Chapter 5: Serial Communications
Page 5–13
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
CommuniCaTion proToCol
ASCII Mode:
STX Start Character: (3AH)
ADR 1
Communication Address: 8-bit address consists of 2 ASCII
codes
ADR 0
CMD 1
CMD 0
DATA (n-1)
Contents of data: n x 8-bit data consists of 2n ASCII codes� n
� 25 maximum of 50 ASCII codes
�������
DATA 0
LRC CHK 1
LRC check sum: 8-bit check sum consists of 2 ASCII codes
LRC CHK 0
END 1
END characters: END 1 = CR (0DH); END 0 = LF (0AH)
END 0
RTU Mode:
START A silent interval of more than 10 ms
ADR Communication Address: 8-bit address
CMD Command Code: 8-bit command
DATA (n-1)
Contents of data: n x 8-bit data, n � 25�������
DATA 0
CRC CHK Low
CRC check sum: 16-bit check sum consists of 2 8-bit
characters
CRC CHK
High
END A silent interval of more than 10 ms
ADR (Communication Address)
Valid communication addresses are in the range of 0 to 254. A communication address equal to 0
means broadcast to all AC drives, in which case the drives will not acknowledge any message from
the master device.
For example, communication to AC drive with address 16 decimal:
•
ASCII mode: (ADR 1, ADR 0)=’1’,’0’ => ‘1’=31H, ‘0’=30H
•
RTU mode: (ADR)=10H
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