Niagara NPB-2X-485, Install Sheet, Page: 3 / 4

Wiring
COM Port Usage
RS-485 Option Card Install Sheet
Part Number 11873 Rev 1.1 Updated: January 16, 2012
3
Figure 4 NPB-2X-485 inserted, end plate on top.
7.
If unplugged, plug the battery cable back into the
battery connector on the JACE (see Figure 4 for
location on the T ‐ 200/600).
8.
For the T ‐ 200/600 series or Security JACE, set the
battery and bracket assembly back over the option
card slots, with mounting holes aligned with the
standoffs. Screws enter holes in the battery
bracket first.
Figure 5 Re-fasten screws.
9.
Place the screws through the end plate(s), and into
the standoffs on the base board. Using a
screwdriver, hand tighten screws.
10.
Replace the JACE cover or covers
(T ‐ 202/602 ‐ XPR).
11.
If accessory modules were unplugged from the
JACE, plug them back as before, and secure.
Wiring
Connect to an RS ‐ 485 multipoint network using one of
the 3 ‐ position screw terminal connectors, using
shielded 18 ‐ 22 AWG wiring. Refer to the TIA/EIA ‐ 485
standard for more details.
Screw terminals are minus (–), plus (+), and shield ( S ),
as indicated on the NPB ‐ 2X ‐ 485 end plate label—see
Figure 1 on page 1.
LEDs
Four LEDs are visible on the top of the NPB ‐ 2X ‐ 485
option card (cover must be removed from JACE). The
label on the NPB ‐ 2X ‐ 485 end plate notes these four
LEDs as “TX” and “RX”—see Figure 1 on page 1.
The two LEDs for each port are described as follows:
•
TX (yellow) — Transmit, indicates that the JACE is
sending data to a device connected on the RS ‐ 485
trunk.
•
RX (green) — Receive, indicates that the JACE is
receiving data from a device connected on the
RS ‐ 485 trunk
COM Port Usage
The NPB ‐ 2X ‐ 485 option card has two onboard UARTs,
and so adds two COM ports on the installed JACE
controller. The hosted station automatically resolves
the option’s COM addresses.
•
If a T ‐ 200/600 or Security JACE controller and
installed in Option Slot 1, or if the only option card,
ports are COM3 and COM4.
•
If a T ‐ 700 controller and installed in Option Slot 1, or
if the only option card, ports are COM5 and COM6.
If installed in Slot 1 of a JACE along with another option
card that uses COM ports in Option Slot 2, note that
COM assignments for that other card are affected.
For example, if aT ‐ 200/600 with a NPB ‐ 2X ‐ 485 option
installed in Slot 1, and a single port RS ‐ 232 option
(T ‐ NPB ‐ 232) installed in Slot 2, COM assignments are:
Slot 1 (RS ‐ 485): COM3, COM4, Slot 2 (RS ‐ 232): COM5.
The same option card mix in a T ‐ 700 controller yields:
Slot 1 (RS ‐ 485): COM5, COM6, Slot 2 (RS ‐ 232): COM7
The NPB ‐ 2X ‐ 485 installed in the only (single) option slot
of a T ‐ 202/602 ‐ XPR (M2M JACE) controller is seen as
COM7 and COM8.
Place custom end
plate over end of
option card.
Insert option card into
option card slot
carefully, with pins
aligned .
Fully seat card.
JACE Battery
Connector
T-200/600
T-200/600
Hand tighten the

4 screws through
battery bracket,
end plates, into
standoffs.