Delta ASDA-B3 Series, User Manual

Page: 484 / 815

ASDA-B3 MODBUS Communication
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Example 2: function code 06H, write single word
When the master issues a write command to the first slave:
The slave writes data 0064H to the start data address 0200H and sends a response message
to the master after writing is complete.
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
‘9’
LRC
‘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.