6.
DATA COMMUNICATIONS USING
AN
M
:
N
MULTIDROP
UN
n
1
6.2.3
Command
and
message
format
for
data
comrnunhUon8
8mong
computers
A
command and message format for data communications among com-
puters
with
the dedicated protocol must be set.
Use any command except the commands used
with
the dedicated protocol
of an
AJ71 C24.
See Section
3.3.1.
The message format basically follows
the
control procedure set by the mode
setting switch
of
each
AJ71C24.
See Section
8.4.
Set the data arrangement after the
PC
number in
the
message as desired.
(1)
Protocol
1
when doing data communications
Computer
2
1
I
J
3
I
d
-7
4
(2)
Example of a message format (when station numbers
80H
and
81H
i
A
perform data communications)
Computer
2
number 81
H)
(shtion
mi
nurnkr
(1)
If
the mode retting switch of an AJ71
C24
is set for the dedicated protocol mode (1 to
4)
and
if
the station number written in a message to be transmitted from computer
1
is WH to 31H
(designating AJ71
C24),
then the designated station (AJ71
C24)
determines that message to
be a faulty message and
it
transmit8 back a message beginning with NAK
to
computer
1.
Always
use
station numbers 80H to SFH
for
communications between the computers.
(2)
Section 8.3 tells how to read the message format figures.
6-4
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