Delta VFD-L Series

5
VFD-L Series
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
5-43
2.2 11-bit character frame (For 8-bit character):
Start
bit
0
1
2
3
4
5
6
Stop
bit
Stop
bit
8-bit character
11-bit character frame
( 8.N.2:Pr.9-04=3 or 6 )
Start
bit
0
1
2
3
4
5
6
Even
parity
Stop
bit
11-bit character frame
( 8.E.1:Pr.9-04=4 or 7)
Start
bit
0
1
2
3
4
5
6
Stop
bit
11-bit character frame
( 8.O.1:Pr.9-04=5 or 8)
Odd
parity
7
7
7
8-bit character
8-bit character
3.Communication Protocol
3.1 Communication Data Frame:
ASCII mode:
STX
S
tart character ‘:’ (3AH)
ADR 1
ADR 0
C
ommunication address:
8-bit address consists of 2 ASCII codes
CMD 1
CMD 0
C
ommand code:
8-bit command consists of 2 ASCII codes
DATA (n-1)
…….
DATA 0
C
ontents of data:
n
p 8-bit data consist of 2n ASCII codes.
n<=25  maximum of 50 ASCII codes
LRC CHK 1
LRC CHK 0
L
RC check sum:
8-bit check sum consists of 2 ASCII codes
END 1
END 0
E
nd characters:
END1= CR (0DH), END0= LF(0AH)
RTU mode:
START
A
silent interval of more than 10 ms
ADR
C
ommunication address:
8-bit address
CMD
C
ommand code:
8-bit command
DATA (n-1)
…….
DATA 0
C
ontents of data:
n p 8-bit data, n<=25
CRC CHK Low
CRC CHK High
C
RC check sum:
16-bit check sum consists of 2 8-bit characters
END
A
silent interval of more than 10 ms