Character
ASCII code
RTU mode:
Each 8-bit data is the combination of two 4-bit hexadecimal characters. For example, 64
Hex.
2. Data Format
10-bit character frame (For ASCII):
( 7.N.2)
Start
( 7.E.1)
Start
( 7.O.1)
11-bit character frame (For RTU):
( 8.N.2 )
Start
( 8.E.1 )
Start
( 8.O.1 )
Start
3. Communication Protocol
3.1 Communication Data Frame:
ASCII mode:
Revision August 2008, 03VE, SW V2.04
'8'
'9'
38H
39H
0
1
2
bit
7-bit character
10-bit character frame
0
1
2
bit
7-bit character
10-bit character frame
Start
0
1
2
bit
7-bit character
10-bit character frame
0
1
2
bit
8-bit character
11-bit character frame
0
1
2
bit
8-bit character
11-bit character frame
0
1
2
bit
8-bit character
11-bit character frame
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
'A'
'B'
41H
42H
3
4
5
3
4
5
3
4
5
3
4
5
6
3
4
5
6
5
3
4
6
Chapter 4 Parameters|
'C'
'D'
'E'
43H
44H
45H
Stop
Stop
6
bit
bit
Even
Stop
6
parity
bit
Odd
Stop
6
parity
bit
Stop
Stop
7
bit
bit
Even
Stop
7
parity
bit
Odd
Stop
7
parity
bit
'F'
46H
4-139