The function of serial communication port in protocol tester was analyzed and a programmable multi-protocol serial communication interface circuit was designed.
分析了网络协议测试仪的串行通信接口功能，设计了一种可编程多协议串行接口电路。
USS protocol used for communication between PLC and inverter can compensate for the lack of hardware interface converter and could realize multi-level reversible speed.
利用USS协议实现PLC与变频器之间的通信可以弥补变频器硬件接口的不足，能够实现多级正反转调速。
The article introduces the kinds of multi-function Watt-hour meter used at home, the corresponding interface of communication, and protocol of communication.
介绍了当前国内使用的三相多功能电能表的类别及其对应的通信接口、通信规约；
The article introduces the kinds of multi-function Watt-hour meter used at home, the corresponding interface of communication, and protocol of communication.
介绍了当前国内使用的三相多功能电能表的类别及其对应的通信接口、通信规约；
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