Niagara NPB-2X-485, Install Sheet, Page: 2 / 4

RS-485 Option Card Install Sheet
Updated: January 16, 2012 Part Number 11873 Rev 1.1
Mounting
Mounting
2
Note
RS ‐ 485 bias resistors are different than
“termination resistors”, externally installed at
the two physical ends of a daisychained
RS ‐ 485 trunk, across the “+” and “–”
terminals. Termination resistors are typically
100 or 120 ohm value resistors.
Whenever termination resistors are used, RS ‐ 485
biasing is typically required.
To enable biasing, install two 2 ‐ pin jumper blocks on
that port’s jumper header, as shown in Figure 2 . To
turn off biasing, remove both 2 ‐ pin jumper blocks from
that port’s header ( the factory ‐ shipped state).
Mounting
Warning
Power to the controller must be OFF when
installing or removing option cards, or
damage will occur! Also, you must be very
careful to plug any option card into its
connector properly (pins aligned).
Mount the NPB ‐ 2X ‐ 485 option card in either of the
option card slots of the JACE, as needed. Note the
T ‐ 202/602 ‐ XPR series has only one option card slot.
See “Preparation,” page 1 for details about RS ‐ 485
resistor biasing, available on newer option cards.
See “COM Port Usage,” page 3 for details about JACE
COM port assignments.
Procedure 1 Mounting NPB-2X-485 option card on a JACE.
1.
Remove power
from the JACE—see the previous
Warning . Wait for all LEDs on the unit to be Off.
2.
Remove the JACE cover or covers
(T ‐ 202/602 ‐ XPR). For all but the T ‐ 202/602 ‐ XPR,
press in the four tabs on both ends of the unit, and
lift the cover off.
Note
If accessory modules are plugged into the
JACE, you may need to slide them away from
the unit to get to the cover tabs.
For the T ‐ 202/602 ‐ XPR, first remove the right
cover, then the left cover, retaining the two screws
that secure each cover.
3.
If a T ‐ 200/600 series or Security JACE, remove the
battery and bracket assembly by taking out the
screws holding it in place, setting screws aside for
later. See Figure 3 .
Figure 3 Remove screws and battery assembly.
Note
The tie wrap on the battery pack should have
its lock “knot” on top , as shown in Figure 3 .

If not, cut and remove the tie, then re ‐ install
another tie wrap with its lock tab on top.

( Tie lock at bottom interferes with option card ).
4.
Remove the blanking end plate for the slot you are
installing the option card into.

(Retain the blanking end plate in case the option
card must be removed at a later date.)
Note
Slot 2 option card installation in a T ‐ 700
controller requires careful attention! See the
T ‐ 700 Mounting and Wiring Guide for more
details. This document focuses on installation
in a T ‐ 200/600 series controller.
5.
Carefully insert the pins of the NPB ‐ 2X ‐ 485 into
the socket of the appropriate option card slot. The
mounting holes on the option board should line
up with the standoffs on the base board. If they do
not, the connector is not properly aligned. Press
until the option card is completely seated.
6.
Place the custom end plate that came with the
NPB ‐ 2X ‐ 485 over its connector (see Figure 4 ).
Screws (4)
Option Slot 2
Area
T-200/600
Blanking
End Plate
Battery
Assembly

(includes

cable and
bracket)
Unplug
battery here
Option Slot 1 Area
Tie Wrap
Lock
(see Note )