5
VFD-B Series
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5-57
START
A silent interval of more than 10 ms
ADR Communication address: 8-bit address
CMD Command code: 8-bit command
DATA (n-1)
to
DATA 0
Contents of data:
n×8-bit data, n<=16
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 254. 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.
For example, communication to AMD with address 16 decimal:
ASCII mode: (ADR 1, ADR 0)=’1’,’0’ => ‘1’=31H, ‘0’=30H
RTU mode: (ADR)=10H
3.3 CMD (Command code) and DATA (data characters)
The format of data characters depends on the command code. The available
command codes and examples for VFD-B are described as followed:
(1) 03H: multi read, read data from registers.
Example: reading continuous 2 data from register address 2102H, AMD address
is 01H.
ASCII mode:
Command message: Response message:
STX ‘:’ STX ‘:’
‘0’ ‘0’ ADR 1
ADR 0
‘1’
ADR 1
ADR 0
‘1’
‘0’ ‘0’
CMD 1
CMD 0
‘3’
CMD 1
CMD 0
‘3’
‘2’ ‘0’
‘1’
Number of data
(Count by byte)
‘4’
‘0’ ‘1’
Starting data
address
‘2’ ‘7’
‘0’ ‘7’
‘0’
Content of
register
2102H
‘0’
‘0’ ‘0’
Number of data
(count by word)
‘2’ ‘0’
LRC CHK 1 ‘D’
Content of
register 2103H
‘0’
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