Delta ASD-A3-0121, User Manual

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MODBUS Communication ASDA-A3
9-8
Revision December, 2017
9
Example 2: function code 06H, writing single word:
The master issues a command to the first slave and writes data 0064H to address 0200H. The
slave sends a response message to the master after writing is completed. The calculation of
LRC and CRC is described below.
ASCII mode:
Command Message (Master):
Response Message (Slave):
Start ‘ : ’ Start ‘ : ’
Slave Address
‘0’
Slave Address
‘0’
‘1’ ‘1’
Function
‘0’
Function
‘0’
‘6’ ‘6’
Start Data Address
‘0’
Start Data Address
‘0’
‘2’ ‘2'
‘0’ ‘0’
‘0’ ‘0’
Data Content
‘0’
Data Content
‘0’
‘0’ ‘0’
‘6’ ‘6’
‘4’ ‘4’
LRC Check
‘9’
LRC Check
‘9’
‘3’ ‘3’
End 1 (0DH) (CR) End 1 (0DH) (CR)
End 0 (0AH) (LF) End 0 (0AH) (LF)
RTU mode:
Command Message (Master):
Response Message (Slave):
Address 01H Address 01H
Slave Function 06H Slave Function 06H
Start Data Address
02H (High)
Start Data Address
02H (High)
00H (Low) 00H (Low)
Data Content
00H (High)
Data Content
00H (High)
64H (Low) 64H (Low)
CRC Check Low 89H (Low) CRC Check Low 89H (Low)
CRC Check High 99H (High) CRC Check High 99H (High)
Note: A silent interval of 10 ms is required before and after each transmission in RTU mode.