Serial port communication system based on LabVIEW passive receiving type

Abstract

The invention provides a serial port communication system based on the LabVIEW passive receiving type. The serial port communication system comprises an external communication module, a trigger module, a serial port base communication module, a data detecting and re-detecting module and a data storage module. The external communication module and an external controller achieve communication through two shared variables, the trigger module carries out judgment according to a trigger shared variable data valve sent in by the external communication module, and the serial port base communication module comprises an initialization module, a data transmission and processing module and a data receiving module. The data detecting and re-detecting module judges whether the data type and the length of received data are the same as the data type and the length set by a testing instrument, and the data storage module stores the data which is qualified by judging of the data detecting and re-detecting module. According to the system, only corresponding serial port parameters need to be set for displaying data collected by hardware, the collected data can be stored and replayed in real time, and research on the collected data in the future can be convenient. Tests show that the stability and the reliability of the system are high.

Description

technical field [0001] The invention belongs to the field of serial communication, in particular to a passive receiving serial communication system based on LabVIEW. Background technique [0002] Serial communication is the simplest and most common way of data communication between computer and external equipment and between computer and test system. The serial communication uses the built-in serial port of the computer, and the user does not need to purchase any special hardware, as long as a serial port line can achieve the purpose of sending or receiving data without losing the accuracy of the test. The serial port forms a virtual instrument system with a PC computer through the RS-232 serial port bus, which is mainly suitable for low-speed test systems. It has the characteristics of simple interface and convenient use. Therefore, serial port communication is widely used in data acquisition, monitoring and instrument control and other occasions. The emergence of the gra...

AI Technical Summary

Problems solved by technology

Question 1: The general passive receiving serial communication system reads data by continuously querying the buffer with a loop structure, but sometimes the serial data is incomplete or empty. read, resulting in an incomplete data

Question 2: When using LabVIEW to read data from the serial port, it will continuously query the serial port buffer until the data is received, which increases the processor and resource usage. If there are many other loop structures in the program, it will It will cause other loops in the system to not run smoothly, making the system run slowly

Question 3: Due to the instability of the serial port itself, it is easy to be disturbed by external electromagnetic fields and other external interference, which may cause the data sent by the lower computer to have problems such as inconsistent data types and incomplete data.

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