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INM 725B Rev 21
13 .4 Protocols
13 .4 .1 MODBUS
The tables below show the standard message formats for data interchange, for both ASCII
(standard comm’s version Only) and RTU protocols.
ASCII tables
Each character represents 7 bit binary data in ASCII format with the exception
of the characters in brackets, which should be considered as one character.
X represents a character with more than one possible value.
All characters are framed with 1 start bit, 1 parity bit and 1 stop bit.
RTU tables .
Each character represents 8 bit binary data in hexadecimal format.
Y represents a character with more than one possible value.
All characters are framed with 1 start bit, 1 parity bit and 1 stop bit.
Read Request – Master
ASCII
START
ADDRESS
FUNCTION
REGISTER
ADDRESS
NO OF
REGISTERS
ERROR
CHECK
STOP
:
XX
XX
XXXX
XXXX
XX
[LF] [CR]
RTU
START
ADDRESS
FUNCTION
REGISTER
ADDRESS
NO OF
REGISTERS
ERROR
CHECK
STOP
ELAPSED TIME
3 ½
CHARACTERS
MIN
Y
Y
YY
YY
YY
ELAPSED TIME
3 ½
CHARACTERS
MIN
Read Request – Slave
ASCII
START
ADDRESS
FUNCTION
BYTE
COUNT
DATA
ERROR
CHECK
STOP
:
XX
XX
XX
XX
XX
[LF] [CR]
RTU
START
ADDRESS
FUNCTION
BYTE
COUNT
DATA
ERROR
CHECK
STOP
ELAPSED TIME
3 ½
CHARACTERS
MIN
Y
Y
Y
YY
YY
ELAPSED TIME
3 ½
CHARACTERS
MIN
Single Write Request/Response
Master write request and slave write response, are the same.
ASCII
START
ADDRESS
FUNCTION
REGISTER
ADDRESS
DATA
ERROR
CHECK
STOP
:
XX
XX
XXXX
XXXX
XX
[LF] [CR]
RTU
START
ADDRESS
FUNCTION
REGISTER
ADDRESS
DATA
ERROR
CHECK
STOP
ELAPSED TIME
3 ½
CHARACTERS
MIN
Y
Y
YY
YY
YY
ELAPSED TIME
3 ½
CHARACTERS
MIN