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F
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r
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c
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5.
HALF-DUPLEX COMMUNICATIONS USING THE RS232C INTERFACE
MELSEGA
5.4
ON/OFF
Timing
of
the CD and
RS
Signals
of
the AJ71C24
When doing halfduplex communications, the data transmission timing is
shown by using the CD and
RS
signals of the AJ71C24.
In halfduplex communications, an external device controls the CD signal of
the AJ71C24.
The AJ71 C24 system controls the
RS
signal of the AJ71 C24.
The table below shows the half-duplex communications connections dis-
cussed in this section.
Signal
controlled
-
A171
C24
by
tho
system
c
AI71
M4
CaWo
Connntkns and
Signal
Dlrottlons
Compulor
Signal
Example
of
Connections
5-4
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