Serial communication control of frequency conversion speed control for motor

The serial port communication system is introduced, in which frequency conversion is used to control electrical motor on the tractor-trailer lateral stability experimental platform. The method of MSCOMM of VB active X and the communication protocol of VFD-M transducer are explained. The serial communication program between industrial control machine and frequency transducer is given based on VB 6.0. It presents the parameter transfer between industrial control machine and frequency transducer and real-time supervising, at the same time, the serial port communication system can simulate the various driving states of tractor-trailer combination in various speed.