Bedford B550-2002 - Page 71

5
Revision April 2008, ME13, SW V3.04
5-45
RTU mode:
Command message: Response message:
ADR 01H ADR 01H
CMD 03H CMD 03H
21H Starting data
address
02H
Number of data
(count by byte)
04H
00H 17H Number of data
(count by word)
02H
Content of data
address 2102H
70H
CRC CHK Low 6FH 00H
CRC CHK High F7H
Content of data
address 2103H
00H
CRC CHK Low FEH
CRC CHK High 5CH
Command code: 06H, write 1 word
For example, writing 6000(1770H) to address 0100H of AMD with address 01H.
ASCII mode:
Command message: Response message:
STX ‘:’ STX ‘:’
ADR 1 ‘0’ ADR 1 ‘0’
ADR 0 ‘1’ ADR 0 ‘1’
CMD 1 ‘0’ CMD 1 ‘0’
CMD 0 ‘6’ CMD 0 ‘6’
‘0’ ‘0’
‘1’ ‘1’
‘0’ ‘0’
Data address
‘0’
Data address
‘0’
‘1’ ‘1’
‘7’ ‘7’
‘7’ ‘7’
Data content
‘0’
Data content
‘0’
LRC CHK 1 ‘7’ LRC CHK 1 ‘7’
LRC CHK 0 ‘1’ LRC CHK 0 ‘1’
END 1 CR END 1 CR
END 0 LF END 0 LF
RTU mode:
Command message: Response message:
ADR
01H
ADR 01H
CMD
06H
CMD 06H
01H 01H
Data address
00H
Data address
00H
17H 17H
Data content
70H
Data content
70H
CRC CHK Low 86H CRC CHK Low 86H
CRC CHK High
22H
CRC CHK High 22H
B550 Series sensorless vector frequency drive