西门子变频器MM420/MM430/MM440通过485总线进行的计算机控制程序，采用VB6.0编写.已经调试过。-Siemens inverter MM420/MM430/MM440 485 bus through the computer control procedures, using VB 6.0. Debugging has been off.

变频器带载测试系统，多工位多功率选择。VB编写，含ACCESS数据库应用，485通讯等-Inverter system with load testing, multi-position multi-power option. Written in VB, with ACCESS database application, 485, etc.