标准的modbus常用工业通讯协议文本，内容详尽。为需要的朋友可下载参考。-Modbus common industry standard communication protocol text, and detailed. A friend in need can be downloaded as a reference.

sata 协议文本说明；详述过程等；有利于更好开发设计-SATA protocol text descr iption；

对了解DeviceNet协议非常有帮助，是一个非常不错的协议文本资料。(To understand DeviceNet protocol is very helpful, is a very good agreement text information.)