Delta Electronics VFD-EL series - Communication Data Frame

Revision 2016/03, 6ELE, V1.14
4-75
For RTU:
Start
bit
0
1
2
3
4
5
6
Stop
bit
Stop
bit
8-bit characte r
11-bit character frame
( 8.N.2 )
Start
bit
0
1
2
3
4
5
6
Even
parity
Stop
bit
11-bit character frame
( 8.E.1 )
Start
bit
0
1
2
3
4
5
6
Stop
bit
11-bit character frame
( 8.O.1 )
Odd
parity
7
7
7
8-bit characte r
8-bit character
Start
bit
0
1
2
3
4
5
6
Stop
bit
8-bit characte r
10 -bit character frame
( 8.N.1 )
Start
bit
0
1
2
3
4
5
6
Even
parity
Stop
bit
12 -bit character frame
( 8.E.2 )
Start
bit
0
1
2
3
4
5
6
Stop
bit
12 -bit character frame
( 8.O.2 )
Odd
parity
7
7
7
8-bit characte r
8-bit character
Stop
bit
Stop
bit
 3. Communication Protocol
3.1 Communication Data Frame:
ASCII mode:
STX Start character ‘:’ (3AH)
Address Hi Communication address:
8-bit address consists of 2 ASCII codes
Address Lo
Function Hi Command code:
8-bit command consists of 2 ASCII codes
Function Lo
DATA (n-1) to DATA 0 Contents of data:
Nx8-bit data consist of 2n ASCII codes
n<=20, maximum of 40 ASCII codes
LRC CHK Hi LRC check sum:
8-bit check sum consists of 2 ASCII codes
LRC CHK Lo
END Hi End characters:
END1= CR (0DH), END0= LF(0AH)
END Lo