这是用MCS51编的Modbus传输的CRC校验源程序，以通过实战的校验，简短！-This is MCS51 series Modbus transmission CRC checksum source in order to realize the check, the short!

short to modbus server

RS232，RS485是一个物理接口，简单的说是硬件。也可以说是一种通信接口。MODBUS是一种国际标准的通讯协议，用于不同厂商之间的设备交换数据（一般是工业用途）；所谓协议，也可以理解为有人说的“语言”吧，简单的说是软件(RS232, RS485 is a physical interface, in short, hardware. It can also be said to be a communication interface. MODBUS is an international