User`s manual

8
(3) Connection precaution
(a) Treat the FG signal and shield of the connection cable as indicated
below:
Connection method Remark
FG signal
Connect to the connector
enclosure of the module.
Shield
Connect to the FG terminal of
the external device or
connector enclosure of the
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.
(b) If data communication cannot be performed normally due to external
noise, install wiring as follows:
•
Connect the FG terminal of the external device and the connector
enclosure of the module using the connector cable shield.
•
Use a twisted pair style between each signal (except SG) and SG
signal.
FG
RD
SD
DTR
DSR
SG
RD
SD
DTR
DSR
SG
Connector
enclosure
Module
Shield
(External device)