多台异步电动机运行时，上位机与控制器之间的通信比较复杂。
When many induction motors are operating, the communication between computer and controllers is very difficult.
主要介绍电气设备中可编程逻辑控制器(plc)、变频器、触摸屏、RS - 485模块及个人电脑之间实现异步通信的软切换。
The soft switching of asynchronous communication among PLC (Programmable Logic Con-troller), transducer, touch screen, RS-485 module and PC is introduced.
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