APPENDICES
MELSEC-A
compked code
I
(ODH,
OAH)
Settina
tho
I
-
recoive-completion
data length
Fixed
at
127
words
IData
receive
bv
(254 byter)
unit sating Fixed at 'wordr'.
Setting
the
send
buffer memory
Fixed as
below:
Head address OH
Buffer memory
sire
80H
Setting receive
buffer memory
Fixed as below:
Head address 80H
Buffer memory
sire
80H
Rocoive data clou
request
Data
communications
control with a
computer
(RS-232C or
-422)
AJ71
C24
Sottina the receive
Fixod at CR. LF
-
-
-
NO-
Protocol
-
-
Bidirec-
tional
Mode switching
oR8232C interface
Tranrmission is
controlled by the
DTWDSR control.
Control
is
not available.
Transmission control
ORS-422 interface
Data communications control in
the half-duplex transmission
(RS-232C)
'm
:
n' multidrop link
To clear the received
data after an error
occurs, the CPU must be
the data received using
rosot This means that
the dedicated protocol is
also cleared at the same
time.
AJ71
C24-S8
~
Setting
k
po66iblO
a6
roquirod.
(Default
:
CR, LF [ODH, OAH])
Setting is porsibie
as
required.
(D~fault
:
127
WOrd6)
Setting
ir
possibio
as
roquired
rwords' or 'bytor').
(bf8Uit
:
Words)
Setting
ir
posrible
a6
required
excluding the memory area of 100H
to
11
FH.
[
Default
'
Buffor memory size 80H
]
Head address OH
Setting is possible
as
required
excluding the memory area
of
1 OOH to
11 FH.
[
:
Buffer momory eizo 80H
Head address
The data received in the no-protocol
mode can only
b.
cloared (without
the dedicated protocol) by using a
influencing the communications using
sequence program.
Data communicationr with a computer
in the bidirectional mode
ir
posrible.
configurdion)
(POS6iblO in 140-1 ba- Sy6tOm
The modos used wtth tho -422 and
after the AJ71
C2CsLI
is
started up.
RS-232C interface6
CUI
bo rwitched
Dsdicatedpfotocol
Nc-protocol
-
Bid1r-d
oRS-232C interfaco
Transmiasion control by the DTWOSR
control
or
the
DC
code control is
enabled.
Tranrmission control by the DC code
control is enabled.
oRS-422 interface
Data communications with an external
device supporting the half-duplex
transmission function can be
controlled according
to
the setting by
the user.
Data communications in the multidrop
link in which the ratio
of
computers to
PC CPUs is
'rn
:
n' is posoibk.
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
9.5
7.5
10
3.4
7.6.2
3.5
7.7
5
6
.
I
b
L.
/1
r
c
L
L
h
APP-3
t
L
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