Method for self-defining physical interface of serial port by software

Abstract

The invention discloses a method for self-defining a physical interface of a serial port by software. An application program of an upper computer is used for determining the physical interface of the target serial port; the software is used for controlling enable selection of a main logic chip to a plurality of physical interface chips; one interface chip in the interface chips RS232 / RS422 / RS485 is only gated; and in a hardware loop, a plurality of 74-series logic chips are used for constructing a gating combination logic sequence, so that mutual exclusivity among different chips is ensured and the possibility of false gating is avoided. Therefore, the purpose of configuring the physical interface of the serial port is achieved and ports in the same position can be replaced with other physical interfaces. According to the method, terminals with different definitions can be staggered without replacing wiring terminals, and wire-jumping selection can be performed without pulling or inserting a board, so that electrostatic interference caused by hardware replacement can be avoided and field operation of project debugging personnel is convenient; and a connection type of the serial port also can be configured and recorded from a background, so that a communication manager has higher adaptability and reliability on the scene.

Description

technical field [0001] The invention relates to a method for software customizing the physical interface of a serial port, which belongs to the technical field of electric engineering. Background technique [0002] The communication management machine plays a very important role in the substation integrated automation system. It needs to communicate with other devices through the communication protocol and communication medium specified by the designer. Among them, the commonly used serial communication medium is RS232 / RS422 / RS485. Due to different application occasions or different interconnected manufacturers, the commissioning engineer needs to change the communication medium mode of the serial port according to the actual situation on the spot without changing the communication protocol. The number of built-in communication interfaces of the communication management machine is certain, so each communication port is required to be compatible with the physical interface of...

Images