Mitsubishi QJ71C24N User Manual page 14

(3) Connection precaution
(a) Connect the FG signal and shield of the connection cable as indicated
below:
Connect to the connector
FG signal
enclosure of the module.
Connect to the FG terminal of
the external device or
Shield
connector enclosure of the
module.
(b) When normal data communication is not obtained due to external
noise, perform the wiring as follows:
Connect the FG terminal on the external device and the connector
•
enclosure of the module using the shield of the connection cable.
Signals other than SG should be connected with SG signals in the
•
twisted pair.
Connector
enclosure
SD
RD
DSR
DTR
SG
Connection method
Module
• Do not short the FG signal and SG signal
of the connector cable.
• When the FG signal and SG signal are
internally connected in the external device,
do not connect the FG signal to the
module.
Shield (External device)
8
Remark
FG
RD
SD
DTR
DSR
SG