Delta Electronics Network Device VFD-S User Manual page 122

2.2 11-bit character frame (For 8-bit character):
( 8.N.2 )
Start
bit
( 8.E.1 )
Start
bit
( 8.O.1 )
Start
bit
3. Communication Protocol
3.1 Communication Data Frame:
ASCII mode:
STX
ADR 1
ADR 0
CMD1
CMD0
DATA (n-1)
.......
DATA 0
LRC CHK 1
LRC CHK 0
END1
END0
RTU mode:
START
ADR
CMD
DATA (n-1)
.......
DATA 0
CRC CHK
Low
CRC CHK
High
END
Revision August 2008, SE09, SW V2.61
0 1 2 3
8-bit character
11-bit character frame
0 1 2 3
8-bit character
11-bit character frame
0 1 2 3
8-bit character
11-bit character frame
Start character ':' (3AH)
Communication address:
8-bit address consists of 2 ASCII codes
Command code:
8-bit command consists of 2 ASCII codes
Contents of data:
n x 8-bit data consist of 2n ASCII codes.
n <= 25，maximum of 50 ASCII codes
LRC check sum:
8-bit check sum consists of 2 ASCII codes
End characters:
END1= CR (0DH), END0= LF (0AH)
A silent interval of more than 10 ms
Communication address: 8-bit address
Command code: 8-bit command
Contents of data:
n x 8-bit data, n<= 25
CRC check sum:
16-bit check sum consists of 2 8-bit characters
A silent interval of more than 10 ms
Chapter 5 Parameters|VFD-S Series
4 5 6 7
5
4 6 7
4 5 6 7
Stop Stop
bit bit
Even
Stop
parity
bit
Odd
Stop
parity
bit
5-65