Modbus协议规范英文原版

MODBUS is an application layer messaging protocol, positioned at level 7 of the OSI model,which provides client/server communication between devices connected on different types of buses or networks. The industry’s serial de facto standard since 1979, MODBUS continues to enable millions of automatio
Every type of devices(PLC, HMI, Control Panel, Driver, Motion control, I/O Device.)can use MODBUS uses a 'big Endian representation fo It's obvious that all the data handled via ModBus(bits, registers) y