c-
7.
INITIAL
SETTIF
BUFFER
MEMC
F
L-
c
L.
r
-,
b
r
L.
r
L-
P
L.
IG
OF
TRANSMISSION
CONTROL
DATA
TO
1
RY
MELSEC-A
7.5
Settings In
the
Bldlrectlonal Mode
This section describes how to set items
in
the bidirectional mode and gives
examples.
The defaults set with the buffer memory section are for the no-protocol mode.
When the interface mentioned
in
(1)
is
used
in
the no-protocol mode, all
settings mentioned
in
this section are not necessary.
Setting the bidirectional mode (address
1 12H)
When the mode setting switch (see Section
4.3.1)
is set to
'1'
to
'8',
set
the mode for the following interfaces to the bidirectional mode (see
Section
4.3.1).
0
When the mode switch setting is
'1'
to
'4': RS-422
interface
0
When the mode switch setting is
'5'
to
'8':
RS-232C
interface
Setting the time-out check time (address
113H)
Set the time-out check time which specifies the time from the beginning
of data send to a computer connected through the bidirectional mode
interface
until
the reception
of
the response message (see the figure
in
Section
10.5.1).
Validhnvalid setting of data at simultaneous transmission (address
114H)
Set the data transmitted and received by the
AJ71C24
to valid/invalid
when a computer and the
AJ7lC24
begin simultaneously full-duplex
send
in
the bidirectional mode (see Section
10.6).
Setting the check sum enable/disable (address
11
5H)
Set whether the check sum code is added or not added to the message
when transmitted between the
AJ71 C24
and a computer
in
the bidirec-
tional mode. (see Section
10.5.2 (4)).
This setting is unrelated to the check sum setting (for dedicated
protocol) with
SW21
of the
AJ71C24.
L.
P
L
c
POINTJ
Sections
7.4.3
to
7.4.5
give the settings of the following areas used in
the bidirectional mode. (Since the explanations
in
Sections
7.4.3
to
7.4.5
are for the no-protocol mode, change the mode from non-protocol to
bidirectional when referring to these sections.)
0
Bidirectional word/byte setting area:
. . . .
Section
7.4.3
0
Bidirectional send area:
. .
.
. . .
.
. .
.
.
.
Section
7.4.4
0
Bidirectional receive area:
. . .
.
.
.
.
.
. .
.
Section
7.4.5
The mode with the dedicated protocol which is set with the mode setting
switch is always valid for the interface set to the dedicated protocol.
L
7-14
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