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Chapter 4 Parameters|
Revision August 2008, 2ELE, V1.02 4-87
For RTU:
Start
bit
0123456
Stop
bit
Stop
bit
8-bit character
11-bit character frame
( 8.N.2 )
Start
bit
01234
5
6
Even
p
arity
Stop
bit
11-bit character frame
( 8.E.1 )
Start
bit
01234
5
6
Stop
bit
11-bit character frame
( 8.O.1 )
Odd
parity
7
7
7
8-bit character
8-bit character
Start
bit
0123456
Stop
bit
8-bit character
10-bit character frame
( 8.N.1 )
Start
bit
0123456
Even
p
arity
Stop
bit
12-bit character frame
( 8.E.2 )
Start
bit
01234
5
6
Stop
bit
12-bit character frame
( 8.O.2 )
Odd
parity
7
7
7
8-bit character
8-bit character
Stop
bit
Stop
bit
3. Communication Protocol
3.1 Communication Data Frame:
ASCII mode:
STX Start character ‘:’ (3AH)
Address Hi
Address Lo
Communication address:
8-bit address consists of 2 ASCII codes
Function Hi
Function Lo
Command code:
8-bit command consists of 2 ASCII codes
DATA (n-1)
to
DATA 0
Contents of data:
Nx8-bit data consist of 2n ASCII codes
n<=20, maximum of 40 ASCII codes