Chapter 4 Parameters
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VFD-L-I Series
4-52
Revision July 2009, SW V1.1
ASCII mode:
STX
Start character ‘:’ (3AH)
ADR 1
ADR 0
Communication address:
8-bit address consists of 2 ASCII codes
CMD1
CMD0
Command code:
8-bit command consists of 2 ASCII codes
DATA (n-1)
…….
DATA 0
Contents of data:
n x 8-bit data consist of 2n ASCII codes.
n <= 25
，
maximum of 50 ASCII codes
LRC CHK 1
LRC CHK 0
LRC check sum:
8-bit check sum consists of 2 ASCII codes
END1
END0
End characters:
END1= CR (0DH), END0= LF (0AH)
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)
…….
DATA 0
Contents of data:
n x 8-bit data, n<= 25
CRC CHK
Low
CRC CHK
High
CRC check sum:
16-bit check sum consists of 2 8-bit characters
END
A silent interval of more than 10 ms
3.2 ADR (Communication Address)
Valid communication addresses are in the range of 0 to 247. A communication
address equal to 0, means broadcast to all AC drives (AMD). In this case, the AMD
will not reply any message to the master device.
00H: broadcast to all AC drives
01H: AC drive of address 01
0FH: AC drive of address 15
10H: AC drive of address 16
:
FEH: AC drive of address 254
For example, communication to AMD with address 16 decimal (10H):
ASCII mode: Address=’1’,’0’ => ‘1’=31H, ‘0’=30H
RTU mode: Address=10H
3.3 CMD (Command code) and DATA (data characters)
Summary of Contents for VFD-L-I Series
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