文档介绍：通信嫁定以 MODBUS ASCII(American Standard Code for Information Interchange)模式: 每byte是由2彳固ASCII字元鲍合而成。例如：数值是64 Hex, ASCII的表示方式舄'64, 分别由6(36Hex)、’4'(34Hex)名且合而成。
:
通信嫁定屠於16 位制，ASCII的汛息、字元意羲：S.「9, A...F每侗16 it位制代表每侗ASCII 的言H息字元。例如:
字元
，0'
T
2
3
4
5
6
7,
ASCII code
30H
31H
32H
33H
34H
35H
36H
37H
字元
8
9
A
B
C
D
E
，F'
ASCII code
38H
39H
41H
42H
43H
44H
45H
46H
‘0’
2字元结皆——
Address
10-bit字元框(Fo 做融婀，N ,
Number of data
(count by by哪汗
Content of
starting address
2102H
(髦稀矗％fE，
address 210貌汗
bit
LRC Check
'1'
‘7’
'O'
'O'
'O'
7&
T
3
4
5
2
7・data bits
10-bits character frame
r stbp stop
0 bit hit
7 &en stop
parity bit—
END
(资料够7,0,
CR
LF
Tp~
7-data bits
10・bits character frame
Address start
bit-
Function
'O'
Starting address
11 -bit字元框(Fo
'O' 亶 %
T
7-data bits
10・bits character frame
Number of data
(count by word)
LRC Check
r R10J )
o
，o‘
2
，D'
―T~
END
CR
LF
7 &d Sh
parity hit
I
.
L_—一一 — 一厂_—__ ____L■一一
・ 1
t
1
Start
bit <
0 : 1
•
•
•
2
•
•
•
■ 1
3 : 4 : 5
i
« i
i
6 : 7
\ t
Stop : bit :
Stop bit
8-data bits
11 -bits character frame
(资料格式8,E,1)
Start bit
0 \ .
•
•
t
2
3
i
r————————
4
r— —r ； ；'
5 6 ! 7 Eve^\ Stop
parity ； bit
8-data bits
11 -bits character frame
俊料格式8,0,1)
Start bit
•
0 : 1
1
1
•
2
i
3
i
■
4
■ CM OB ■