Application of MM440 Inverter in Variable Pump Testing System

For the realization of test automation of variable pump testing system,and in order to control inverter more conveniently,and display inverter's real-time parameters directly and friendly,this research usesd C# as developing language and MSComm to communicate with Siemens MM440(MicroMaster440) inverter through serial port.The USS(Universal Serial Interface Protocol) communication protocol and serial communication program based on C# were discussed.