CRC 计算，通讯校验必备，尤其是MODBUS通讯

modbus rtu 通讯协议控件,可以在delphi中调用。 -modbus rtu protocol controls, you can call in delphi.

Delphi Modbus 主站控件，使用TCPCLient 用康海串口服务器通讯，下位机接到串口服务器串口上，用Modbus协议通讯。-Delphi Modbus master control, the use of TCPCLient Kang Hai serial server with the Communication, under the crew received a serial port server serial port, and with the Modbus proto