User`s guide

Electrical and Mechanical Interfaces
28
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-21 Models 74401 – 74404 measure 2.54” (6.5cm) H x 4.72” (12cm) L. All
models are equipped with a full-height chassis bracket and a low profile bracket.