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5. HALF-DUPLEX COMMUNICATIONS USING THE RS-232C INTERFACE
MELSEC-A
5.3
Wiring
The following describes the wiring for connecting the external device to the
AJ71 C24.
To do half-duplex communications, the CD signal of the AJ71C24 must be
controlled by the external device.
Connect them according to "Connections to a device which can turn the CD
terminal signal ON" shown in Section 4.5.2.
Section 5.4 describes the ONIOFF timing of the CD signal of the AJ71C24
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