiver U19 is connected to the 5 th pin of the test point, the 5 th pin of the communication transceiver U19 is grounded to the GND_485, the 6 th pin of the communication transceiver U19 is connected to a power supply 5V_485 through a resistor R89, the 6 th pin of the communication transceiver U19 is also connected to the ground GND_485 through a capacitor C73, the 6 th pin of the communication transceiver U19 is also connected to the first end of a resistor R91, the second end of the resistor R91 is connected to an A end RS485A of an RS485 bus, the second end of the resistor R91 is also connected to the ground GND_485 through a capacitor C75 and a first reverse diode Q4 which are connected in parallel, the 7 th pin of the communication transceiver U19 is connected to the ground GND_485 through a resistor R90 and a capacitor C72 which are connected in parallel, the 7 th pin of the communication transceiver U19 is also connected to the first end of a resistor R92, the second end of the resistor R92 is connected to a B end RS485B of the RS485 bus, the second end of the resistor R92 is also connected to the ground GND_485 through a capacitor C74 and a second reverse diode Q4 which are connected in parallel, the 8 th pin of the communication transceiver U19 is also connected to the power supply 5V_485, the 8 th pin of the communication transceiver U19 is also connected to the ground GND_485 through a capacitor C70 and a capacitor C71 which are connected in parallel;
when the signal of the control end 485OE of the singlechip is at a high level, the low-speed photoelectric coupler U14 is conducted, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are at a high level, and at the moment, the communication transceiver U19 transmits effective signals; the serial port transmitting end USART1_TX of the singlechip transmits data, the data transmitted by the serial port transmitting end USART1_TX of the singlechip is transmitted to the communication transceiver U19 after being isolated by the second high-speed photoelectric coupler U6, and the data is converted into an RS485 level signal through the communication transceiver U19 and enters an RS485 bus;
when the signal of the control end 485OE of the single chip microcomputer is at a low level, the low-speed photoelectric coupler U14 is not conducted, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are at a low level, at this time, the communication transceiver U19 receives and is effective, the data to be transmitted by the RS485 bus are captured by the communication transceiver U19 through the a port of the 6 th pin and the B port of the 7 th pin, and are converted into serial data of TTL level, and the serial data are sent to the input end of the first high-speed photoelectric coupler U15, namely the 1 st pin and the 3 rd pin of the first high-speed photoelectric coupler U15, and after the data are isolated by the first high-speed photoelectric coupler U15, the serial data are sent to the serial port receiving end usart1_rx of the single chip microcomputer, and are analyzed by the single chip microcomputer.
Further, the signal received by the serial port receiving end USART1_RX of the singlechip is a TTL level signal.
Further, a signal sent by a serial port sending end USART1_TX of the singlechip is a TTL level signal.
Further, the signal of the control end 485OE of the singlechip is a TTL level signal.
According to the isolated RS485 bus communication system provided by the utility model, two high-speed photoelectric couplers are adopted for receiving and transmitting the RS485 communication, and a low-speed photoelectric coupler is used for controlling and isolating, so that the isolation function is realized on the premise of guaranteeing the high-speed communication of RS458, the cost is reasonably controlled, and the cost performance is very high.
Drawings
Fig. 1 is a schematic circuit diagram of an isolated RS485 bus communication system according to the utility model.
Detailed Description
For a further understanding of the objects, construction, features, and functions of the utility model, reference should be made to the following detailed description of the preferred embodiments.
The utility model provides an isolated RS485 bus communication system, referring to fig. 1, fig. 1 is a schematic circuit diagram of the isolated RS485 bus communication system of the utility model, which comprises a first high-speed photoelectric coupler U15, a second high-speed photoelectric coupler U6, a low-speed photoelectric coupler U14 and a communication transceiver U19, wherein the types of the first high-speed photoelectric coupler U15 and the second high-speed photoelectric coupler U6 are TLP118, the type of the low-speed photoelectric coupler U14 is TLP281, the type of the communication transceiver U19 is MAX485ESA, and the specific circuit is as follows: the first high-speed photoelectric coupler U15 pin 1 is connected to a power supply 5V_485 through a resistor R87, the first high-speed photoelectric coupler U15 pin 3 is connected to the 1 st pin of the communication transceiver U19, the first high-speed photoelectric coupler U15 pin 4 is grounded, the first high-speed photoelectric coupler U15 pin 5 is connected to a serial port receiving end USART1_RX of the singlechip through a resistor R72, the first high-speed photoelectric coupler U15 pin 5 is also connected to a 3V3 power supply through a resistor R12, the first high-speed photoelectric coupler U15 pin 6 is connected to a 5V power supply, the first high-speed photoelectric coupler U15 pin 6 is also grounded through a capacitor C18, the second high-speed photoelectric coupler U6 pin 1 is connected to a 3V3 power supply through a resistor R77, the second high-speed photoelectric coupler U6 pin 3 is connected to a serial port transmitting end USART1_TX of the singlechip through a resistor R73, the second high-speed coupler U6 pin 4 is grounded, the 5 th pin of the second high-speed photoelectric coupler U6 is connected to a power supply 5V_485 through a resistor R88, the 6 th pin of the second high-speed photoelectric coupler U6 is connected to the power supply 5V_485, the 6 th pin of the second high-speed photoelectric coupler U6 is also connected to the ground GND_485 through a capacitor C20, the 1 st pin of the low-speed photoelectric coupler U14 is connected to a control end 485OE of the singlechip through a resistor R75, the 2 nd pin of the low-speed photoelectric coupler U14 is grounded, the 3 rd pin of the low-speed photoelectric coupler U14 is connected to a test point TP41, the 3 rd pin of the low-speed photoelectric coupler U14 is also connected to the ground GND_485 through a resistor R80, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are both connected to the test point TP41, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are both connected to the 3 rd pin of the low-speed photoelectric coupler U14, the 4 th pin of the communication transceiver U19 is connected to the 5 th pin of the second high-speed photoelectric coupler U14, the 5 th pin of the communication transceiver U19 is connected to the 5 th pin of the test point, the 5 th pin of the communication transceiver U19 is grounded to the GND_485, the 6 th pin of the communication transceiver U19 is connected to a power supply 5V_485 through a resistor R89, the 6 th pin of the communication transceiver U19 is also connected to the ground GND_485 through a capacitor C73, the 6 th pin of the communication transceiver U19 is also connected to the first end of a resistor R91, the second end of the resistor R91 is connected to an A end RS485A of an RS485 bus, the second end of the resistor R91 is also connected to the ground GND_485 through a capacitor C75 and a first reverse diode Q4 which are connected in parallel, the 7 th pin of the communication transceiver U19 is connected to the ground GND_485 through a resistor R90 and a capacitor C72 which are connected in parallel, the 7 th pin of the communication transceiver U19 is also connected to the first end of a resistor R92, the second end of the resistor R92 is connected to a B end RS485B of the RS485 bus, the second end of the resistor R92 is also connected to the ground GND_485 through a capacitor C74 and a second reverse diode Q4 which are connected in parallel, the 8 th pin of the communication transceiver U19 is also connected to the power supply 5V_485, the 8 th pin of the communication transceiver U19 is also connected to the ground GND_485 through a capacitor C70 and a capacitor C71 which are connected in parallel; the internal circuit uses the independent ground GND, and the external circuit uses the independent ground gnd_485, so that the internal circuit is prevented from being damaged due to voltage fluctuation of the external circuit.
When the signal of the control end 485OE of the singlechip is at a high level, the low-speed photoelectric coupler U14 is conducted, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are at a high level, and at the moment, the communication transceiver U19 transmits effective signals; the serial port transmitting end USART1_TX of the singlechip transmits data, the data transmitted by the serial port transmitting end USART1_TX of the singlechip is transmitted to the communication transceiver U19 after being isolated by the second high-speed photoelectric coupler U6, and the data is converted into an RS485 level signal through the communication transceiver U19 and enters an RS485 bus; when the signal of the control end 485OE of the single chip microcomputer is at a low level, the low-speed photoelectric coupler U14 is not conducted, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are at a low level, at this time, the communication transceiver U19 receives and is effective, the data to be transmitted by the RS485 bus are captured by the communication transceiver U19 through the a port of the 6 th pin and the B port of the 7 th pin, and are converted into serial data of TTL level, and the serial data are sent to the input end of the first high-speed photoelectric coupler U15, namely the 1 st pin and the 3 rd pin of the first high-speed photoelectric coupler U15, and after the data are isolated by the first high-speed photoelectric coupler U15, the serial data are sent to the serial port receiving end usart1_rx of the single chip microcomputer, and are analyzed by the single chip microcomputer.
Above, the signal received by the serial port receiving end usart1_rx of the single chip microcomputer is a TTL level signal, the signal sent by the serial port sending end usart1_tx of the single chip microcomputer is a TTL level signal, and the signal of the control end 485OE of the single chip microcomputer is a TTL level signal. TTL level signals, i.e., transistor-transistor logic level signals, are standard techniques for communication between parts within a computer processor controlled device, +5v is equivalent to a logic "1" and 0V is equivalent to a logic "0".
According to the isolated RS485 bus communication system provided by the utility model, two high-speed photoelectric couplers are adopted for receiving and transmitting the RS485 communication, and a low-speed photoelectric coupler is used for controlling and isolating, so that the isolation function is realized on the premise of guaranteeing the high-speed communication of RS458, the cost is reasonably controlled, and the cost performance is very high.
The utility model has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of practicing the utility model. It should be noted that the disclosed embodiments do not limit the scope of the utility model. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.
Claims (4)
1. The utility model provides an isolation type RS485 bus communication system which is characterized in that, this isolation type RS485 bus communication system includes a first high-speed photoelectric coupler U15, a second high-speed photoelectric coupler U6, a low-speed photoelectric coupler U14 and a communication transceiver U19, wherein, the model of this first high-speed photoelectric coupler U15 and this second high-speed photoelectric coupler U6 is TLP118, the model of this low-speed photoelectric coupler U14 is TLP281, the model of this communication transceiver U19 is MAX485ESA, concretely the circuit is: the first high-speed photoelectric coupler U15 pin 1 is connected to a power supply 5V_485 through a resistor R87, the first high-speed photoelectric coupler U15 pin 3 is connected to the 1 st pin of the communication transceiver U19, the first high-speed photoelectric coupler U15 pin 4 is grounded, the first high-speed photoelectric coupler U15 pin 5 is connected to a serial port receiving end USART1_RX of the singlechip through a resistor R72, the first high-speed photoelectric coupler U15 pin 5 is also connected to a 3V3 power supply through a resistor R12, the first high-speed photoelectric coupler U15 pin 6 is connected to a 5V power supply, the first high-speed photoelectric coupler U15 pin 6 is also grounded through a capacitor C18, the second high-speed photoelectric coupler U6 pin 1 is connected to a 3V3 power supply through a resistor R77, the second high-speed photoelectric coupler U6 pin 3 is connected to a serial port transmitting end USART1_TX of the singlechip through a resistor R73, the 4 th pin of the second high-speed photoelectric coupler U6 is grounded, the 5 th pin of the second high-speed photoelectric coupler U6 is connected to a power supply 5V_485 through a resistor R88, the 6 th pin of the second high-speed photoelectric coupler U6 is connected to the power supply 5V_485, the 6 th pin of the second high-speed photoelectric coupler U6 is also grounded GND_485 through a capacitor C20, the 1 st pin of the low-speed photoelectric coupler U14 is connected to a control end 485OE of the singlechip through a resistor R75, the 2 nd pin of the low-speed photoelectric coupler U14 is grounded, the 3 rd pin of the low-speed photoelectric coupler U14 is connected to a test point TP41, the 3 rd pin of the low-speed photoelectric coupler U14 is also grounded GND_485 through a resistor R80, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are both connected to the test point TP41, the 2 nd pin and the 3 rd pin of the communication transceiver U19 are both connected to the 3 rd pin of the low-speed photoelectric coupler U14, the 4 th pin of the communication transceiver U19 is connected to the 5 th pin of the second high-speed optocoupler U6, the 5 th pin of the communication transceiver U19 is grounded gnd_485, the 6 th pin of the communication transceiver U19 is connected to the power supply 5v_485 through a resistor R89, the 6 th pin of the communication transceiver U19 is also grounded gnd_485 through a capacitor C73, the 6 th pin of the communication transceiver U19 is also connected to the first end of a resistor R91, the second end of the resistor R91 is connected to the a-terminal RS485A of the RS485 bus, the second end of the resistor R91 is also connected to the ground gnd_485 through a capacitor C75 and a first reverse diode Q4 connected in parallel, the 7 th pin of the communication transceiver U19 is also connected to the ground gnd_485 through a resistor R90 and a capacitor C72 connected in parallel, the 7 th pin of the communication transceiver U19 is also connected to the first end of a resistor R92, the second end of the resistor R92 is also connected to the B-terminal RS485B end of the RS485 through a capacitor C73, the second end of the resistor R92 is also connected to the ground gnd_485 through a capacitor C74 and a capacitor C8 connected in parallel, the second end of the resistor R92 is also connected to the communication transceiver Q8 is connected to the ground 485 through a capacitor C8.
2. The isolated RS485 bus communication system according to claim 1, wherein the signal received by the serial port receiving end usart1_rx of the single chip microcomputer is a TTL level signal.
3. The isolated RS485 bus communication system according to claim 1, wherein the signal transmitted by the serial port transmitting end usart1_tx of the single chip microcomputer is a TTL level signal.
4. The isolated RS485 bus communication system according to claim 1, wherein the signal of the control end 485OE of the single chip microcomputer is a TTL level signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222557508.4U CN219592416U (en) | 2022-09-27 | 2022-09-27 | Isolated RS485 bus communication system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222557508.4U CN219592416U (en) | 2022-09-27 | 2022-09-27 | Isolated RS485 bus communication system |
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| Publication Number | Publication Date |
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| CN219592416U true CN219592416U (en) | 2023-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222557508.4U Active CN219592416U (en) | 2022-09-27 | 2022-09-27 | Isolated RS485 bus communication system |
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| CN (1) | CN219592416U (en) |
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- 2022-09-27 CN CN202222557508.4U patent/CN219592416U/en active Active
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