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A Software Processing Method for 485 Bus Half-duplex Communication

A half-duplex communication and software processing technology, which is applied in the direction of duplex signal operation, bus network, data exchange through path configuration, etc.

Active Publication Date: 2022-05-27
XIAN FLIGHT SELF CONTROL INST OF AVIC
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  • Abstract
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  • Application Information

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Problems solved by technology

When the RS485 bus network construction method is set to two-wire mode, sending and receiving are multiplexing a group of data lines, there will be a lot of noise under the traditional bus communication, the present invention proposes a software processing method for this problem, and realizes the bus in half In duplex communication mode, high reliability data receiving and sending

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  • A Software Processing Method for 485 Bus Half-duplex Communication
  • A Software Processing Method for 485 Bus Half-duplex Communication

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: please refer to figure 1 , the RS485 bus used in the present invention adopts half-duplex, two-wire mode. Data and receive multiplexed data bus. The flight control management computer (VMC) sends data to the servo controller (ACE) every 20ms. After the ACE receives the data and the verification is correct, it sends its own status package to the VMC.

[0018] The running period of ACE is 1ms, the length of data sent by VMC to ACE is 20, the length of data sent by ACE to VMC is 30, and the baud rate of data transmission is set to 115200bps. It takes 1.4ms for 20 frames of data sent by VMC to ACE, and 2.1ms for 30 frames of data sent by ACE to VMC. In order to avoid the conflict of sending data and receiving data on the same group of multiplexed data bus, and it is required to meet the real-time performance of VMC and ACE. Therefore, the software cannot s...

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Abstract

The invention relates to a software processing method for half-duplex communication of 485 bus, including enabling operation of system sending and receiving states, timing control of system sending and receiving, and effective processing of system receiving and sending fifo. The present invention is mainly aimed at 485 in the half-duplex communication mode, data receiving and sending need time-division multiplexed data bus, during the fast data sending and receiving process, there are situations of data packet loss and error packet. The invention optimizes the control flow of data receiving and sending, and ensures the real-time and correctness of data receiving and sending under the half-duplex communication mode of the 485 bus.

Description

technical field [0001] The invention belongs to the technical field of airborne bus communication, and relates to a software processing method for 485 bus half-duplex communication. Background technique [0002] The RS485 bus is an interface standard developed from RS232. It is suitable for single-point to multi-point or multi-point communication, and makes up for the interconnection problem of the RS232 interface standard. RS485 bus is widely used in the fields of transportation, aviation, aerospace and automatic control due to its advantages of simple interface, low cost, long communication distance and high reliability. [0003] The communication mode of RS485 network is divided into two types: master-slave type and bus type. The master-slave working mode is usually adopted in industrial control, and the bus communication mode has good expansibility and versatility. When the RS485 bus works in the half-duplex communication mode, only one node can be in the sending state...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/16H04L12/40
CPCH04L5/16H04L12/40
Inventor 李泽林董少阳苏二峰
Owner XIAN FLIGHT SELF CONTROL INST OF AVIC
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