USS Protocol for Danfoss VFD.

自己写的，专门用来连接工业调速系统的USS协议，简单使用，并且已经用在公司的工控产品中-Wrote it myself, specifically designed to connect industrial speed control system of the USS protocol, simple to use, and have been used in the company' s industrial control products,

200与多台变频器通信,协议通信为modbus 的ASCII 方式，200作主站，变频器做从站。(s7-200 communicate with many Inverters)

西门子200 smart 和西门子G120XA之间USS多参数读写轮循程序(USS multi parameter read write round robin program between Siemens 200 smart and Siemens g120xa)