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。
The function of serial communication port in protocol tester was analyzed and a programmable multi-protocol serial communication interface circuit was designed.
测试仪设计有隔离的RS485标准串行口，通讯协议兼容研华ADAM4000系列，能够直接接入RS485总线网络。
The meter is designed with isolated RS485 series interface and standard communication protocal compatible with ADAM4000 and can be connected to control network directly.
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