简单来说，Modbus调试软件就是串口助手，或网络调试助手，只不过增加了协议分析，CRC计算报文帧拼接的功能。 上一篇文章介绍了Modbus协议，物理层和协议层，主要包括3种模式：Modbus-RTU、Modbus-ASCII和Modbus-TCP。前两种是基于串口的，后一种是基于TCP网口的。

“Not being overcomplicated is Modbus TCP/IP’s biggest draw, not only for PLCs, but especially for PC-based applications,” said Jason Haldeman, senior product specialist for I/O and networking at ...