基于RS485总线的51单片机主从通信方式的设计与实现 -51 based on the RS485 bus single-chip master-slave communication Design and Implementation

This document describes the MODBUS over Serial Line protocol. MODBUS Serial Line protocol is a Master-Slave protocol. This protocol takes place at level 2 of the OSI model. A master-slave type system has one node (the master node) that issues exp