Savch S200 Series, Руководство пользователя

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Communication protocol MODBUS ASCII (American Standard Code for Information Interchange) mode:each
byte is made up by two ASCII characters. For example:the value is 64 hex and ASCII expression of "64", it’s
constituted of the "6" (36 hex)
、 "4" (34 hex) .
1.Code Meaning of Modes:
Communication protocols belonging to 16 carry system, message ASCII character meaning:"0"... "9", "A"... "F"
every 16 carry on behalf of each message ASCII characters. Such as:
character
‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’
ASCII code 30H 31H 32H 33H 34H 35H 36H 37H
character
‘8’ ‘9’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘F’
ASCII code 38H 39H 41H 42H 43H 44H 45H 46H
2.Structure of characters:
2.1 10-bit character frame (For ASCII)
Data format 7.N.2
Start
bit
0 1 2 3 4 5 6 Stop bit Stop bit
7-data bits
10-bits character farme
Data format 7.E.1
Start
bit
0 1 2 3 4 5 6
Even
parity
Stop bit
7-data bits
10-bits character farme
Data format 7.O.1
Start
bit
0 1 2 3 4 5 6
Odd
parity
Stop bit
7-data bits
10-bits character farme
2.2 11-bit character frame (For RTU)
Data format 8.N.2
Start
bit
0 1 2 3 4 5 6 7
Stop
bit
Stop
bit
8-data bits
11-bits character farme
Data format 8.E.1
Start
bit
0 1 2 3 4 5 6 7
Even
parity
Stop
bit
8-data bits
11-bits character farme