4.
SETTINGS AND
RROCED~S.~B~IORERATION
,.
.
MELSEGA
(1) Main channel
The main channel in the above table refers to the interface to which the
computer is connected. The main channel setting is valid oniyfor modes
A
to D.
In other modes, the setting switch may be in the
ON
or
OFF
position.
(Section 4.5.4 gives the setting examples for different system configura-
tions.)
Setting the main channel defines data flow as shown below:
Data received through the main channel is automatically transmitted
through the sub channel.
Data received through the sub channel is automatically transmitted
through the main channel.
When the mode switch is set to
"AI
to
"D",
only the processing request
commands, transmitted from other stations and received through the
main channel of the self, are valid with the set mode.
The
AJ71
C24 executes the requested processing and transmits the result
through the main channel.
flow
PCCPU
AnlC24
Rs23x
is
set
to
the
main
channel
(2) Transmission specifications
The RS-232C and RS-422 use the same transmission specifications.
They cannot operate with
two
different transmission specifications set-
tings.
Do not set the "unusable" baud rate setting (SW13, 14, and 15
ON).
If these switches are set, the
RUN
indicator LED (LED
No.
0)
is
turned
OFF
and operation is not possible.
(3) Sum check
Set whether the sum check code is added
or
not added
to
the end of the
message, when the computer link operates with the dedicated protocol.
Sections 8.4.1 to 8.4.4 and 8.4.5
(7)
give the message structure and sum
check code when the sum check setting is "Enabled".
4-7
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