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5.
HALF-DUPLEX COMMUNICATIONS USING THE RS-232C INTERFACE
MELSEC-A
5.4
ONIOFF Timing of the CD and RS Signals of the AJ71C24
When doing half-duplex communications, the data transmission timing is
shown by using the CD and RS signals of the AJ71C24.
(
In half-duplex communications, an external device controls the CD signal of
the AJ71 C24.
The AJ71C24 system controls the RS signal of the AJ71C24.
The table below shows the half-duplex communications connections dis-
cussed in this section.
Example of Connections
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