P
h
c
P-
i
r
8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MEBECIA
8.1
4.3
Ondnund
fundion
deuignath
>e8lanatlon
Method
I
Designation in protocol 1 is shown below.
Computer
AJ71
C24
AJ71
C24
add8 these fields
of
data
L
L
I
I I
skuon.
PC
Numb
NumW
x
boddm
E
Sum
x
sod.
HlL
HlL
HlL
Xn3
OFF
The following
is
written to
A171
C24
buffer memory:
10AH
...
Data length
-
109H
...
Head addreaa of transmission data storage area
'OINTSJ
(1) Buffer memory area 100H to 11 FH is the special applications area.
Do
not use this area to store the data to be transmitted with
the on-demand function.
(2) Data length setting range must meet the following criteria:
0
When the buffer memory area
of
OH
to FFH is used:
(Head address)
+
[(data length)
-
11
I
FFH
0
When the buffer memory area of 120H to 7FFH is used:
(Head address)
+
[(data length)
-
11
I
7FFH
(3)
The AJ71
C24
appends 'FE" as the PC
CPU
number.
(4)
The block number is
'OOH"
when protocol
2
is used.
IMPORTANTI
The on-demand function may be used only when the system configura-
tion is a
1
:1
ratio of computers
to
PC CPUs.
If
the on-demand function is used
in
a multidrop link system of
1
:n, 2:n,
or m:n ratios, communications data in control protocols 1 to
4
and
on-demand transmission data will be destroyed and correct data trans-
mission is precluded.
P-
L-
n
8-
109
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