4.
SETTINGS AND PROCEDURES BEFORE OPERATION
MELSEGA
'OINTS
I
Key points when setting modes.
(1)
The
RS-232C
and
RS-422
transmission specification protocols are iden-
tical. (See Section
4.3.2).
(2)
To
use the
RS-232C
and the
RS-422
with a single mode, set the mode
(3)
If there is any interface which is not connected to any external device
when the mode setting is at
"9"
to
"Dl',
noise will come in through such
an interface and normal communications cannot be done. In such
a
case, change the mode setting to
"1'
to
"8".
(4)
When the computers and the
AJ71 C24
modules are connected in an
m:n
multidrop link with the dedicated protocol, do not use protocol
3
0(7",
(5)
Sections
2.3.1
to
2.3.6
and
4.5.4
give the examples
of
settings with
switch to
"1
'I
to
"8".
"C").
different system configurations.
4.3.2
Setting
of
transmission
specifications,
main
channels,
and
terminal
resistance
Position
of
Setting Switch
ON
OFF
Notes
RS422
I
*
RS232C
Valid for
modes
1
AtoD
Mt
0
z:M
1
SW17
I
Paritysetting
Even
Odd
when pahty
check
'enabled' is
selected
SW18
Disabled
Enabled
Sum
check
SW21
1
bit
2 bits
Stop bit
A
-
-
sw22
E:&
RUN
t
Enabled
-
Disabled
Send
area
resistance
Receive
is
used
~~24
tae'%nal
1
Valid
only
SW23
when RS-422
Absent
Present
terminal
Present
Absent
resistance
1
-"
i
Y
CI
d
3
J
ii
PI
Y
Y
4-6
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