Niagara NPB-2X-485, Инструкция по установке

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INSTALL SHEET
RS-485 Option Card
NPB-2X-485
RS-485 Option Card Install Sheet
Part Number 11873 Rev 1.1 Updated: January 16, 2012
1
JACE, Niagara Framework, Niagara AX Framework and the Sedona Framework are trademarks of Tridium, Inc.
This document covers the mounting and wiring of the
NPB ‐ 2X ‐ 485 option card in a Tridium
®
JACE
®
controller, including models T ‐ 200/600 (JACE 2/6),
T ‐ 700 (JACE 7), T ‐ 202/602 ‐ XPR (M2M JACE), or
Security JACE series.
Refer to the appropriate JACE
®
mounting and wiring
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).
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.
Note
An earlier NPB ‐ 2X ‐ 485 option card does not
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.
In general, only
one device
on an RS ‐ 485 trunk
should be biased. Otherwise, undue loading of the
circuit may result, with fewer devices supported.
Table 1 NPB-2X-485 option description.
Description Notes / COM Port Assignments
Dual port,
optically isolated
RS-485 adapter,
with two
3-position,
removable
screw-terminal
connector plugs.
See Figure 3 on
page 2 for
location of
Option Slots 1
and 2 on a
T-200/600.
Recent option cards have jumpers for
enabling onboard bias resistors. See
“Preparation,” page 1, for more details.
Most JACE models have two option slots,
where COM assignments are:
•
T-200/600, Security JACE: If single
RS-485 option in Slot 1: COM3, COM4.
If
two RS-485 options, ports are Slot 1:
COM3, COM4 and Slot 2: COM5, COM6.
•
T-700: If single RS-485 option in Slot 1:
COM5, COM6.
If
two RS-485 options, ports are Slot 1:
COM5, COM6 and Slot 2: COM7, COM8.
The T-202/602-XPR series (M2M JACE)
accepts only one option card, where ports
are COM7 and COM8.
Also see “COM Port Usage,” page 3.
S R
5 8 4
s
X R X T
X R X T
s
COM3 / COM5
COM7
COM4 / COM6
COM8
See Notes in
Table 1 .
Jumper pins to
enable RS-485
Bias resistors
(found on newer
cards only)
to bias
this port to bias
this port
Screened
diagram shows
how to enable a
port’s Bias
resistors

(two jumper
blocks on the
header pins).