前半部分是modbus通信协议介绍，后半部分是c51单片机上modbus通信协议的实现代码。-First half of the modbus communication protocol introduced, the latter half is c51 microcontroller modbus communication protocol implementations.

基于modbus协议的触摸屏与单片机通讯的实现-Modbus protocol-based touch-screen realization of communication with the MCU