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A. C o m m u n i c a t i o n s
A - 1 5
Field Name
ASCII
Slave Address
01
Command code
01
Bytes Count
05
Data (Coils T27…T20)
CD
Data (Coils T35…T38)
6B
Data (Coils T43…T36)
B2
Data (Coils T51…T44)
0E
Data (Coils T56…T52)
1B
Error Check (LRC)
E6
END 1
0D (Hex)
END 0
0A (Hex)
Command Code
:
02, Read Input Status
Example: Read status of contact Y024~Y070 from Slave ID#01
Master
→
ELC “: 01 02 05 14 00 25 BF CR LF”
Sent message:
Field Name
ASCII
STX 3A
(Hex)
Slave Address
01
Command code
02
Starting Address Hi
05
Starting Address Lo
14
Number of Points Hi
00
Number of Points Lo
25
Error Check (LRC)
BF
END 1
0D (Hex)
END 0
0A (Hex)
Assume Number of Points in sent message is
n
(Dec), quotient of
n
/8 is
M
and the remainder is
N.
When
N
= 0, Bytes Count in feedback message will be
M
; when N
≠
0, Bytes Count will be
M+1
.
ELC
→
Master “: 01 01 05 CD 6B B2 0E 1B E5 CR LF”
Feedback message:
Field Name
ASCII
STX 3A
(Hex)
Slave Address
01
Command code
02
Bytes Count
05
Data (Coils Y033…Y024)
CD
Содержание ELC-PB
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