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Multi-bus and multi-channel interface realized in single serial port multiplexing mode

A multi-bus, single-serial-port technology, applied in instruments, electrical digital data processing, hardware monitoring, etc., can solve the problems of high cost, occupying printed circuit board area, occupying more than one serial communication port of the microcontroller, etc.

Active Publication Date: 2020-10-23
湖南慧明谦信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of designing M_BUS and RS485 bus interfaces for data acquisition terminals is to use two independent serial communication ports of the microcontroller to design the M_BUS and RS485 bus interfaces into two completely independent interface circuits. This communication interface design works stably Reliable, so it is widely used. However, this interface circuit design mostly occupies one serial communication port of the microcontroller. In addition, according to the technical specifications of the data acquisition terminal, the microcontroller must be isolated from the M_BUS and RS485 interfaces. Therefore, this interface The circuit design must use two-way isolation devices, which is costly and occupies the area of ​​the printed circuit board

Method used

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  • Multi-bus and multi-channel interface realized in single serial port multiplexing mode
  • Multi-bus and multi-channel interface realized in single serial port multiplexing mode
  • Multi-bus and multi-channel interface realized in single serial port multiplexing mode

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Embodiment 1

[0054] Such as Figure 1-7 As shown, the present invention includes an interface control circuit, a microcontroller serial port transmission / reception indicating circuit, an M_BUS bus transmission enable control circuit, an RS485 bus transmission / reception state control circuit, and a far-infrared IRD transmission / reception circuit; wherein the interface The control circuit includes an optocoupler E2 and a triode V4. The first pin of the optocoupler E2 (the anode of the light emitting tube) is connected to one end of the resistor R13, and the other end of the resistor R13 is connected to a 3.3V power supply; the second pin of the optocoupler E2 (the cathode of the light emitting tube ) is connected to the microcontroller IO pin CTR; the third pin of the optocoupler E2 (the emitter of the photoelectric receiver) is connected to the reference point G; the fourth pin of the optocoupler E2 (the collector of the photoelectric receiver) is connected to one end of the resistor R10 at ...

Embodiment 2

[0056] On the basis of Embodiment 1, the microcontroller serial port sending / receiving indication circuit includes an LED indicator HL1 and an LED indicator HL2;

[0057] The microcontroller serial port sends an indicating circuit, the first pin of the optocoupler E1 (the anode of the light-emitting tube) is connected to the cathode of the LED indicator HL1, the anode of the LED indicator HL1 is connected to the resistor R1, and the other end of the resistor R1 is connected to the 3.3V power supply; The second pin of the optocoupler E1 (cathode of the light-emitting tube) is connected to the serial transmitter TXD of the microcontroller;

[0058] The micro-controller serial port receiving indication circuit, the third pin of the optocoupler E3 (photoelectric tube emitter) is connected to the GND reference ground; the fourth pin of the optocoupler E3 (photoelectric tube collector) is connected to the microcontroller serial receiving At the same time, the fourth pin of optocoupl...

Embodiment 3

[0061] On the basis of Embodiment 1, the M_BUS bus transmission enable control circuit is characterized in that it includes the control mode adopted by the optocoupler E1 and the third pin (photoelectric tube emitter) of the optocoupler E1; The three pins (photoelectric tube emitter) are connected to the collector CTR1 of the triode V4, the model of the optocoupler E1 is LTV-816S, and the model of the diode VD2 is 1N5819W.

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Abstract

The invention discloses a multi-bus and multi-channel interface realized in a single serial port multiplexing mode and relates to the technical field of communication interface circuits of data acquisition terminals. The multi-bus and multi-channel interface comprises a data acquisition terminal communication interface circuit for M_BUS, RS485 bus and far infrared communication. The M_BUS and RS485 multi-bus data acquisition interface is realized in the single serial port multiplexing mode, and meanwhile, an integrated design of a far infrared communication interface is realized in the singleserial port multiplexing mode, and communication with handheld far infrared communication equipment is realized; only one serial communication interface of a microcontroller is used for realizing theinterface circuit, and therefore, the circuit is simple, the number of peripheral devices is small, the cost is low; under the control of the interface control circuit, when the M_BUS, the RS485 bus and far infrared communication channels work, the data sending state and the data receiving state are independent of each other and do not interfere with each other, communication is stable and reliable, and full verification is achieved in data collection engineering.

Description

technical field [0001] A multi-bus and multi-channel interface implemented in a single serial port multiplexing mode is used for M_BUS bus, RS485 bus, far-infrared IRD channel communication interface circuit and communication multiplexing. The invention relates to the technical field of communication interface circuits for data acquisition terminals. Background technique [0002] The core function of the data collection terminal is data collection, storage and data transmission. The physical layer link of data collection and transmission is composed of communication interface. The communication interface is an important circuit of the data collection terminal. Among them, M_BUS and RS485 are often There are two kinds of fieldbus interfaces. [0003] At present, the method of designing M_BUS and RS485 bus interfaces for data acquisition terminals is to use two independent serial communication ports of the microcontroller to design the M_BUS and RS485 bus interfaces into two c...

Claims

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Application Information

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IPC IPC(8): G06F13/38G06F13/42G06F11/32
CPCG06F11/325G06F13/385G06F13/4282G06F2213/0002
Inventor 汪文红方思敏
Owner 湖南慧明谦信息技术有限公司
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