Mitsubishi Electric QJ71C24N User Manual page 110

4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
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(2) Connection examples
(a) Connection example with an external device capable of turning on and off
the CD(DCD) signal (No. 1 pin)
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 may be
performed.
(b) Connection example with an external device not capable of turning on and
off the CD(DCD) signal (No. 1 pin)
1) Connection example 1
When wiring shown above, DTR/DSR control or DC code control may be performed.
2) Connection example 2
When wiring shown above, DC code control may be performed.
POINT
If the programmable controller CPU and an external device cannot be communicated,
try to perform data communication as a connection test, using the wiring connection as
shown 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.
MELSEC-Q
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