(4) Error check area
It determines if frame is normal or not by using CRC check of 2 byte.
(5) Modbus address regulation
Address in the data starts from 0 and it is same with value that is minus 1 from modbus memory, Modbus
address 2 is same with address 1 of data.
9.3.3 Data and expression of address
To express data and address of modbus protocol, the characteristic is as follows.
(1) It used hexadecimal as basic form.
(2) In the ASCII mode, Hex data is converted into ASCII code.
(3) RTU mode uses Hex data.
(4) Each function code has following meaning.
Code(Hex) Purpose Used area address Max. response data
01
To Next Page
Loading...
Need help?
General
