Modbus RTU output

Can any one please help me by giving me the information about what is the difference between Modbus ASCII and Modbus RTU? tell me what is the procedure of the Modbus RTU Digital to Analog Output (DAC) Modules? Give me the some of the information about it so that I can get knowledge about it?

Hii sir, I Wants to get the Information About the Modbus RTU Protocol Will you Please Provide It ?

[pooja]

Modbus RTU is an open, serial (RS-232 or RS-485) protocol derived from the Master/Slave architecture. It is a widely accepted protocol due to its ease of use and reliability. Modbus RTU is widely used within Building Management Systems (BMS) and Industrial Automation Systems (IAS).

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MODBUS is considered an application layer messaging protocol, providing Master/Slave communication between devices connected together through buses or networks.

On the OSI model, MODBUS is positioned at level 7. MODBUS is intended to be a request/reply protocol and delivers services specified by function codes.

The function codes of MODBUS are elements of MODBUS request/reply PDUs (Protocol Data Unit).


MODBUS RTU Memory Map

Modbus RTU Data Type Common name Starting address
Modbus Coils Bits, binary values, flags 00001
Digital Inputs Binary inputs 10001
Analog Inputs Binary inputs 30001
Modbus Registers Analog values, variables 40001