National Instruments NI WSN-9791 User Manual

USER GUIDE AND SPECIFICATIONS

NI WSN-9791 Ethernet Gateway

This user guide describes how to use the NI Wireless Sensor Network WSN-9791 Ethernet gateway and
lists specifications. The NI WSN-9791 provides an Ethernet data acquisition interface. The
NI WSN-9791 combines with NI WSN-32xx nodes to form a wireless sensor network. Figure 1 shows
the components of the NI WSN system.

1

2

4

1 PC or NI Real-Time Hardware Running

Application Software

2 NI WSN-9791 Ethernet Gateway

5

3

3 NI WSN-32xx Nodes
4 Ethernet Cable/Connection
5 9–30 VDC Power Supply Connection

Figure 1. NI WSN System Components

3

Figure 2 shows a close up of the NI WSN-9791.

NI WSN-9791

117.54 mm
(4.628 in.)

146.88 mm
(5.783 in.)

165.94 mm
(6.533 in.)

60.18 mm
(2.369 in.)

112.97 mm
(4.448 in.)

88.33 mm
(3.478 in.)

3.088 in.

(78.44 mm)

51.29 mm
(2.019 in.)

44.32 mm
(1.745 in.)

87.50 mm
(3.445 in.)

Dimensions

Figure 3 shows the NI WSN-9791 device dimensions.

Figure 2. NI WSN-9791 Ethernet Gateway

NI WSN-9791 User Guide and Specifications 2 ni.com

Figure 3. NI WSN-9791 Device Dimensions

Safety Guidelines

Operate the NI WSN-9791 only as described in this user guide.

Hot Surface This icon denotes that the component may be hot. Touching this component may result

in bodily injury.

NI WSN Safety Information

The following section contains important safety information that you must follow when installing and
using NI WSN products.

Caution Do not substitute parts or modify the NI WSN product. Use the product only with the

devices, accessories, and cables specified in the installation instructions.

Caution Do not operate a NI WSN products in an explosive atmosphere or where there may be

flammable gases or fumes. If you need to operate NI WSN products in such an environment, the
NI WSN products must be in a suitably rated enclosure.

Caution If you need to clean a NI WSN product, use a dry towel. The product must be completely

dry and free from contaminants before you return it to service.

Caution Operate the product only at or below Pollution Degree 2. Pollution is foreign matter in a

solid, liquid, or gaseous state that can reduce dielectric strength or surface resistivity. The following
is a description of pollution degrees:

• Pollution Degree 1 means no pollution or only dry, nonconductive pollution occurs. The pollution
has no influence.

• Pollution Degree 2 means that only nonconductive pollution occurs in most cases. Occasionally,
however, a temporary conductivity caused by condensation must be expected.

• Pollution Degree 3 means that conductive pollution occurs, or dry, nonconductive pollution occurs
which becomes conductive due to condensation.

Caution You must insulate signal connections for the maximum voltage for which the NI WSN

product is rated. Do not exceed the maximum ratings for the product. Do not install wiring while
the product is live with electrical signals. Do not remove or add connector blocks when power is
connected to the NI WSN system. Avoid contact between your body and the connector block signal
wiring when hot-swapping devices.

1

Operate NI WSN products at or below the installation category

marked on the hardware label.
Measurement circuits are subjected to working voltages2 and transient stresses (overvoltage) from
the circuit to which they are connected during measurement or test. Installation categories establish
standard impulse withstand voltage levels that commonly occur in electrical distribution systems.
The following is a description of installation categories:

• Installation Category I is for measurements performed on circuits not directly connected to the

3

electrical distribution system referred to as MAINS

voltage. This category is for measurements of

voltages from specially protected secondary circuits. Such voltage measurements include signal

1

Installation categories, also referred to as measurement categories, are defined in electrical safety standard IEC 61010-1.

2

Working voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.

3

MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may
be connected to the MAINS for measuring purposes.

© National Instruments Corporation 3 NI WSN-9791 User Guide and Specifications

levels, special equipment, limited-energy parts of equipment, circuits powered by regulated
low-voltage sources, and electronics.

• Installation Category II is for measurements performed on circuits directly connected to the
electrical distribution system. This category refers to local-level electrical distribution, such as that
provided by a standard wall outlet (for example, 115 V for U.S. or 230 V for Europe). Examples
of Installation Category II are measurements performed on household appliances, portable tools,
and similar products.

• Installation Category III is for measurements performed in the building installation at the
distribution level. This category refers to measurements on hard-wired equipment such as
equipment in fixed installations, distribution boards, and circuit breakers. Other examples are
wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation,
and stationary motors with permanent connections to fixed installations.

• Installation Category IV is for measurements performed at the primary electrical supply
installation (<1,000 V). Examples include electricity meters and measurements on primary
overcurrent protection devices and on ripple control units.

Safety Guidelines for Hazardous Locations

The NI WSN-9791 is suitable for use in Class I, Division 2, Groups A, B, C, D, T4 hazardous locations;
Class I, Zone 2, AEx nC IIC T4 and Ex nL IIC T4 hazardous locations; and nonhazardous locations
only. Follow these guidelines if you are installing the NI WSN-9791 in a potentially explosive
environment. Not following these guidelines may result in serious injury or death.

Caution Do not disconnect the power supply wires and connectors from the gateway unless power

has been switched off.

Caution Do not install or remove the gateway unless power has been switched off.

Caution Substitution of components may impair suitability for Class I, Division 2.

Caution For Zone 2 applications, install the WSN system in an enclosure rated to at least IP 54 as

defined by IEC 60529 and EN 60529.

Special Conditions for Hazardous Locations Use in Europe

The NI WSN-9791 has been evaluated as Ex nA nL IIC T4 equipment under DEMKO Certificate No. 07
ATEX 0626664X. Each gateway is marked II 3G and is suitable for use in Zone 2 hazardous locations,
in ambient temperatures of –40 °C ≤ Ta ≤ 70 °C.

NI WSN-9791 User Guide and Specifications 4 ni.com

Electromagnetic Compatibility Guidelines

This product was tested and complies with the regulatory requirements and limits for electromagnetic
compatibility (EMC) as stated in the product specifications. These requirements and limits are designed
to provide reasonable protection against harmful interference when the product is operated in its
intended operational electromagnetic environment.

This product is intended for use in industrial locations. There is no guarantee that harmful interference
will not occur in a particular installation, when the product is connected to a test object, or if the product
is used in residential areas. To minimize the potential for the product to cause interference to radio and
television reception or to experience unacceptable performance degradation, install and use this product
in strict accordance with the instructions in the product documentation.

Furthermore, any changes or modifications to the product not expressly approved by National
Instruments could void your authority to operate it under your local regulatory rules.

The following statements contain important EMC information needed before installing and using this
product:

Caution This product is intended for use in industrial locations. As a result, this product may cause

interference if used in residential areas. Such use must be avoided unless the user takes special
measures to reduce electromagnetic emissions to prevent interference to the reception of radio and
television broadcasts.

Caution Changes or modifications not expressly approved by National Instruments could void the

your authority to operate the hardware under the local regulatory rules.

Caution Operate this product only with shielded cables and accessories.

Related Documentation

Check ni.com/manuals for the most recent hardware documentation. For a complete list of
documentation related to the NI WSN system, refer to ni.com/info and enter rdwsnrd.

In addition to this guide, the following documents may be useful when configuring your NI WSN
system:

• NI Wireless Sensor Network Getting Started Guide

• NI WSN-32xx User Guide and Specifications

• Configuring WSN in MAX, available from Start»All Programs»National Instruments»NI-WSN

• The NI-WSN book on the Contents tab of the LabVIEW Help available by selecting Help»Search
the LabVIEW Help in LabVIEW

• NI-WSN Readme, available on the software installation disc included with your device.

Training Courses

If you need more help getting started developing an application with NI products, NI offers training
courses. To enroll in a course or obtain a detailed course outline, refer to

Technical Support on the Web

For additional support, refer to ni.com/support or zone.ni.com.

ni.com/training.

© National Instruments Corporation 5 NI WSN-9791 User Guide and Specifications

Software Overview

Note Refer to the NI WSN Readme, available on the software installation disc included with your

device, for NI software application version support.

The NI-WSN software includes NI Measurement and Automation Explorer (MAX) as well as server and
driver software for easy integration into application software packages. These software components
manage the low-level communications and hardware details, simplifying programmatic access to
I/O channels. The NI-WSN software is on the software installation disc included with your
NI WSN-9791 gateway device. The NI-WSN software is supported by Windows 7/Vista/XP and
contains the following components:

•NI MAX

• NI-WSN software

You can download a current version of the NI-WSN software from
browser, go to ni.com/support and select Drivers and Updates»Distributed I/O»Wireless Sensor
Networks, then select the latest version of NI-WSN software. If you are using other software, refer to
the installation instructions that accompany your software.

What You Need to Get Started

To set up and use NI LabVIEW for WSN with the NI WSN-9791, you need the following:

• NI WSN-9791 Ethernet Gateway device(s), with 9–30 V power supply

•NI WSN-32xx node devices with a 9–30 V power supply or four 1.5 V AA alkaline for each node

• Mounting hardware (DIN rail, panel-mount, or rack mount accessory)

• Ethernet cable/connection

• Screwdrivers: a 1/8 in. flathead and a number 1 Phillips

• NI-WSN software version 1.1 or later

• Host PC running Windows 7/Vista/XP

• NI LabVIEW version 8.6.1 (32-bit) or later

• NI LabVIEW Real-Time Module (32-bit)

• Related hardware and software documentation

• Optional accessories

• DIN rail terminal blocks

• I/O cables and sensors

• Mounting accessory

ni.com/support. Using your web

NI WSN-9791 User Guide and Specifications 6 ni.com

Unpack the Devices and Install the Antenna

Remove the devices from the package and inspect the device. Contact NI if the device appears damaged.
Do not install a damaged device.

Caution The device is static sensitive. Always properly ground yourself and the equipment when

handling or connecting to the device.

To attach the antenna, align the antenna with the mount and screw it on as shown in Figure 4.

Caution The antenna must be attached to the NI WSN device in order for the NI WSN device to

function correctly.

Figure 4. Attach Antenna to Device

Mounting the NI WSN-9791 Device

You can mount the NI WSN-9791 device on a panel or on a 35 mm DIN rail. For kit accessory ordering
information, refer to the accessory section of the NI WSN product page at

Caution Your installation must meet the following requirements:

• Allows 25.4 mm (1 in.) of clearance above and below the NI WSN-9791 device for air
circulation.

• Allows 50.8 mm (2 in.) of clearance in front of modules for common connector cabling, such as

the 2-position detachable screw terminal connector

© National Instruments Corporation 7 NI WSN-9791 User Guide and Specifications

.

ni.com.

NI WSN-9791

3.18 mm
(0.125 in.)

3.18 mm

(0.125 in.)

114.30 mm

(4.500 in.)

45.72 mm
(1.800 in.)

55.88 mm
(2.200 in.)

101.60 mm
(4.000 in.)

Note Figure 5 is an actual size template. You can print it out and use it to determine screw hole

placement for panel mounting.

Figure 5. NI WSN-9791 Panel Mount Dimensions Template

NI WSN-9791 User Guide and Specifications 8 ni.com

Using the Integrated Panel Mount Feature

4.500 in.

(114.30 mm)

The NI WSN-9791 integrated panel mount feature accepts number 8 or M4 pan head screws to secure
the device onto a flat surface. To install the NI WSN-9791 on a flat surface, complete the following
steps:

1. Prepare two holes in your panel 4.448 in. (112.97 mm) on center to accept the number 8 or M4 pan
head screws or bolts.

2. Install the front screw first in the mounting panel leaving .08 in. space under the head of the screw.

3. Slide the NI WSN-9791 front mount under this screw.

4. Fasten the rear screw into place through the rear enclosure mount of the NI WSN-9791.

Figure 6. Using the Integrated Mount Feature

© National Instruments Corporation 9 NI WSN-9791 User Guide and Specifications

Attaching to the NI WSN-3282 DIN Rail

Caution Power off the device before mounting it to the DIN rail.

The NI WSN-3282 DIN rail kit, NI part number 781074-01, contains one clip for mounting the device
on a standard 35 mm DIN rail. To mount the device on a DIN rail, complete the following steps:

1. Fasten the DIN rail clip to the device using a number 1 Phillips screwdriver and four 4-20,
5/16 inch length thread-forming screws. The screws are included in the DIN rail kit.

2. Make sure the DIN rail kit is installed as shown in Figure 7, with the larger lip of the DIN rail
positioned up.

Note Use thread-forming screws to permanently affix the DIN rail clip to the device. Unscrewing

and reinstalling the thread-forming screws will produce a compromised connection between the
DIN rail clip and the device.

Figure 7. NI WSN-9791 Device DIN Rail Installation

Figure 8. DIN Rail Installation Pictured Without the NI WSN-9791

NI WSN-9791 User Guide and Specifications 10 ni.com

Attaching to the NI WSN-3283 Panel Mount Plate

The NI WSN-3283 panel mount kit, NI part number 781075-01, contains a plate for mounting the device
to a panel. To mount the device, complete the following steps:

1. Fasten the plate to the device using a number 1 Phillips screwdriver and four 4-20, 5/16 inch length
thread-forming screws, as shown in Figure 9. The screws are included in the NI WSN-3283 panel
mount kit.

Figure 9. Mounting the NI WSN-9791 to the Panel Mount Plate

2. Attach the device and attached plate to a wall or other surface using four to six number 8 or M4
screws. Refer to Figure 5 for the mounting hole template.

© National Instruments Corporation 11 NI WSN-9791 User Guide and Specifications

Setting Up the NI WSN-9791 Device

Complete the following steps to prepare the NI WSN-9791 device for use:

1. Before connecting the hardware, install NI LabVIEW and the NI-WSN driver software. You must
be an Administrator to install NI software and devices on your computer. The NI-WSN driver
software is on the software installation disc included with your device and is available for download
at ni.com/support. You must have NI LabVIEW version 8.6.1 or later installed to use NI WSN
devices. Refer to the instructions included with your NI LabVIEW software to install
NI LabVIEW. Once NI LabVIEW is installed, complete the following steps:

2. Close all other applications.

3. Insert the NI-WSN software installation disc into the drive on your computer.

4. Follow the onscreen instructions to install the NI-WSN software and NI MAX.

Note The NI Wireless Sensor Network Getting Started Guide is available after installation

from Start»All Programs»National Instruments»NI-WSN.

5. Make sure the NI WSN-9791 device power is disconnected.

Powering the NI WSN-9791 Device

Caution You must use a UL Listed ITE power supply marked LPS with the NI 9791. The power

supply must also meet any safety and compliance requirements for the country of use.

To connect an external power supply to the NI WSN-9791, complete the following steps:

1. Remove the 2-position mini-combicon plug from the device, loosening the retaining screws
if necessary.

Figure 10. 2 Mini-Combicon Connector

2. Connect the positive lead of the external power supply to the V terminal.

3. Connect the negative (common) lead to the C terminal.

4. Reinstall the 2-position mini-combicon plug in the device and tighten the retaining screws.

10/100BaseT(X) Ethernet Port Connection

Use a standard Category 5 (CAT-5) Ethernet cable (a shielded cable is recommended) to connect the
NI WSN-9791 device to an Ethernet hub or to a computer.

NI WSN-9791 User Guide and Specifications 12 ni.com

Device Interface

Figure 11 shows the NI WSN-9791 device interface.

1

5

1 Antenna RP-SMA Connector
2 RESET Button
3 RJ45 Ethernet Port, 10/100 LED, LINK/ACT LED

Figure 11. NI WSN-9791 Device Interface

Reset Button

The NI WSN-9791 is equipped with a reset button as shown in Figure 11.

Pressing the reset button results in the following device responses:

• When pressed for fewer than 5 seconds, the device reboots with the current configuration.

• When pressed for 5 seconds or more, the STATUS LED turns on. When released, the device reboots
into Factory Default Mode, which returns the device user configuration to the factory-set defaults.

Signal Strength/Status LED Indicators

The signal strength/status LED indicators for the NI WSN-9791 device are listed in Table 1.

NI WSN-9791

2

3

4

4 9–30 VDC Power Connector
5 LEDs: ACTIVITY, STATUS, and POWER

Table 1. LED State/Device Status

LED Description Color LED State Device Status

10/100 Green On Connected at 100 Mbps

Off No Ethernet connection or

10 Mbps connection

LINK/ACT Ye ll o w On Ethernet link

Off No Ethernet connection

Blinking Ethernet activity

POWER Green On Power on

Off Power off

© National Instruments Corporation 13 NI WSN-9791 User Guide and Specifications

Table 1. LED State/Device Status (Continued)

LED Description Color LED State Device Status

STATUS Yel l ow On Device firmware booting or resetting to

factory default

Off Normal operation

1 Blink Radio error

2 Blinks Firmware/FPGA image corrupted,

update firmware through NI MAX

3 Blinks Firmware error, reboot

ACTIVITY Green On Radio is active and sending or

receiving data

Off No radio activity

Using the NI WSN-9791

Firmware

The firmware is updated in NI MAX. To update the NI WSN-9791 Ethernet Gateway firmware,
complete the following steps:

1. Open NI MAX.

2. Select the NI WSN-9791 Ethernet Gateway for which you want to update firmware.

3. Click the Gateway Firmware tab.

4. Click Browse and select the firmware file.

5. Click Update Firmware.

6. Follow the prompt to reboot and apply changes.

For more information, refer to Start»All Programs»National Instruments»NI-WSN»Configuring
WSN in MAX.

Adding, Removing, and Replacing NI WSN-32xx Devices

Use NI MAX to add and remove nodes to and from your NI Wireless Sensor Network.You can remove
and insert NI WSN-32xx devices while the system is operating and without powering down the
NI WSN system. NI WSN-32xx devices already working in the system remain operational and
accessible on the network. Commands sent to a missing NI WSN-32xx device return an error response,
but the NI WSN-9791 stores the commands and applies the effects of the commands if a suitable
replacement is installed

When you remove a NI WSN-32xx device and add a new one, the NI WSN-9791 first verifies that the
replacement device is compatible with the one that was removed. If it is compatible, the NI WSN-9791
device configures the replacement NI WSN-32xx device with the previous device settings.

For more information, refer to Start»All Programs»National Instruments»NI-WSN»Configuring
WSN in MAX.

NI WSN-9791 User Guide and Specifications 14 ni.com

NI Wireless Sensor Networks

The NI WSN system is built on an IEEE 802.15.4 wireless mesh network. The 802.15.4 radio in each
NI WSN device provides for low-power communication of measurement data across a large network of
devices. The NI-WSN software builds on top of that to provide network configuration and reliable
communication from the host PC or PAC to the NI WSN-32xx node devices.

Mesh Networking

The NI WSN system consists of two types of devices: gateways and nodes. Gateways act as the network
coordinator, in charge of node authentication, message buffering, and bridging from the 802.15.4
wireless network to the wired Ethernet network. Nodes primarily function as end nodes in the network
to collect data and control DIO channels, but can also be programmed as routers to relay data from other
nodes back to the gateway and Host PC or PAC. Use NI MAX to configure nodes as end nodes or routers.
Figure 1 shows a typical NI Wireless Sensor Network.

The gateways and nodes work together to form a mesh network. The gateway maintains a list of nodes
(by serial number) that have been authorized for network access. When a node powers up, it scans for
available networks, locates either a gateway or router, and attempts to join it. If the gateway has the node
in its list, the node joins the network, downloads the latest configuration from the gateway, and begins
its normal operation of acquiring measurement data and controlling DIO.

© National Instruments Corporation 15 NI WSN-9791 User Guide and Specifications

Since each node joins a network instead of a particular router or gateway, it can find a new path back
to the gateway in the event that the signal is lost or blocked to its existing network route. In this way,
the mesh network is inherently self-forming and self-healing. However, this may also cause network
throughput to decrease, as there is no way to force a router or end node to join to a particular device in
the network. Each time a node joins through a router, the overall throughput of that node is halved, due
to the fact that the node must hop to get its messages back to the gateway. Figure 12 shows an example
of one possible mesh configuration.

R

1

G

R

2

Figure 12. Mesh Configuration Example

NI WSN-9791 User Guide and Specifications 16 ni.com

In this configuration, R1 (a router) and R2 (a router) both communicate directly with the gateway.
Measurements taken by both devices can directly reach the gateway without having to hop through
another node. However, the configuration above does not always mesh in the same way. Figure 13 shows
another possible configuration for the same network.

R

1

G

R

2

Figure 13. Same Network Configuration Example

© National Instruments Corporation 17 NI WSN-9791 User Guide and Specifications

In this configuration, R1 can still communicate with the gateway, but R2 is now connected through R1.

G

G

R

1

R

2

R

3

R

4

R

5

R

6

R

1

R

2

R

3

R

4

R

5

R

6

This means that all measurements taken by R2 must hop through R1 before making it back to the
gateway. In addition, R1 is now not only responsible for sending its own measurement data, but also

data. This configuration is considered a worst case 1-hop system, as R2 and R1 both have the

the R

2

possibility of meshing through a router that is connected to the gateway. National Instruments
recommends configuring your system for no more than three hops. Configuring multiple nodes as
routers and placing them within close proximity introduces the possibility that your system could mesh
inefficiently. Figure 14 shows how a system could mesh efficiently, yet also have the possibility of
meshing inefficiently.

Figure 14. Inefficient Versus Efficient Meshing

The network can be improved with two separate techniques:

1. Convert some routers to end nodes.

2. Set up the network to prevent the routers from being in range of each other (spatially separated by
distance, or introducing objects that increase radio interference such as buildings).

NI WSN-9791 User Guide and Specifications 18 ni.com

Another advantage of the mesh network is the ability to extend the distance of the end measurement
from the wired Ethernet gateway. By placing mesh routers throughout the space where you wish to
acquire signals, you can expand the area and distance across which measurement data can be acquired
and sent. Refer to the Specifications section for typical line of sight ranges for the NI WSN devices.
Figure 15 shows how a network can be set up to cover greater distances.

R

3

R

2

Figure 15. Network Containing Distance Example

R

1

G

End Node Versus Router

Each NI WSN-32xx node can be configured as either an end node or a router. NI WSN-32xx nodes are
configured by default at the factory in end node mode. You can change the mode of the node using
the NI-WSN software and NI MAX. One trade-off to consider when configuring nodes is power
consumption. NI WSN-32xx nodes configured as end node are designed to be run from battery power
while routers are designed to use external power at all times to send, receive, and buffer messages to and
from end nodes.

Data Transfer in the NI WSN Network

The NI WSN system is built on a low-power, reliable IEEE 802.15.4 network. In order to save power
and increase reliability, this network delivers a maximum theoretical throughput of 250 kbps. This
correlates to a typical maximum rate of 1 sample per second per node.

Measurements taken with NI WSN-32xx nodes are single point acquisition. NI WSN-32xx devices have
no onboard buffer, therefore the data is considered to be lost, meaning there is no way to retrieve past
data from the device.

© National Instruments Corporation 19 NI WSN-9791 User Guide and Specifications

Configuring Your NI WSN System

G

R

2

R

1

N

N

x 1

x 8

As discussed in the Mesh Networking section, creating a reliable and efficient wireless sensor network
requires an understanding of the physical environment the network will reside in, as well as an
understanding of the expected meshing configuration. Additionally, the following consideration needs
to be taken into account: parent devices (routers and gateways) can only have a maximum of eight end
nodes connected to them at a given time.

This introduces the stranded node problem. The stranded node problem exists when a node configured
as an end node has the possibility of not being able to join a device node. Figure 16 shows a network
consisting of one gateway, two routers, and nine end nodes.

Figure 16. Network Containing Distance, Example 1

NI WSN-9791 User Guide and Specifications 20 ni.com

In this case, all nodes have properly meshed, and all nodes can communicate with the gateway. However,

G

R

2

R

1

N

N

x 1

x 8

this network could potentially strand end nodes. Figure 17 shows another possible mesh of the same
network.

Figure 17. Network Containing Distance, Example 2

In this mesh configuration, eight end nodes in range of both R1 and R2 join with R1. This leaves one end
node stranded from the network. This can be corrected in the following two ways:

1. Move the set of 8 end nodes to where they can only communicate with R
possibly joining R

.

1

. This prevents them from

2

2. Add an additional router that is in range of the single end node. This introduces the possibility of
creating additional hops in the network, but also guarantees coverage of all end nodes.

© National Instruments Corporation 21 NI WSN-9791 User Guide and Specifications

Specifications

These specifications are typical at 25 °C unless otherwise noted. For the NI WSN-32xx specifications,
refer to the device user guides.

Wireless Characteristics

Radio mode ............................................................IEEE 802.15.4

RF data rate............................................................250 kbits/s

1

Frequency band

Channels

TX power

Modulation type.............................................DSSS (O-QPSK)

Receiver sensitivity........................................–102 dBm

Antenna

Connector.......................................................Female RP-SMA connector

VSWR............................................................MAX 2.0

Impedance......................................................50 Ω

Directivity ......................................................Omni

Nominal gain..........................................................1.5 dBi

....................................................ISM 2.4 GHz (2400 MHz to 2483.5 MHz)

2

...............................................................11–24

Ve rs i on Maximum Radio Output Outdoor Range

Americas +17 dBm max (50 mW) Up to 300 m

Europe/Asia +10 dBm max (10 mW) Up to 150 m

Ethernet

Network interface...................................................100 BASE-TX, full-duplex;

100 BASE-TX, half-duplex;
10 BASE-T, full-duplex;
10 BASE-T, half-duplex

Network protocols..................................................TCP/IP, UDP

Network IP configuration ......................................DHCP + Link-Local, Static

Communication rates .............................................10/100 Mbits/s, auto-negotiated

Maximum cabling distance....................................100 m/segment

1

Due to regulations, the frequency bands depend upon the country of operation.

2

Due to regulations, the valid channels depend upon country of operation.

NI WSN-9791 User Guide and Specifications 22 ni.com

Power Requirements

Caution You must use a UL Listed ITE power supply marked LPS with the NI WSN-9791. The

power supply must also meet any safety and compliance requirements for the country of use.

Input voltage range ................................................9 to 30 V

Maximum required input power ............................4.5 W

Power input mating connector ...............................2 position mini-combicon,

Note For EMC compliance, operate this device with shielded cables. The NI WSN-9791 is

guaranteed to power up when 9 V is applied to V and C. After power up, it can operate on as little
as 6 V.

Physical Characteristics

Weight ....................................................................Approx. 250 g (8.8 oz)

Weight with antenna .............................................Approx. 259 g (9.1 oz)

Dimensions ............................................................Refer to Figure 3 for device dimensions

Safety Standards

Note For UL and other safety certifications, refer to the product label, or go to ni.com/

certification

Certification column.

The NI WSN-9791 is designed to meet the requirements of the following standards of safety for
electrical equipment for measurement, control, and laboratory use:

• IEC 61010-1, EN 61010-1

• UL 61010-1, CSA 61010-1

Phoenix Contact part number: 1714977

, search by model number or product line, and click the appropriate link in the

Hazardous Locations

U.S. (UL) ...............................................................Class I, Division 2, Groups A, B, C, D, T4;

Class I, Zone 2, AEx nC IIC T4

Canada (C-UL) ......................................................Class I, Division 2, Groups A, B, C, D, T4;

Class I, Zone 2, Ex nL IIC T4

Europe (DEMKO)..................................................Ex nA nL IIC T4

Safety Voltages

Connect only voltages that are within these limits.

V terminal to C terminal ........................................ 30 V max, Measurement Category I

Measurement Category I is for measurements performed on circuits not directly connected to the
electrical distribution system referred to as MAINS voltage. MAINS is a hazardous live electrical supply
system that powers equipment. This category is for measurements of voltages from specially protected
secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy
parts of equipment, circuits powered by regulated low-voltage sources, and electronics.

Caution Do not connect the system to signals or use for measurements within Measurement

Categories II, III, or IV.

© National Instruments Corporation 23 NI WSN-9791 User Guide and Specifications

RF Safety Warning

This product complies with FCC radiation exposure limits set for uncontrolled equipment and meets the
FCC radio frequency (RF) Exposure Guidelines in Supplement C to OET65. This product generates and
radiates radio frequency energy. To comply with the radio frequency radiation exposure guidelines in an
uncontrolled environment, this equipment should be installed and operated with at least 20 cm between
the radiator and the person’s body (excluding extremities: hands, wrists, feet, and legs).

This product complies with the European Council Recommendation (1995/519/EC) on the limitation of
exposure of the general public to electromagnetic fields. Compliance was determined in accordance
with the requirements in EN 50371.

Electromagnetic Compatibility

This product is designed to meet the requirements of the following standards of EMC for electrical
equipment for measurement, control, and laboratory use:

• EN 61326-1 (IEC 61326-1): Class A emissions; Basic immunity

• EN 55011 (CISPR 11): Group 1, Class A emissions

• AS/NZS CISPR 11: Group 1, Class A emissions

• FCC 47 CFR Part 15B: Class A emissions

• ICES-001: Class A emissions

This product also meets the requirements of the following EMC standards for intentional radiators:

• EN 300 328

• EN 301 489-1 and EN 301 489-17

• FCC 47 CFR Part 15C

• IC RSS-210

Note For EMC certification and additional information, refer to the product label or the EU

Regulatory Statements section.

CE Compliance

This product meets the essential requirements of applicable European Directives as follows:

• 2006/95/EC; Low-Voltage Directive (safety)

• 2004/108/EC; Electromagnetic Compatibility Directive (EMC)

• 1999/5/EC; Radio and Telecommunications Terminal Equipment (R&TTE) Directive

Regulatory Information

United States

This product complies with Part 15 of the FCC Rules. Operation is subject to these two conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.

Canada

This product complies with Industry Canada RSS-210.

Cet appareil est conforme aux norme RSS210 d’Industrie Canada.

NI WSN-9791 User Guide and Specifications 24 ni.com

Europe—EU Declaration of Conformity

Marking by the above CE symbol on the label indicates compliance with the Essential Requirements of
the R&TTE Directive of the European Union (1999/5/EC). This equipment meets the following
conformance standards: EN 300 893, EN300 328, EN301 489-17, EN60950.

Europe – Restrictions for Use of 2.4 GHz Frequencies in European Community Countries

België/

Belgique:

Deutschland: License required for outdoor installations. Check with reseller for procedure to follow.

France: Restricted frequency band: only channels 1 to 7 (2400 MHz and 2454 MHz respectively) may be used

Italia: License required for indoor use. Use with outdoor installations not allowed.

Nederland: License required for outdoor installations. Check with reseller for procedure to follow.

For private usage outside buildings across public grounds over less than 300 m no special registration
with IBPT/BIPT is required. Registration to IBPT/BIPT is required for private usage outside buildings
across public grounds over more than 300 m. For registration and license please contact IBPT/BIPT.

Voor privé-gebruik buiten gebouw over publieke groud over afstand kleiner dan 300 m geen registratie
bij BIPT/IBPT nodig; voor gebruik over afstand groter dan 300 m is wel registratie bij BIPT/IBPT
nodig. Voor registratie of licentie kunt u contact opnemen met BIPT.

Dans le cas d’une utilisation privée, à l’extérieur d’un bâtiment, au-dessus d’un espace public, aucun
enregistrement n’est nécessaire pour une distance de moins de 300 m. Pour une distance supérieure à
300 m un enregistrement auprès de I’IBPT est requise. Pour les enregistrements et licences, veuillez
contacter I’IBPT.

Anmeldung im Outdoor-Bereich notwendig, aber nicht genehmigungspflichtig.Bitte mit Händler die
Vorgehensweise abstimmen.

outdoors in France.

Bande de fréquence restreinte : seuls les canaux 1–7 (2400 et 2454 MHz respectivement) doivent être
utilisés endroits extérieur en France. Vous pouvez contacter I’Autorité de Régulation des
Télécommuniations (http://www.art-telecom.fr) pour la procédure à suivre.

E'necessaria la concessione ministeriale anche per l’uso interno.

Verificare con i rivenditori la procedura da seguire.

Licentie verplicht voor gebruik met buitenantennes. Neem contact op met verkoper voor juiste
procedure.

Japan

The certified radio equipment is embedded in this device.

本機器には認証済み無線設備が内蔵されています

Singapore

Complies with
IDA Standards

DA105692

© National Instruments Corporation 25 NI WSN-9791 User Guide and Specifications

Taiwan R.O.C.

低功率電波輻射性電機管理辦法
第十二條經型式認證合格之低功率射頻電機，非經許可，公司、商號或使
用者均不得擅自變更頻率、加大功率或變更原設計之特性及功能。
第十四條低功率射頻電機之使用不得影響飛航安全及幹擾合法通信；經發
現有幹擾現象時，應立即停用，並改善至無幹擾時方得繼續使用。
前項合法通信，指依電信規定作業之無線電信。低功率射頻電機須忍受合法通信
或工業、科學及醫療用電波輻射性電機設備之幹擾。

EU Regulatory Statements

Česky
[Czech]

Dansk
[Danish]

Deutsch
[German]

Eesti
[Estonian]

English Hereby, National Instruments, declares that this NI WSN-9791 is in compliance with the

Español
[Spanish]

Ελληνική
[Greek]

Français
[French]

Italiano
[Italian]

Latviski
[Latvian]

Lietuvių
[Lithuanian]

Nederlands
[Dutch]

Malti
[Maltese]

Magyar
[Hungarian]

National Instruments tímto prohlašuje, _e tento NI WSN-9791 je ve shodě se základními
po_adavky a dalšími příslušnými ustanoveními směrnice 1999/5/ES.

Undertegnede National Instruments erklćrer herved, at fřlgende udstyr NI WSN-9791
overholder de vćsentlige krav og řvrige relevante krav i direktiv 1999/5/EF.

Hiermit erklärt National Instruments, dass sich das Gerät NI WSN-9791 in
Übereinstimmung mit den grundlegenden Anforderungen und den übrigen einschlägigen
Bestimmungen der Richtlinie 1999/5/EG befindet.

Käesolevaga kinnitabNational Instruments seadme NI WSN-9791 vastavust direktiivi
1999/5/EÜ põhinõuetele ja nimetatud direktiivist tulenevatele teistele asjakohastele
sätetele.

essential requirements and other relevant provisions of Directive 1999/5/EC.

Por medio de la presente National Instruments declara que el NI WSN-9791 cumple con
los requisitos esenciales y cualesquiera otras disposiciones aplicables o exigibles de la
Directiva 1999/5/CE.

ΜΕ ΤΗΝ ΠΑΡΟΥΣΑ National Instruments ΔΗΛΩΝΕΙ ΟΤΙ NI WSN-9791WSN-9791
ΣΥΜΜΟΡΦΩΝΕΤΑΙ ΠΡΟΣ ΤΙΣ ΟΥΣΙΩΔΕΙΣ ΑΠΑΙΤΗΣΕΙΣ ΚΑΙ ΤΙΣ ΛΟΙΠΕΣ ΣΧΕΤΙΚΕΣ
ΔΙΑΤΑΞΕΙΣ ΤΗΣ ΟΔΗΓΙΑΣ 1999/5/ΕΚ.

Par la présente National Instruments déclare que l'appareil NI WSN-9791 est conforme
aux exigences essentielles et aux autres dispositions pertinentes de la directive
1999/5/CE.

Con la presente National Instruments dichiara che questo NI WSN-9791 è conforme ai
requisiti essenziali ed alle altre disposizioni pertinenti stabilite dalla direttiva 1999/5/CE.

Ar šo National Instruments deklarē, ka NI WSN-9791 atbilst Direktīvas 1999/5/EK
būtiskajām prasībām un citiem ar to saistītajiem noteikumiem.

Šiuo National Instruments deklaruoja, kad šis NI WSN-9791 atitinka esminius reikalavimus
ir kitas 1999/5/EB Direktyvos nuostatas.

Hierbij verklaart National Instruments dat het toestel NI WSN-9791 in overeenstemming is
met de essentiële eisen en de andere relevante bepalingen van richtlijn 1999/5/EG.

Hawnhekk, National Instruments, jiddikjara li dan NI WSN-9791 jikkonforma mal-htigijiet
essenzjali u ma provvedimenti ohrajn relevanti li hemm fid-Dirrettiva 1999/5/EC.

Alulírott, National Instruments nyilatkozom, hogy a NI WSN-9791 megfelel a vonatkozó
alapvetõ követelményeknek és az 1999/5/EC irányelv egyéb elõírásainak.

NI WSN-9791 User Guide and Specifications 26 ni.com

Polski
[Polish]

Português
[Portuguese]

Slovensko
[Slovenian]

Slovensky
[Slovak]

Suomi
[Finnish]

Svenska
[Swedish]

Íslenska
[Icelandic]

Norsk
[Norwegian]

Environmental

Operating temperature

(IEC-60068-2-1 and IEC-60068-2-2) ....................–30 to 70 °C

Storage temperature

(IEC-60068-2-1 and IEC-60068-2-2) ....................– 40 to 70 °C

Operating humidity (IEC-60068-2-56)..................10 to 90% RH, noncondensing

Storage humidity (IEC-60068-2-56)......................5 to 90% RH, noncondensing

Niniejszym National Instruments. oświadcza, że NI WSN-9791 jest zgodny z zasadniczymi
wymogami oraz pozostałymi stosownymi postanowieniami Dyrektywy 1999/5/EC.

National Instruments declara que este NI WSN-9791 está conforme com os requisitos
essenciais e outras disposições da Directiva 1999/5/CE.

National Instruments izjavlja, da je ta NI WSN-9791 v skladu z bistvenimi zahtevami in
ostalimi relevantnimi določili direktive 1999/5/ES.

National Instruments týmto vyhlasuje, _e NI WSN-9791 spĺňa základné po_iadavky a
všetky príslušné ustanovenia Smernice 1999/5/ES.

National Instruments vakuuttaa täten että NI WSN-9791 tyyppinen laite on direktiivin
1999/5/EY oleellisten vaatimusten ja sitä koskevien direktiivin muiden ehtojen mukainen.

Härmed intygar National Instruments att denna NI WSN-9791 står I överensstämmelse
med de väsentliga egenskapskrav och övriga relevanta bestämmelser som framgår av
direktiv 1999/5/EG.

Hér með lýsir National Instruments yfir því að NI WSN-9791 er í samræmi við grunnkröfur
og aðrar kröfur, sem gerðar eru í tilskipun 1999/5/EC.

National Instruments erklærer herved at utstyret NI WSN-9791 er i samsvar med de
grunnleggende krav og øvrige relevante krav i direktiv 1999/5/EF.

Pollution Degree (IEC 60664) ...............................2, indoor use only

Maximum altitude..................................................2,000 m

Indoor use only

Online Product Certification

Note Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance

information. To obtain product certifications and the DoC for this product, visit ni.com/

certification

, search by model number or product line, and click the appropriate link in the

Certification column.

Shock and Vibration

Operating vibration, random..................................5 g

Operating shock ..................................................... 30 g, 11 ms half sine,

Operating vibration, sinusoidal..............................5 g, 10 to 500 Hz (IEC 60068-2-6)

© National Instruments Corporation 27 NI WSN-9791 User Guide and Specifications

, 10 to 500 Hz (IEC 60068-2-64)

rms

50 g, 3 ms half sine,
18 shocks at 6 orientations (IEC 60068-2-27)

Environmental Management

⬉ᄤֵᙃѻક∵ᶧ᥻ࠊㅵ⧚ࡲ⊩ ˄Ё೑

RoHS

˅

Ё೑ᅶ᠋

National Instruments

ヺড়Ё೑⬉ᄤֵᙃѻકЁ䰤ࠊՓ⫼ᶤѯ᳝ᆇ⠽䋼ᣛҸ

(RoHS)

DŽ

݇Ѣ

National InstrumentsЁ೑RoHS

ড়㾘ᗻֵᙃˈ䇋ⱏᔩ

ni.com/environment/rohs_china

DŽ

(For information about China RoHS compliance, go to

ni.com/environment/rohs_china

.)

National Instruments is committed to designing and manufacturing products in an environmentally
responsible manner. NI recognizes that eliminating certain hazardous substances from our products is
beneficial not only to the environment but also to NI customers.

For additional environmental information, refer to the NI and the Environment Web page at

environment

. This page contains the environmental regulations and directives with which NI

ni.com/

complies, as well as other environmental information not included in this document.

Waste Electrical and Electronic Equipment (WEEE)

EU Customers At the end of the product life cycle, all products must be sent to a WEEE recycling

center. For more information about WEEE recycling centers, National Instruments WEEE initiatives,
and compliance with WEEE Directive 2002/96/EC on Waste and Electronic Equipment,

ni.com/environment/weee.

visit

NI WSN-9791 User Guide and Specifications 28 ni.com

Where to Go for Support

National Instruments corporate headquarters is located at 11500 North Mopac Expressway, Austin,
Texas, 78759-3504. National Instruments also has offices located around the world to help address
your support needs. For telephone support in the United States, create your service request at

ni.com/support and follow the calling instructions or dial 512 795 8248. For telephone support

outside the United States, contact your local branch office:

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Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151, Taiwan 886 02 2377 2222,
Thailand 662 278 6777, Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545

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372777D-01 Nov10