Niagara NPB-2X-485 Install Sheet

This document covers the mounting and wiring of the
NPB‐2X‐485 option card in a Tridium
controller, including models T‐200/600 (JACE 2/6),
T‐700 (JACE 7), T‐202/602‐XPR (M2M JACE), or
Security JACE series.
Table 1 NPB-2X-485 option description.
Description Notes / COM Port Assignments
Dual port, Recent option cards have jumpers for
enabling onboard bias resistors. See
optically isolated
RS-485 adapter, "Preparation,"
with two
Most JACE models have two option slots,
3-position,
where COM assignments are:
removable
•
T-200/600, Security JACE: If single
screw-terminal
RS-485 option in Slot 1: COM3, COM4.
connector plugs.
If two RS-485 options, ports are Slot 1:
COM3, COM4 and Slot 2: COM5, COM6.
See Figure 3 on
•
T-700: If single RS-485 option in Slot 1:
page 2 for
COM5, COM6.
location of
If two RS-485 options, ports are Slot 1:
Option Slots 1
COM5, COM6 and Slot 2: COM7, COM8.
and 2 on a
The T-202/602-XPR series (M2M JACE)
T-200/600.
accepts only one option card, where ports
are COM7 and COM8.
Also see "COM Port Usage,"
Refer to the appropriate JACE
document for further installation details.
Included in this Package
Included in this package find the following items:
• NPB‐2X‐485 option card, connector end plate, and
(if recent model) four 2‐pin jumper blocks.
• Two 3‐position terminal plugs, for wiring to an
RS‐485 network.
• This NPB‐2X‐485 Option Install Sheet, Part
Number 11873 Rev 1.1.
Material and Tools Required
The following may be required for installation:
• #2 Phillips screwdriver: used to install the card.
• Small flat‐blade screwdriver: used for making
wiring connections to the RS‐485 networks.
• #1 Phillips screwdriver: to remove and refasten
T‐202/602‐XPR covers (if applicable).
JACE, Niagara Framework, Niagara AX Framework and the Sedona Framework are trademarks of Tridium, Inc.
RS-485 Option Card Install Sheet
Part Number 11873 Rev 1.1
RS-485 Option Card
NPB-2X-485
INSTALL SHEET
® ®
JACE
page 1, for more details.
page 3.
®
mounting and wiring
Updated: January 16, 2012
Figure 1 NPB-2X-485 option.
Preparation
Examine the component side of the option card to see
if bias resistor jumper pins are available. See Figure 2.
If so, you may wish to enable biasing for either (or
both) RS‐485 ports before mounting the card—you
cannot reach these jumpers when the card is installed.
Figure 2 Jumpers to enable RS-485 bias resistors.
to bias to bias
this port
this port
An earlier NPB‐2X‐485 option card does not
Note
have Bias jumpers. It operates like the newer
option card in factory‐shipped state (jumper
blocks not installed—no biasing).
Installing jumpers to enable biasing adds two onboard
3.3K ohm resistors into an RS‐485 port's circuit:
• from RS‐485 "+" to 5V.
• from RS‐485 "–" to Ground.
Biasing sometimes improves RS‐485 communications
by eliminating "indeterminate" idle states.
one device
In general, only
should be biased. Otherwise, undue loading of the
circuit may result, with fewer devices supported.
COM3 / COM5
T X R X
COM7
s
R S
See Notes in
4 8 5
Table 1.
COM4 / COM6
T X R X
s
COM8
Screened
diagram shows
how to enable a
port's Bias
resistors 
(two jumper
blocks on the
header pins).
Jumper pins to
enable RS-485
Bias resistors
(found on newer
cards only)
on an RS‐485 trunk
1