r
c,
L-
C
P
C
c
8.
COMMUNICATIONS USING
DEDICATED
.,_,
-,
PROTOCOLS
MELSEC-A
(7)
Sum check code
The sum check code is 2-digit
ASCII
representing the lower
1
byte
(8
bits)
of
the sum derived from the
BIN
code representing the checked
data.
With
DIP
switch SW21
OFF,
the sum check code is not added.
Example: If
A,B,C,
and
D
are transferred
in
format
1,
setting station
number
0,
PC CPU
number FF, command
BR
(batch read
of
device memory), and message wait time to
30
msec, the sum
check code value is as shown below
An1
c24
~
30H
+
30H
+
46H
+
46H
+
42H
+
52H
+
33H
+
1
41H
+
42H
+
43H
+
44H
=
2BDH
7
I
I
I
I
St
No.
:
Station
number
(8)
Error code
0
Indicates an error following a
NAK
transmission.
0Error codes are transmitted as 2-digit
ASCII
(hexadecimal) in the
0If
two
or more errors occur simultaneously, the error code
of
the
0
For error code details, see Section 11
.l.
range of OOH to FFH.
lowest number
is
transmitted.
8-
15
.
..
.._
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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