Delta MS300 Series User Manual page 794

RTU mode:
Command Message
Address
Function
Starting data register
Number of register
(count by word)
CRC Check Low
CRC Check High
06H: single write, write single data to a register.
4.
Example: Writing data 6000 (1770H) to register 0100H. AMD address is 01H.
ASCII mode:
Command Message
STX
Address
Function
Target register
Register content
LRC Check
END
RTU mode:
Command Message
Address
Function
Target register
Register content
CRC Check Low
CRC Check High
01H
03H
21H Number of register
02H (count by byte)
00H Content of register
address 2102H
02H
6FH Content of register
F7H address 2103H
CRC Check Low
CRC Check High
':'
'0'
'1'
'0'
'6'
'0'
'1'
Target register
'0'
'0'
'1'
'7'
Register content
'7'
'0'
'7'
LRC Check
'1'
CR
LF
01H
06H
01H
Target register
00H
17H
Register content
70H
86H
CRC Check Low
CRC Check High
22H
785
Appendix A. Modbus ProtocolMS300
Response Message
Address
Function
Response Message
STX
Address
Function
END
Response Message
Address
Function
01H
03H
04H
17H
70H
00H
00H
FEH
5CH
':'
'0'
'1'
'0'
'6'
'0'
'1'
'0'
'0'
'1'
'7'
'7'
'0'
'7'
'1'
CR
LF
01H
06H
01H
00H
17H
70H
86H
22H