Mitsubishi MELSEC LJ71C24, User Manual

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6 SETTING AND WIRING
(2) Connection examples
(a) Connection example with an external device capable of turning on and off the
CD(DCD) signal (Pin No. 1)
The CD terminal check setting is set according to the specification of the external
device. When wiring shown above, DTR/DSR control or DC code control are
available.
(b) Connection example with an external device not capable of turning on and off
the CD(DCD) signal (Pin No. 1)
1) Connection example 1
When wiring shown above, DTR/DSR control or DC code control are available.
2) Connection example 2
When wiring shown above, DC code control are available.
POINT
If the CPU module and an external device cannot be communicated, try to perform
data communication as a connection test, using the wiring connection in
Connection example 2.
If data can be communicated using the wiring connection shown in Connection
example 2, rewire after checking the interface specifications on the external device
side.