7.
INITIAL SETTING
OF
TRANSMISSION CONTROL DATA
TO
..
BUFFERMEMORV~
-
MELSEC-A
7.2.2
Setting
of
tmnsmlwkn
to
the
AJ7lC24
with
the
haMuplex
tranmiwion
The following shows how to set the
AJ71 C24
to discontinue transmission when
the
AJ71C24
and an external device (using half-duplex transmission) have
begun transmitting data to each other simultaneously.
(1)
Setting "half-duplex transmission", "non-priority", and "not resend":
Procedure]
I
(1)
Transmission method
lOFH
7-
(Default:
0)
bl bO
write
1.
[
0:
Fulcdupkx transmission
1:
Mdupbx
transmission
r
POINT
oset bits
bl
to
b15
of
address
1
OFH
to either
0
or
1.
(The
AJ71 C24
will
ignore
the
settings.)
(2)
Priority setting when tra'nsmission has begun simultaneously
llOH
to bO
(Default:
0)
Wh
1
tom.
1
Thisdatasrtsthesendwaittimewhendata
transmission is
started
01
restartd.
(Unit
100
msec)
(3)
Transmission method when data transmission
is
restarted
bl5
IO
bl
b0
(POINTI
I
Set bits bl
to
b15
of address
11
1
H
either to
0
or
1.
(The
AJ71C24
will
ignore the settings.)
I
I
ExamDle
I
The
CD
terminal check is set to "Enabled". Half-duplex transmission is used and the
non-priority of transmission and "not resend" are set. (Send wait time:
300
msec)
(AJ71 C24
I/O
addresses:
80
to
9F)
I
(Sequence Program)
Write
'1'
to buffer memory address
1OFH.
Write
'3'
to buffer memory address
110H.
Leave the setting
of
buffer memory
addresses
10BH
and
11 1H
for defaults.
4
7
:-7
'._
'-
f
1
I
7-5
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