User`s guide

4-4 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 devices.
Mechanical Considerations
PCLTA-20 Models 74401 – 74404 measure 3.87” (9.8cm) H x 5.20” (13.2cm) L. Model
74405 and the PCLTA-20 Protocol Analyzer Card measure 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 an SMX or protocol analyzer card, two PCI slots must be
dedicated to the card due to the wider-width of the assembled PCLTA-20/PLM card.