Frequency signal generation method based on RS485 serial port and rotating speed system test method

Abstract

The invention discloses a frequency signal generation method based on an RS485 serial port and a rotating speed system test method, and the frequency signal generation method comprises the steps: enabling the DE end and end of an RS485 chip to be connected, and enabling the DE end and end of the RS485 chip to be connected with the first output end of a control module; connecting the DI end of theRS485 chip with the second output end of the control module; and controlling the potential change of the first output end and the second output end by using a preset control program in the control module, so that the output end of the RS485 chip is controlled to output a corresponding frequency signal. The test method of the rotating speed system comprises the following steps: generating a rotating speed analog signal by utilizing an RS485 interface circuit in the rotating speed system; and testing the rotating speed system through the rotating speed analog signal. According to the frequency signal generation method provided by the invention, frequency signals in various forms can be generated; according to the testing method of the rotating speed system, an RS485 circuit in an existing control system can be utilized, an external power source is not needed, and therefore on-site testing work is more convenient.

Description

technical field [0001] The invention relates to the field of system testing, in particular to a method for generating a frequency signal based on an RS485 serial port and a method for testing a rotating speed system, which are used to facilitate on-site debugging of a system to be tested and save debugging costs. Background technique [0002] In the process of development, debugging and on-site service in the field of automatic control, it is very common and effective to use simulation signals to test the functions of embedded control systems (hereinafter referred to as control systems). Among them, the frequency input signal is a common signal of the control system, which is usually used to detect physical parameters such as rotational speed. Commonly used forms of frequency quantity signals are square wave signals and sine wave signals, which usually need to be generated by a waveform generator or a dedicated simulation instrument. However, signal generating equipment suc...

AI Technical Summary

Problems solved by technology

However, signal generating equipment such as waveform generators are usually bulky, expensive, and not easy to carry. In field applications, an external power supply may be required, which causes a lot of inconvenience to field testing.

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