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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 AlSJ71C24
When doing half-duplex communications, the data transmission timing is
shown by using the CD and US signals of the AlSJ71C24.
In half-duplex communications, an external device controls the CD signal of
the A1 SJ71 C24.
The AlSJ71C24 system controls the US signal of the AlSJ71C24.
The table below shows the half-duplex communications connections dis-
cussed in this section.
....--..-
n s and
l Directions
Sional
Signal
controlled
Example of Connections
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