关键词: Modbus RTU, 多线程, 数据保护

Abstract:

Modbus RTU has extensive application in field bus communication.When PC is working as a master,the real-time communication and the interface response of PC have a conflict because of the master/slave response mode adopted by Modbus.To solve the conflict,the multithreading technology of LabWindows/CVI is applied.Tasks with high real-time demanding are endowed with corresponding priority and arranged into sub-threads.The Modbus communication program of automatic cigarette-wrapping machine is composed by multithreading.The result of the experiment shows that the master has a fast response towards the manipulation through human-computer interaction and achieves the communication between master and slaves without conflict.

Key words: Modbus RTU;multithreading;data protection