通过485的物理介质控制变频器的启动，停止和调速，采用modbus协议完成-Control of the physical media through the inverter 485 to start, stop and speed control, complete with modbus protocol

信捷PLC与变频器进行485通讯，可以采用modbus协议通讯(Xinje PLC and frequency converter are 485 communications, can use Modbus protocol communication)