Honeywell WEBsAX Series Guide

MOUNTING & WIRING GUIDE
74-4059—01
W-NXS and CP-NXS
This document covers the mounting and wiring of the WEBsAX, and Comfort Point
series controller. It assumes that you are an engineer, technician, or service person
who is performing control system installation. Instructions in this document apply to
the following products:
Note Complete details for mounting and wiring the companion LOGO!™Power and SITOP®modules listed above (power
supply, NXS-UPS modules) are furnished in separate documents, shipped with each module. They are covered in this
document only as applied to using them with the NXS.
Not covered in this document is the NiagaraAX or Niagara®R2 software installation and configuration required for a fully
functioning unit. This includes setting host IP address and password, as well as other parameters.
These are the main topic sections in this document:
•Product Description, page 2
•Preparation, page 4
•Precautions, page 4
•Mounting, page 6
•Wiring Details, page 11
•Status LEDs, page 19
•Power Up and Initial Checkout, page 19
Also included are several appendixes, as follows:
•Maintenance, page 20
•Certifications, page 31
Trademarks: Niagara Framework,and NiagaraAX are registered trademarks of Tridium Inc.
• SITOP is a registered trademark, and LOGO! is a trademark of Siemens AG.
• Echelon, LonWorks, and LON are registered trademarks of the Echelon Corporation.
• Microsoft and Windows are registered trademarks of the Microsoft Corporation.
• Intel and Celeron are registered trademarks of the Intel Corporation.
Models Description
WEB-NXS-R2
NXS controller with 40GB hard drive storage, Niagara Release 2 software, and a
LOGO!Power universal input power supply module. Both NXS and power supply module are
DIN-mountable.
W-NXS-AX-HD and
CP-NXS-AX-HD
NXS controller with 40GB hard drive storage, NiagaraAX software, and a LOGO!Power
universal input power supply module. Both NXS and power supply module are DIN-
mountable.
W-NXS-AX-FL and
CP-NXS-AX-FL
NXS controller with 1GB CompactFlash storage, NiagaraAX software, LOGO!Power universal
input power supply, both modules DIN-mountable. Includes the following additional option (2
modules):
NXS-UPSa:
aStandard on W-NXS-AX-FL and CP-NXS-AX-FL model. You can also use an NXS-UPS option for any hard-drive based NXS
model.
SITOP DC-USV-Modul 15: 24Vdc UPS module, DIN-mountable, plus:
SITOP Power Battery 24V/1.2Ah module for UPS, DIN-mountable.

W-NXS AND CP-NXS
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Product Description
The NXS is an ultra-compact, 24Vdc-powered, industrial PC platform, designed for DIN rail mounting. It provides
integral control, supervision, and network management solutions for wide variety of networked field devices. The
fanless design of the NXS incorporates an Intel®650 Mhz Celeron®processor and 512MB of system RAM. The OS
is Microsoft® Windows®XP Embedded, using either 1GB CompactFlash or a 40GB hard drive for storage (depending
on model).
The NXS uses DIN-mountable modules for power and UPS backup—refer to Table 1 for a summary and description
of onboard communications ports.
Although the normal operating mode for a NXS is “headless,” an onboard DVI/VGA port supports connection to a
CRT or LCD monitor (providing it has a DVI interface). A local console also requires connection of a USB-type
keyboard and mouse to the NXS USB ports.
Windows Notes
Regardless of NXS model, Windows “XP Embedded” is pre-installed on CompactFlash (W-NXS-AX-FL and CP-NXS-
AX-FL) or a hard drive (WEB-NXS-R2, W-NXS-AX-HD and CP-NXS-AX-HD ). No Windows CD is included. However,
a “Certificate of Authenticity” sticker is attached near the model number label.
Windows XP Embedded supports a “local desktop environment,” meaning the attachment of a keyboard, mouse, and
monitor. However, typical Windows access is done using a Microsoft “Remote Desktop” client connection to the unit,
as all models of NXS are factory-configured to support this. For related details, see “Local Console,” page 10.
Table 1 W-NXS features and options
Model Description Ports / Notes
W-NXS (all) and
CP-NXS (all)
Any model NXS (includes W-NXS-AX-FL, W-NXS-AX-HD,
and WEB-NXS-R2), DIN-mountable, with 512MB RAM,
and Windows XP Embedded OS pre-installed. Includes
brackets for alternate panel mounting. For 24Vdc
operation only, using supplied power supply, described
below.
LOGO!Power 24V/4A universal input power supply
module: 100–240Vac, 47–63 Hz input, 24Vdc output, 90W
power supply module, DIN-mountable
2 - 10/100 MB Ethernet, RJ-45
1 - RS-232 Serial, DB-9 male
1- RS-485 Serial, 3-pos. plug
1 - FTT-10A LON, 2-position plug
4 - USB (2.0)
NXS-UPS option
(standard with
W-NXS-AX-FLand
CP-NXS-AX-FL)
Includes SITOP DC-USV-Modul 15: 24Vdc output UPS
(uninterruptable power supply) module, DIN-mountable,
with communications to NXS for power monitoring.
Includes/requires battery module, below.
Connects to a USB port on the NXS.
Recommended in all cases, and
included/required if a Compact-
Flash based W-NXS-AX-FL and
CP-NXS-AX-FL. Includes two
separate SITOP modules,
described at left.
Includes SITOP Power Battery 24V/1.2Ah module, DIN-
mountable, use with SITOP DC-USV-Modul 15.

W-NXS AND CP-NXS
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Dimensions
Figure 1 shows dimensions of the NXS ready for DIN-mounting.
Figure 1 Dimensions of the NXS.
NXS Layout
Figure 2 shows the location of important features of the NXS, as oriented in its typical mounting position.
Figure 2 Layout of NXS features.
Top
10.35" (263 mm)
5.24"
(133mm)
0.39" (10 mm)
1.83"
(46.5 mm)
2.7"
(68.5 mm)
0.87" (22.0 mm)
5.6" (142 mm)
4.6" (116.8 mm)
Front (connectors) Side
NOTE: For dimensions with wall mounting
brackets installed, see Figure 8 on page 10.
Top frame
(holds LON
and RS-485).
Cover Plate for
CompactFlash module.
Status LEDs. See
“Status LEDs,” page 19.
Connector Ports
See Figure 9 on page 11
for more details.
Reset Button (recessed)
For emergency use only, to
trigger a hardware reset.

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Preparation
Unpack the NXS and inspect the contents of the package for damaged or missing components. If damaged, notify
the appropriate carrier at once and return any damaged components for immediate repair or replacement—See
“Returning a Defective Module” on page 30..
Included in this Package
Included in this package you should find the following items:
•a NXS controller
•a packing slip, which lists the factory settings for IP address, machine name, and host logon.
•a hardware bag including the following:
–One USB cable strain-relief bracket, with Torx T20 mounting screw.
–Two panel/wall mounting brackets, with Torx T20 mounting screws.
–One 2-position screw terminal plug, with locking screws, for 24Vdc power.
–One 3-position screw terminal plug, for RS-485 port.
–One 2-position screw terminal plug, for LON FTT-10.
Material and Tools Required
The following supplies and tools are required for installation:
•a LOGO!Power 24V/4A DC power supply, DIN-mountable (included in separate package)
•if a W-NXS-AX-FL or CP-NXS-AX-FL model (optional for other models), an NXS-UPS option consisting of two
modules:
–UPS module: SITOP DC-USV-Modul 15
–Battery module: SITOP Power Battery 24V/1.2Ah
•Inline fuse holder (Bussmann # HRF or # HMF or equivalent) and compatible 4A, 32V, fast-acting fuse
(Bussmann type # SFE-4 or equivalent).
•Suitable enclosure for housing the NXS and other modules, as applicable.
•35mm DIN rail(s) for mounting the NXS and other modules, as the recommended method.
•Suitable tools and supplies for mounting enclosures, NXS and other modules, and for making all wiring
terminations.
Note The following non-standard tools may be needed: Torx T20 screwdriver, for mounting USB
strain-relief bracket, and panel/wall mounting brackets (optional). Other Torx drivers (T8,
T10) may be needed later if performing maintenance, and covers must be removed.
Precautions
This document uses the following warning and caution conventions:
Caution Cautions remind the reader to be careful. They alert readers to situations where there is a chance that
the reader might perform an action that cannot be undone, might receive unexpected results, or might
lose data. Cautions contain an explanation of why the action is potentially problematic.
Warning Warnings alert the reader to proceed with extreme care. They alert readers to situations where
there is a chance that the reader might do something that can result in personal injury or
equipment damage. Warnings contain an explanation of why the action is potentially dangerous.

W-NXS AND CP-NXS
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Precautions are grouped into the following three categories:
•Safety Precautions
•Static Discharge Precautions
•General Precautions
Safety Precautions
The following items are warnings of a safety nature relating to the installation and start-up of the NXS controller. Be
sure to heed these warnings to prevent personal injury or equipment damage.
Warning • A 120Vac or 240Vac circuit powers the 24Vdc module (Power Supply) powering the NXS.
Disconnect power before installation or servicing to prevent electrical shock or equipment
damage.
•Make all connections in accordance with national and local electrical codes. Use copper
conductors only.
•To reduce the risk of fire or electrical shock, install in a controlled environment relatively free
of contaminants.
• This device is only intended for use as a monitoring and control device. To prevent data loss or
equipment damage, do not use it for any other purpose.
Static Discharge Precautions
Static charges produce voltages high enough to damage electronic components. The microprocessors and
associated circuitry within a NXS controller are sensitive to static discharge. The following items are cautionary notes
that will help prevent equipment damage or loss of data caused by static discharge.
Caution • Work in a static-free area.
•Discharge any static electricity you may have accumulated. Discharge static electricity by
touching a known, securely grounded object.
• Do not handle printed circuit boards (PCBs) without proper protection against static discharge.
Use a wrist strap when handling PCBs. The wrist strap clamp must be secured to earth ground.
General Precautions
Caution Do not install any expansion options (memory, PC/104 modules) apart from those already in the device,
or this
will void the warranty for the NXS . Note that the NXS already contains the maximum
about of allowable system RAM, at 512 MB.

W-NXS AND CP-NXS
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Mounting
Notes • This product is intended for indoor use only. The unit should not be exposed to ambient conditions outside
of the range of:
–Humidity: 5 to 80% at 25ºC (77ºF), non-condensing
–Temperature: 0ºC (32ºF) to 50ºC (122ºF) if CompactFlash (base) model, or
5ºC (41ºF) to 40ºC (104ºF) if hard drive option.
•Mechanical ambient conditions are as follows:
–Vibration, in operation:
•Flash-based model: 10 to 58 Hz: 0.075 mm, 58 to 500 Hz: 9.8 m/s2;
•with hard drive option and DIN mounting:
none permitted ;
•with hard drive option and wall mounting: 10 to 58 Hz: 0.035mm; 58 to 200 Hz: 4.9 m/s2
–Resistance to shock, in operation:
•Flash-based model: 150 m/s2, 11 ms;
•with hard drive option: 50 m/s2, 30 ms
•A minimum clearance of 3.94" (100mm) is required around all four sides of the NXS, between any
other devices and/or sides of the enclosure. See “Space Requirements,” page 7.
Mounting orientation is strongly recommended to be
horizontal only , with connectors at bottom,
to maximize heat dissipation.
The following sections provide more details:
•USB Strain-Relief
•Space Requirements
•DIN Rail Mounting
•Wall Mounting
USB Strain-Relief
A strain-relief bracket is included in the NXS hardware bag, for use with USB cables. Once mounted to the unit, you
can secure USB cables to the bracket using cable tie-wraps (not supplied). Securing cables to the bracket helps
prevent accidental detachment from the USB ports.
Use one of the provided pan-head screws (Torx T20 head) to mount the bracket below the ports. See Figure 3.
Figure 3 USB cable strain-relief bracket.
USB Cable
Strain-Relief
Bracket
USB Ports
Bracket
Mounting
Screw (T20)

W-NXS AND CP-NXS
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Space Requirements
A typical installation includes the power supply module, and NXS-UPS (UPS module and battery module). Depending
on the enclosure space available, mount the
NXS and other modules on either a single DIN rail, as shown in Figure 4,
or on two DIN rails, as shown in Figure 5 (preferred) or in Figure 6.
Figure 4 Single DIN-rail mounting of all devices.
Figure 5 Two DIN-rail mounting method A (preferred), NXS and Battery located below other modules.
NXS
Power Supply
SITOP UPS Battery
Width minimum 27.6" (701 mm): 501 mm total device width, plus 100 mm each side of NXS
Height minimum 13.1" (333 mm): 133 mm device height, plus 100 mm above and below NXS
3.94" (100 mm)
minimum, or
more if possible
3.94"
(100mm)
min.
3.94" (100mm)
min.
3.86"
(98 mm)
3.54"
(90 mm) 2.0"
(51 mm)
3.94"
(100 mm)
min.
5.24"
(133mm)
10.35" (263 mm)
NXS
Power Supply
SITOP UPS
Battery
Width minimum 22.1" (561 mm):
NXS and Battery modules
Height minimum 20.0" (508 mm) all devices both DIN rails
100 mm clearance all sides of NXS, 50 mm clearance top of
UPS
1.97" (50 mm)
min.
3.86"
(98 mm)
3.94"
(100 mm)
min.
3.94"
(100 mm)
min.
5.24"
(133mm)
4.92"
(125mm)
3.94"
(100 mm)
min.
10.35" (263 mm)
3.94" (100 mm)
minimum, or
more if possible

W-NXS AND CP-NXS
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In cases where there is less than 22.1" available width, you can alternatively mount all three modules above the NXS,
as shown in Figure 6 on page 8.
Figure 6 Two DIN-rail mounting method B (alternate), all modules located above NXS.
There are two mounting methods for the NXS: DIN Rail Mounting and Wall Mounting.
DIN Rail Mounting
DIN rail mounting is the preferred method. The following procedure provides step-by-step instructions for mounting
the NXS on DIN rail.
Procedure 1 To mount on DIN rail.
Step 1 Position the NXS on the DIN rail, tilting to hook clamps over the top edge of the rail (Figure 7).
Step 2 Swing the device down fully onto the DIN rail, until both clamps completely latch.
Step 3
Mount other modules (Power Supply, NXS-UPS, Battery) onto DIN rail in the same fashion—see the
installation document shipped with each module for complete details.
Step 4 If needed, secure devices with DIN rail end-clips provided by the DIN rail vendor.
NXS
NXS-PWR
SITOP UPS
Battery
Width minimum 18.3" (463 mm): NXS plus mins.
Height minimum 20.0" (508 mm) all
devices both DIN rails-- 100 mm clearance
all sides of NXS, 50 mm clearance
minimum top of UPS
1.97" (50 mm)
min.
3.86"
(98 mm)
3.94"
(100 mm)
min.
3.94"
(100 mm)
min.
5.24"
(133mm)
4.92"
(125mm)
3.94"
(100 mm)
min.
10.35" (263 mm)
3.86"
(98 mm)
2.0"
(51 mm)
3.94" (100 mm)
minimum, or
more if possible

W-NXS AND CP-NXS
974-4059—01
Figure 7 NXS mounting details.
Wall Mounting
To mount the NXS on a wall, remove the factory-installed DIN-rail mounting clamps from the back of the device, and
install the mounting brackets with the Torx T20 (M4 x 6mm) screws provided in the hardware bag. Procedure 2
provides step-by-step instructions for installing the brackets.
Procedure 2 To replace DIN-mount clamps with wall mount brackets.
Step 1 At the back of the unit, remove the four screws (A) securing the two DIN brackets, as shown below.
Step 2 Install the wall mount brackets using the supplied pan-head screws into the mounting holes, using four
screws in each bracket, as shown below.
Step 3 See Figure 8 for dimensions with wall mount brackets installed.
Mounting on DIN Rail Removing from DIN Rail
(A) (A)

W-NXS AND CP-NXS
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Figure 8 NXS dimensions with wall mounting brackets.
When mounting, ensure that a minimum of 3.94" (100 mm) clearance is maintained on all sides of the NXS from other
devices and/or enclosure walls. See “Space Requirements,” page 7 for more details.
Local Console
Typically, for initial software installation and commissioning, you access the NXS remotely, using NiagaraAX or
Niagara R2 software (Workbench platform connection or Admin Tool, respectively). In the case of applying Windows
updates or making Windows security setting changes, you connect remotely using the Microsoft “Remote Desktop”
software.
However, in some cases you may need a “local console” attached to the NXS, that is a keyboard, mouse, and monitor.
One example is after replacing the backup battery, to re-enter the BIOS setup data that was lost. Note that access of
the BIOS setup of a NXS is not possible over a network connection.
Please note the following about using a local console with the NXS:
•A USB type keyboard and mouse is required (no PS/2 type connectors).
•A DVI-capable display is needed, or a DVI-to-VGA adapter and a VGA monitor combination that has been
tested to work with the NXS.
•After attaching these items to the NXS, you must reboot the unit for local console operation.
11.7" (297 mm)
0.18" (4.5 mm)
3.94"
(100 mm)
0.65” (16.5 mm)
11.26" (286 mm)
10.35" (263 mm)
2.7"
(68.5 mm)
0.39" (10 mm)

W-NXS AND CP-NXS
11 74-4059—01
Wiring Details
All wiring is made to the front of the NXS—when mounted, this is the bottom of the unit. See Figure 9 for a layout of
connectors. Allow suitable slack for removing unit from DIN rail with wiring still connected.
Figure 9 NXS Connectors.
Make connections to the NXS in the following order:
1. Connect an earth grounding wire to a nearby earth grounding point, and to the earth ground screw (Phillips
head) on the NXS. See the “Grounding” section on page 12 for details.
2. Connect a standard USB A–B type cable between the NXS-UPS (if used) and one of the USB ports on the NXS.
Note that the UPS module must specifically configured. See “USB to NXS-UPS,” page 13.
3. Prepare the 24Vdc power source. The LOGO!Power 24V/4A module is typically used for 24Vdc power. In most
cases, two additional modules are used for UPS backup operation during AC power outages: the SITOP DC-
USV-Modul 15 (UPS) and SITOP battery module. See the “Power Input” section on page 14.
4. Connect the Ethernet cable. The NXS provides two (2) auto-sensing 10BASE-T or 100BASE-TX (RJ-45)
connectors. Use the
left RJ-45 connector as the primary port—see Figure 9.
Make this connection to your LAN (local area network).
5. Other connectors include an RS-232 serial port (DB-9 connector, COM1) and an RS-485 serial port (3-position,
COM2). Both ports can be used to support serially-connected integrations. In addition, the LON port supports
connection to a LonWorks 78-Kbaud free topology (FTT-10) network, using the two-pin connector plug. Wiring
is polarity insensitive.
Further wiring details are provided in these subsections:
•Grounding, page 12
•USB, page 12
•Power Input, page 14
•Ethernet, page 17
•RS-232, page 18
•RS-485, page 18
•LonWorks, page 18
RS-232 COM1 DVI/VGA USB 2.0 (4)
Power Input 24Vdc
RS-485 COM2
Primary Ethernet LAN 1
Secondary
Ethernet
LAN 2
Earth Grounding Terminal USB Strain-Relief Mounting Point
LonWorks
FTT-10

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Grounding
Connect a wire from a nearby earth ground to the protective earth terminal (Phillips-head screw, M4 x8mm) on the
NXS (see Figure 10). Minimum wire gauge (cross section) is 14 AWG (2.5mm2).
Figure 10 Connect earth ground using grounding wire to grounding lug.
Keep this grounding wire as short as possible.
USB
Four USB 2.0 ports are available, and are labeled “1”, “2”, “3,” and “4”—see Figure 11.
•Ports 1 and 2 are “low current” ports, capable of supplying up to 100 mA (0.1A).
•Ports 3 and 4 are “high current” ports, capable of supplying up to 500 mA (0.5A).
Figure 11 USB, Ethernet, and RS-485 ports.
The typical application for a USB port is for communications to a NXS-UPS. See the “USB to NXS-UPS” section on
page 13.
USB ports can also be used with a USB-type PC keyboard and PC mouse, if a local console is needed. Note that the
NXS must be rebooted after attaching a PC keyboard for it to be operational.
Earth Ground
Earth Ground
Terminal, M4 x8mm,
Phillips-head
14 AWG or larger
USB 2.0
Ports (4)
USB Ports 1
and 2 limited to
supplying
100mA each.
1
2
3
4
USB Ports 3
and 4 can
supply up to
500mA each.
Ethernet 1
Primary Port
Ethernet 2
(Use optional)

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USB to NXS-UPS
If installed with the NXS-UPS modules, connect a USB “A–B type” cable between the SITOP UPS and one of the
USB ports on the NXS (any one). In addition, you must set the DIP switches on the NXS-UPS to specific positions,
for operation with Niagara software. See Figure 12 and Tabl e 2 .
Figure 12 USB to NXS-UPS connections.
Table 2 DIP switch settings on SITOP UPS for use with NXS.
NXS-UPS DIP Switch Default/Recommended Setting
Switch Pos. (0=Off)
10
Cut-in threshold is 22.5 volts.20
31(On)
40
End-of-charge voltage is 27.0 volts.
50
61(On)
70
81(On)
90
10 0 Charging current is 0.7A.
L+
M
L+
M
B+
B–
In
Out
Bat
L+
M
L+
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
SITOP UPS
NXS
USB A–B type Cable
See Table 2 for DIP
switch details.

W-NXS AND CP-NXS
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Power Input
Review the “Safety Precautions,” page 5. Typically, power wiring involves all modules listed in Ta b le 3.
See the following sections for more details:
•Power Wiring Between Modules
•Connecting the 24 Vdc Supply
Power Wiring Between Modules
•Figure 13 shows typical power wiring connections for NXS without the NXS-UPS option.
•Figure 14 shows power wiring connections for the NXS with NXS-UPS option (W-NXS-AX-FL and CP-NXS-
AX-FL).
11(On)
Buffering time set is 95 seconds.
20
30
41(On)
50
60
71(On)
8 1 (On) 5 second disconnect at end of buffering time.
91(On)
Battery in ON state (as an alternative, jumper
terminals X2.9–X2.10). This provides a way to
disconnect the battery.
Table 3 Power, UPS and battery modules for NXS.
Module Description Notes
Power
Supply
LOGO!Power 100–240Vac input, 24Vdc output,
90W power supply module, DIN-mountable.
Mount and wire according to shipped installation
document. Also see “Power Wiring Between
Modules,” page 14.
NXS-UPS
SITOP DC-USV-Modul 15, 24Vdc output UPS
(uninterruptable power supply) module, DIN-
mountable, with communications to NXS for
power monitoring.
Mount and wire according to shipped installation
document. Also see “USB to NXS-UPS,” page 13,
and “Power Wiring Between Modules,” page 14.
SITOP Power Battery 24V/1.2Ah battery pack
module, DIN-mountable, for use with UPS.
Mount and wire according to shipped installation
document. Also see “Power Wiring Between
Modules,” page 14.
Table 2 DIP switch settings on SITOP UPS for use with NXS.
NXS-UPS DIP Switch Default/Recommended Setting
Switch Pos. (0=Off)

W-NXS AND CP-NXS
15 74-4059—01
Figure 13 Power-related connections for NXS without NXS-UPS option.
Figure 14 Power-related connections between modules for NXS with NXS-UPS option.
+–
LN
L+ M
Power
Supply
NXS
100–240VAC
Line Neutral
24Vdc NOTES: The recommended range of wire gauge
(cross section) for making 24 Vdc connections is
from 18 AWG (0.75mm2) to 14 AWG (2.5mm2).
Do not install power wiring in cables or raceways
with communications wiring.
Use copper conductors only.
Fuse 4A, 32V
see “Material and Tools
Required,” page 4
L+
M
L+
M
B+
B–
In
Out
Bat
+–
+–
LN
L+ M
Power
Supply
NXS
SITOP Battery
SITOP UPS
100–240VAC
Line Neutral
24Vdc NOTES: The recommended range of wire gauge
(cross section) for making 24 Vdc connections is
from 18 AWG (0.75mm2) to 14 AWG (2.5mm2).
Do not install power wiring in cables or raceways
with communications wiring.
Use copper conductors only.
Fuse 4A, 32V
see “Material and Tools
Required,” page 4

W-NXS AND CP-NXS
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Connecting the 24 Vdc Supply
Caution Before powering the NXS, note the following:
•Use only the special connector plug supplied with the unit to connect supply voltage.
•The device should only be connected to a 24Vdc power supply that satisfies the requirements of safe
extra low voltage (SELV).
•When the device is operated on a wall, in an open rack, or other similar locations, an NEC Class 2 current
source must be used for UL requirements (in accordance with UL 60950-1). In all other cases, in
accordance with IEC / EN / DIN EN 60950-1, it is necessary to use either a power source of limited
performance (LPS - Low Power Source), or use a line-side fuse or line-side power switch. Power needs
to be limited to less than 8 A. The recommended fuse rating is 4 A.
For operation in closed cabinets or fireproofing cabinets (including the operation of a cabinet in accordance with UL508),
there are no requirements for current limiting of supply voltage.
Note If the NXS uses a CompactFlash card, make sure that the card if properly seated before powering the unit.
See Figure 2 on page 3 for location of the CompactFlash card cover.
Procedure 3 provides instructions for connecting the 24 Vdc power supply.

W-NXS AND CP-NXS
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Procedure 3 To connect 24 Vdc power to the NXS.
Step 1 Switch off the power source for the 24 Vdc supply.
Step 2 Wire the 24 Vdc source (typically from the
NXS-UPS “Out” terminals) to the 2-position connector plug
included with the
NXS. The power input connector is shown below.
The recommended range of wire gauge (cross section) for making 24 Vdc connections is from 18 AWG
(0.75mm2) to 14 AWG (2.5mm2).
Step 3
Insert the power connector plug into the NXS .
Step 4 When finished making other wiring connections, restore the power source to the 24 Vdc supply.
Ethernet
Two, female RJ-45, 10/100-Mbit Ethernet ports are provided on the NXS, numbered “1” and “2.”
The
1 (left) port is the primary Ethernet port. See Figure 11 on page 12.
Note Typically, you only use the left (primary port), unless you have a specific application for isolating a driver’s
network traffic to a separate IP address (and LAN) using the right port. The packing slip accompanying the
NXS will provide the “factory-shipped” IP settings for both Ethernet ports. Refer to the appropriate NiagaraAX
or Niagara R2 “startup guide” for details on changing IP address.
Use a standard Category 5 Ethernet patch cable for connecting to a hub or Ethernet switch on the LAN. The maximum
end-to-end distance from the controller to the hub is 328 feet (100m).
Note The NXS is not a “hub” that can forward Ethernet packets between attached segments.
Each Ethernet port has two LEDs:
•Link (Green): Remains lit whenever an Ethernet link is established.
•Activity (Yellow): Lit with blinking to indicate activity on the LAN.
Also see “Status LEDs,” page 19.
M (24V– in)
L+ (24V+ in) NOTES: Install an inline, 4A, 32V fast-acting fuse
on the “L+” wiring to the NXS. See Figure 13 and
Figure 14.
Do not install power wiring in cables or raceways
with communications wiring.
Use copper conductors only.

W-NXS AND CP-NXS
74-4059—01 18
RS-232
A standard RS-232 serial port uses a DB-9 male connector, and is labeled “COM” (see Figure 9 on page 11). It
operates as COM1 in software. A standard “null-modem” cable can be used to communicate to another DTE device,
or a “straight-through” cable can be used to communicate to a DCE device, such as a modem.
Note Use only shielded cable for any RS-232 connection, such as available with a standard (pre-fabricated)
straight-though or null-modem cable. If fabricating a cable, connect the shield (drain) wire to the DB-9S
(socket) connector shell at the JACE end only—do not connect the drain wire at the other end.
RS-485
An RS-485, optically isolated port uses a 3-position, screw terminal connector and always operates as COM2. Wire
to this connector with shielded 18-22AWG wiring (refer to the TIA/EIA-485 standard). As shown in Figure 15, the RS-
485 screw terminals (from left-to-right) are shield (GND), Data plus (+), and Data minus (–).
Figure 15 RS-485 port (COM2) pinouts
LonWorks
A single, two-pin, male LonWorks FTT-10A connector port and wiring plug is available (see Figure 15). This
connection supports twisted pair, unshielded, polarity-insensitive, peer-to-peer communications at 78 Kbps.
Refer to the LonWorks FTT-10A Free Topology Transceiver User’s Guide (078-0156-01F) for technical guidelines
associated with free topology restrictions, and the Junction Box and Wiring Guidelines for Twisted Pair LonWorks
Networks (005-0023-01) for more detailed information on wiring specifications. These documents are available on
Echelon’s web site (www.echelon.com).
RS-485 port
GND D+D–
FTT-10A
LON

W-NXS AND CP-NXS
19 74-4059—01
Status LEDs
The NXS has five LEDs located above the DB-9 COM1 port, as described in Ta ble 4 below.
During typical operation, only two of the LEDs above are illuminated: PWR (yellow) and RUN (green).
Power Up and Initial Checkout
Once you have installed the NXS and completed all wiring, power on the unit. See “Connecting the 24 Vdc Supply,”
page 16. Verify that the PWR and RUN Status LEDs light and remain lit.
Notes • Windows takes up to 1-1/2 minutes to load on the NXS.
•Once the operating system has been successfully loaded, you can commission the controller over the
network using the appropriate Niagara host platform tool. This is the recommended method to access
any Niagara controller.
A NXS can also be accessed over a LAN using a networked Windows PC and a Remote Desktop Connection (Windows
Terminal Services).
Related Documentation
For more information on configuring and using the NXS controller, consult the following documents:
•NXS with NiagaraAX
–NXS Install and Startup Guide
–NiagaraAX Platform User Guide
–NiagaraAX User Guide
•NXS with Niagara R2
–NXS Install and Startup Guide
–Using the Niagara Admin Tool
–Niagara Standard Programming Reference
Table 4 Status LEDs.
Status LEDs Label Meaning LED Description
PWR Power Supply
Off Isolated from supply voltage.
Yello
wSupply voltage available.
RUN Operation
Off No access to PCI bus.
Gree
n
Access to PCI bus, onboard, and ISA
peripherals.
WD Watchdog
status display
Off Watchdog disabled (normal configuration).
Gree
n
Watchdog enabled, monitoring time not
expired.
Red Watchdog enabled, monitoring time
expired.
L1 LED 1 Yello
wNot currently used (normally Off).
L2 LED 2 Yello
wNot currently used (normally Off).

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74-4059—01 20
Maintenance
Tools needed when opening and working in the NXS include the following:
•Front cover and top cover plates: Torx T8 driver
•Hard disk mounting: Torx T10 driver
•Protective earth terminal: Phillips-head driver
•Spacing bolts for PC/104 cards: 7/32" hex socket/nut driver, 5mm (hex) socket/nut driver
Note Remove power from the NXS before beginning any maintenance.
As needed, use the following procedures to perform maintenance tasks on the NXS controller:
•Open the device (front panel), page 20
•Replacing the backup battery, page 21
•BIOS Setup, page 22
•Removing/installing a CompactFlash card, page 25
•Replacing the SDRAM memory module, page 27
•Replacing the LON option board, page 28
•Replacing the hard disk, page 29
Open the device (front panel)
Caution The NXS contains electronic components that are vulnerable to static discharge. Therefore, take
precautionary measures before opening the device. See “Static Discharge Precautions,” page 5.
Procedure 4 To open the NXS front panel
Step 1 Remove the six Torx T8 screws, setting them aside.
Step 2 Remove the front panel.
Note To close the device, simply realign the front panel on the frame, and refasten the six Torx T8 screws.