本教程结合实际开发内容进行实例讲解Linux下串口与工业协议开发，主要内容有串口通信原理、串口编程常用的API、串口编程实践、Modbus协议介绍和Modbus编程实践等内容。-Combined with the actual development of the tutorial examples to explain the contents of the serial port and the industrial agreement under Linux development, th