User`s guide

5-4 Electrical and Mechanical Interfaces
accept 12 to 26AWG (1.2mm to 0.45mm) wire. The terminals are connected as follows
(with terminal 3 being closest to the service LED):
Terminal Connection
3 Shield
2 RS-485 -
1 RS-485 +
!
Use only shielded cabling suitable for an RS-485 channel. The use of
unshielded cabling could result in damage to the adapter due to common
mode voltage associated with differences in ground potential between
different nodes.
Mechanical Considerations
PLCTA-20 models 74401 – 74404 measure 3.87” (9.8cm) H x 5.20” (13.2cm) L. Model
74405 measures 3.69” (9.4cm) H x 7.36” (18.7cm) L. All models are equipped with a
full-height chassis bracket. If a PLM SMX transceiver is used with a Model 74405
adapter, two PCI slots must be dedicated to the adapter due to the wider-width of the
assembled PCLTA-20/PLM adapter.