National Instruments USRP-2940 User manual

USRP-2940/2942/2943/2944/2945
Getting Started
2022-07-11

Contents
USRP RIO device Getting Started Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Verifying the System Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Unpacking the Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Verifying the Kit Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Environmental Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Environmental Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installing the Soware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installing the Soware Using NI Package Manager. . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installing the Soware Using the Driver Download Page. . . . . . . . . . . . . . . . . . . . 8
Installing the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Powering on the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Synchronizing Multiple Devices (Optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Preparing the USRP-2945 for LO Sharing (Optional). . . . . . . . . . . . . . . . . . . . . . . 11
Preparing the USRP-2945 for LO Re-Import (Optional). . . . . . . . . . . . . . . . . . . . . 12
Programming the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
NI-USRP Instrument Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Verifying the Device Connection (Optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Why Doesn't the Device Power On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Why Doesn't the USRP Device Appear in the NI-USRP Configuration Utility?. . 18
Why Does USRP2 Appear Instead of the USRP Device in the NI-USRP
Configuration Utility?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Should I Update Device Firmware and FPGA Images?. . . . . . . . . . . . . . . . . . . . . . 18
Why Do I Receive an Enumeration Error?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Why Don't NI-USRP Examples Appear in the NI Example Finder in LabVIEW?. 19
Front Panels, Back Panels, and Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Direct Connections to the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
USRP-2940 Front Panel, Back Panel, and LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
USRP-2942 Front Panel, Back Panel, and LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
USRP-2943 Front Panel, Back Panel, and LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
USRP-2944 Front Panel, Back Panel, and LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
USRP-2945 Front Panel, Back Panel, and LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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USRP-2940/2942/2943/2944/2945 Getting Started

GPIO Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Where to Go Next. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
© National Instruments 3
USRP-2940/2942/2943/2944/2945 Getting Started

USRP RIO device Getting Started Guide
This document explains how to install, configure, and test the following USRP RIO
devices:
■ USRP-2940 Soware Defined Radio Reconfigurable Device
■ USRP-2942 Soware Defined Radio Reconfigurable Device
■ USRP-2943 Soware Defined Radio Reconfigurable Device
■ USRP-2944 Soware Defined Radio Reconfigurable Device
■ USRP-2945 Soware Defined Radio Reconfigurable Device
The USRP RIO device can send and/or receive signals for use in various
communications applications. The device ships with the NI-USRP instrument driver,
which you can use to program the device.
Verifying the System Requirements
To use the NI-USRP instrument driver, your system must meet certain requirements.
Refer to the product readme, which is available online on the driver soware
download page or at ni.com/manuals, for more information about minimum system
requirements, recommended system, and supported application development
environments (ADEs).
Unpacking the Kit
Notice To prevent electrostatic discharge (ESD) from damaging the
device, ground yourself using a grounding strap or by holding a grounded
object, such as your computer chassis.
1. Touch the antistatic package to a metal part of the computer chassis.
2. Remove the device from the package and inspect the device for loose
components or any other sign of damage.
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USRP-2940/2942/2943/2944/2945 Getting Started

Notice Never touch the exposed pins of connectors.
Note Do not install a device if it appears damaged in any way.
3. Unpack any other items and documentation from the kit.
Store the device in the antistatic package when the device is not in use.
Verifying the Kit Contents
Figure 1. Kit Contents
LINK PWR
TX OUTPUT MAX +20 dBm, RX INPUT MAX -15 dBm, ALL RF PORTS 50 W
TX1 RX1 RX2
GPS
PPS
REF
TX1 RX1 RX2
AUX I/O
3.3 VDC MAX
RF 0 RF 1
NI USRP-2943R
1.2 GHz - 6 GHz
NI USRP-2943R
1.2 GHz - 6 GHz
Designed by Ettus ResearchDesigned by Ettus Research
JTAG
1
54
3
2
1. USRP RIO Device
2. SMA Driver Bit (USRP-2945 Only)
3. Getting Started Guide (This Document) and Safety, Environmental, and
Regulatory Information Document
4. SMA (m)-to-SMA (m) Cable
5. 30 dB SMA Attenuator (Not Included with USRP-2945)
Notice If you directly connect or cable a signal generator to your device,
or if you connect multiple devices together, you must connect a 30 dB
attenuator to the RF input (RX1 or RX2) of each receiving USRP RIO device.
© National Instruments 5
USRP-2940/2942/2943/2944/2945 Getting Started

Other Required Item(s)
In addition to the kit contents, you must provide the following additional item(s):
■An MXI Express interface card. You can purchase an MXI Express interface kit
for your USRP RIO device, which contains an MXI Express interface card, at
ni.com.
Optional Items
■ LabVIEW Modulation Toolkit (MT), available for download at ni.com/
downloads and included in LabVIEW Communications System Design Suite,
which includes MT VIs and functions, examples, and documentation
Note You must install the LabVIEW Modulation Toolkit for proper
operation of the NI-USRP Modulation Toolkit example VIs.
■ LabVIEW Digital Filter Design Toolkit, available for download at ni.com/
downloads and included in LabVIEW Communications System Design Suite
■ LabVIEW MathScript RT Module, available for download at ni.com/
downloads
■Additional SMA (m)-to-SMA (m) cables to use the REF IN and PPS IN signals
■ PCIe - MXI Express Interface Kit for USRP RIO to connect to a desktop
computer
■ ExpressCard Slot - MXI Express Interface Kit for USRP RIO to connect to a
laptop computer
■ PXIe - MXI Express Interface Kit for USRP RIO to connect to a PXI Express
chassis
■ CDA-2990 Clock Distribution Device for synchronizing multiple devices
■ CPS-8910 Switch Device for PCI Express for large multiple-input, multiple-
output (MIMO) expansion configurations
■ PXI-5691 RF Amplifier for local oscillator (LO) re-import with the USRP-2945
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USRP-2940/2942/2943/2944/2945 Getting Started

Environmental Guidelines
Notice This model is intended for use in indoor applications only.
Environmental Characteristics
Operating temperature 0 °C to 45 °C
Operating humidity 10% to 90% relative humidity, noncondensing
Pollution Degree 2
Maximum altitude 2,000 m (800 mbar) (at 25 °C ambient temperature)
Installing the Soware
You must be an Administrator to install NI soware on your computer.
1. Install an application development environment (ADE), such as LabVIEW or
LabVIEW Communications System Design Suite.
2. Follow the instructions below that correspond with the ADE that you installed.
Installing the Soware Using NI Package Manager
Ensure that you have installed the latest version of NI Package Manager. To access
the download page for NI Package Manager, go to ni.com/info and enter info code
NIPMDownload.
Note NI-USRP versions 18.1 to current are available to download using NI
Package Manager. To download another version of NI-USRP, refer to
Installing the Soware Using the Driver Download Page.
1. To install the latest NI-USRP instrument driver, open NI Package Manager.
2. On the BROWSE PRODUCTS tab, click Drivers to display all available drivers.
© National Instruments 7
USRP-2940/2942/2943/2944/2945 Getting Started

3. Select NI-USRP and click INSTALL.
4. Follow the instructions in the installation prompts.
Note Windows users may see access and security messages during
installation. Accept the prompts to complete the installation.
Related information
■Install NXG
Installing the Soware Using the Driver Download Page
Note NI recommends using NI Package Manager to download NI-USRP
driver soware.
1. Visit ni.com/info and enter the Info Code usrpdriver to access the driver
download page for all versions of NI-USRP soware.
2. Download a version of NI-USRP driver soware.
3. Follow the instructions in the installation prompts.
Note Windows users may see access and security messages during
installation. Accept the prompts to complete the installation.
4. When the installer completes, select Shut Down in the dialog box that
prompts you to restart, shut down, or restart later.
Installing the Device
Install all the soware you plan to use before you install the hardware. Ensure that
the USRP RIO device and computer are o before installing.
Connect any additional attachments required for your project to the front panel
terminals of the USRP RIO device.
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USRP-2940/2942/2943/2944/2945 Getting Started

Connecting the Device
The USRP RIO device must be connected either to a desktop computer or a laptop
computer.
Notice Never turn the USRP RIO device o or on while the computer is on.
Connecting to a Desktop Computer
Connect the USRP RIO device to a desktop computer using an MXI Express interface
kit.
1. Insert the MXI card into your computer according to the installation
instructions in the Hardware Installation section of the Set Up Your MXI™
Express ×4 System document included in your MXI Express interface kit.
2. Connect the MXI device to the USRP RIO device using the PCIe cable included
in your MXI Express interface kit.
Connecting to a Laptop Computer
Connect the USRP RIO device to a laptop computer using the ExpressCard-8360 for
USRP Device for PXI Remote Control.
1. Touch the ExpressCard-8360 for USRP and outer metal case of the USRP RIO
device simultaneously.
2. Connect the included cable to the to the ExpressCard-8360 for USRP.
3. Plug the ExpressCard-8360 for USRP into an available ExpressCard slot.
The completed hardware setup is shown in the following figure.
© National Instruments 9
USRP-2940/2942/2943/2944/2945 Getting Started

Figure 2. Connecting the Device with a Laptop Connectivity Kit
NI ExpressCard-8360
INSERT CARD
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1
3
4
1. Cable Included with ExpressCard Interface Kit
2. ExpressCard-8360 for USRP
3. ExpressCard Slot
4. Laptop Computer
Powering on the Device
1. Connect the power supply to the USRP RIO device.
2. Plug the power supply into a wall outlet. Press the power button on the front
of your device.
3. Power on the chassis and network switch.
Synchronizing Multiple Devices (Optional)
To set up a higher channel-count system, you can synchronize two or more USRP
RIO devices so that they share clock and pulse per second (PPS) signals.
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Note Synchronizing multiple USRP RIO devices requires a CDA-2990
accessory.
Ensure that all hardware is set up as previously described.
1. Connect the REF IN port of the USRP RIO device to the first 10 MHz OUT port of
the CDA-2990 using a standard SMA (m)-to-SMA (m) cable.
2. Connect the PPS TRIG IN port of the USRP RIO device to the PPS OUT port of
the CDA-2990 using a standard SMA (m)-to-SMA (m) cable.
3. Repeat steps 1 and 2 to synchronize additional USRP RIO devices using the
additional ports on the CDA-2990 (optional).
The completed hardware setup for two USRP RIO devices is shown in the
following figure.
Figure 3. USRP Device Synchronization Configuration
2
CDA-2990
Designed by Ettus ResearchDesigned by Ettus Research 3 4 5 621 78 7 83 4 5 621
PPS OUT10 MHz OUT PPS OUT
POWER
GPS LOCK
PPS
STATUS
EXTERNAL
INTERNAL
ETHERNET GPS ANT
INPUT
PRIMARY REF
INTERNAL
EXTERNAL
EXT 10 MHz
INPUT
EXT PPS
INPUT POWER
8 Channel Clock Distribution Module
6 – 15 V
6 W MAX
0 1
PWR REF
IN
PPS
OUT
TRIG
5V DC
REF
OUT
1G/10G ETH
3.3 V +15 dBm
MAX
9-16V DC
7.5 A MAX
SFP+Ports
PCIe x4
TRIG
3.3V
IN
5V MAX
PPS GPS
ANT
–15 dBm
MAX
0 1
PWR REF
IN
PPS
OUT
TRIG
5V DC
REF
OUT
1G/10G ETH
3.3 V +15 dBm
MAX
9-16V DC
7.5 A MAX
SFP+Ports
PCIe x4
TRIG
3.3V
IN
5V MAX
PPS GPS
ANT
–15 dBm
MAX
1
1. SMA (m)-to-SMA (m) Cables
2. SMA (m)-to-SMA (m) Cables
Preparing the USRP-2945 for LO Sharing (Optional)
Complete the following steps to prepare a single USRP-2945 device to share LOs
among all four of the device's channels.
© National Instruments 11
USRP-2940/2942/2943/2944/2945 Getting Started

1. Connect the LO OUT 1 IF2 connector of the USRP-2945 back panel to the
LO IN 0 IF2 connector of the same USRP-2945 back panel using an SMA (m)-to-
SMA (m) cable.
2. Connect the LO OUT 1 IF1 connector of the USRP-2945 back panel to the
LO IN 0 IF1 connector of the same USRP-2945 back panel using an SMA (m)-to-
SMA (m) cable.
The completed hardware setup is shown in the following figure.
Figure 4. USRP-2945 Single Device LO Sharing
0 1
PWR 1G/10G ETH
9-16V DC
7.5 A MAX
SFP+Ports
1
1. SMA(m)-to-SMA(m) Cables
Preparing the USRP-2945 for LO Re-Import (Optional)
Complete the following steps to prepare a single USRP-2945 device to export
LO OUT 1 and re-import to LO IN 1 and LO IN 0.
1. Connect the LO OUT 1 IF2 connector of the USRP-2945 back panel to the IN
connector of an RF power amplifier front panel using an SMA (m)-to-SMA (m)
cable.
2. Connect the OUT connector of the RF power amplifier to the input port of a
two-way RF power splitter using an SMA (m)-to-SMA (m) cable.
3. Connect the two output ports of the RF power splitter front panel to the
LO IN 0 IF2 and LO IN 1 IF2 connectors of the USRP-2945 back panel using SMA
(m)-to-SMA (m) cables.
4. Repeat steps 1 through 3 using a second splitter and additional cables to re-
import and share the IF1 signal.
The completed hardware setup is shown in the following figure.
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USRP-2940/2942/2943/2944/2945 Getting Started

Figure 5. LO Re-Import Configuration
ACCESS
ACTIVE
CH 0
IN
+30 dBm
MAX
50 Ω
IN
OUT
+30 dBm
MAX
50 Ω
50 Ω
OUT
50 Ω
CH 1
50 MHz - 8 GHz
NI PXI-5691
RF Amplifier
0 1
PWR 1G/10G ETH
9-16V DC
7.5 A MAX
SFP+Ports
IF1IF2IF1IF2IF1IF2
2
1
4
3
1. RF Power Amplifier
2. USRP RIO Device
3. RF Power Splitters
4. SMA (m)-to-SMA (m) Cables
Programming the Device
You can use the NI-USRP instrument driver to create communications applications
for the USRP RIO device.
USRP RIO devices are LabVIEW FPGA targets, which support creating custom FPGAs
and configuring the device using Instrument Design Libraries (IDLs).
Note You must use the PCIe x4 connector if you want to program the
FPGA. You cannot use the 1G/10G ETH connector to program the FPGA.
© National Instruments 13
USRP-2940/2942/2943/2944/2945 Getting Started

NI-USRP Instrument Driver
The NI-USRP instrument driver features a set of functions and properties that
exercise the capabilities of the USRP RIO device, including configuration, control,
and other device-specific functions.
Related concepts
■Refer to the NI-USRP Manual for information about using the instrument
driver in your applications.
Soware Options
NI provides two soware options for programming the USRP RIO device: the NI-
USRP API and the USRP RIO IDL.
Note You cannot use the USRP RIO IDLs with the NI-USRP API.
Soware
Option
Description Use Case Palette Location
NI-USRP
API
Provides an API for
interacting with your USRP
RIO device.
Provides the standard,
CPU-based host operation
needed for most soware-
defined radio (SDR)
applications.
Create custom
measurements or
applications that require
in-phase/quadrature
modulation (I/Q) data.
Use with the Modulation
Toolkit to develop SDR
transmitters and
receivers.
Use with the Modulation
Toolkit to create and
generate modulated
signals.
LabVIEW NXG and
LabVIEW Communications
System Design Suite: Diagram »
Hardware Interfaces » Wireless
Design and Test » NI-USRP
LabVIEW: Functions »
Instrument I/O » Instrument
Drivers » NI-USRP
USRP RIO
IDL
Allows you to interface with
the FPGA of your USRP RIO
device for advanced
programming and digital
signal processing (DSP).
Use with the LabVIEW
FPGA Module to
customize the behavior
of the device FPGA to
create application-
specific instrument
designs.
LabVIEW NXG and LabVIEW
Communications System
Design Suite: Diagram »
Hardware Interfaces » Wireless
Design and Test » USRP RIO
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USRP-2940/2942/2943/2944/2945 Getting Started

Soware
Option
Description Use Case Palette Location
Uses the USRP RIO Sample
Projects, which allow you
to take common
measurements with your
device. USRP RIO Sample
Projects are included in the
installation.
LabVIEW: Functions »
Instrument I/O » Instrument
Drivers » USRP RIO
Table 1. Soware Options
NI-USRP Examples, Lessons, and Sample Projects
NI-USRP includes several examples, lessons, and sample projects for LabVIEW,
LabVIEW NXG, and LabVIEW Communications System Design Suite. They can be
used individually or as components of other applications.
NI-USRP examples, lessons, and sample projects are available in the following
locations.
Content
Type
Description LabVIEW LabVIEW NXG or
LabVIEW Communications System Design Suite
Examples NI-USRP includes
several example
applications that
serve as interactive
tools, programming
models, and building
blocks in your own
applications. NI-USRP
includes examples for
getting started and
other soware-
defined radio (SDR)
functionality.
Note You
can access
additional
examples
from the
■From the
Start menu
at Start »
All
Programs »
National
Instruments
» NI-
USRP »
Examples.
■From the
LabVIEW
Functions
palette at
Instrument
I/O »
Instrument
■From the Learning tab, select
Examples » Hardware Input and Output »
NI-USRP.
■From the Learning tab, select
Examples » Hardware Input and Output »
NI USRP RIO.
© National Instruments 15
USRP-2940/2942/2943/2944/2945 Getting Started

Content
Type
Description LabVIEW LabVIEW NXG or
LabVIEW Communications System Design Suite
Code
Sharing
Community
at ni.com/
usrp.
Drivers »
NI-USRP »
Examples.
Lessons NI-USRP includes
lessons that guide you
through the process of
identifying and
demodulating an FM
signal with your
device.
N/A From the Learning tab, select Lessons » Getting
Started » Demodulating FM Signals with the
NI... and choose a task to accomplish.
Sample
Projects
USRP RIO includes
several sample
projects that serve as
starting points to build
a USRP RIO streaming
application.
From the Create
Project dialog,
select Sample
Projects in the
le pane and
navigate to the
NI-USRP Simple
Streaming
project.
From the Projects tab, select USRP RIO and
choose the applicable sample project for your
device and setup.
Note The NI Example Finder does not include NI-USRP examples.
Verifying the Device Connection (Optional)
Complete the steps appropriate for your installed ADE to verify the device
connection.
Verifying the Device Connection Using LabVIEW NXG or LabVIEW
Communications System Design Suite 2.1 to Current
Use USRP Rx Continuous Async to confirm that the device receives signals and is
connected correctly to the host computer.
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USRP-2940/2942/2943/2944/2945 Getting Started

1. Navigate to Learning » Examples » Hardware Input and Output » NI-USRP » NI-
USRP.
2. Select Rx Continuous Async. Click Create.
3. Run USRP Rx Continuous Async.
If the device is receiving signals you will see data on the front panel graphs.
4. Click STOP to conclude the test.
Verifying the Device Connection Using LabVIEW
Run a VI to confirm that the device transmits and/or receives signals and is
connected correctly to the host computer.
1. Create a sample project in LabVIEW by selecting File » Create Project »
NI-USRP.
2. Select the NI-USRP Simple Streaming sample project template and click Next.
3. Run the appropriate streaming VI according to your USRP RIO device.
Device VI
USRP-2940/2942/2943/2944 Tx and Rx Streaming Host VI
USRP-2945 Rx Streaming (Host) VI
If the device is transmitting and/or receiving signals, the front panel graphs
display waveform data.
4. Click STOP to conclude the test.
Troubleshooting
If an issue persists aer you complete a troubleshooting procedure, search our
KnowledgeBase for additional information our technical support engineers create
as they answer common user questions and resolve unexpected issues.
Why Doesn't the Device Power On?
If you cannot power on the device, complete the following steps.
■Verify that the device is connected to the power supply.
■Verify that the power supply is functional.
© National Instruments 17
USRP-2940/2942/2943/2944/2945 Getting Started

■Verify that the power switch on the front of the device is engaged.
Why Doesn't the USRP Device Appear in the NI-USRP Configuration
Utility?
Check the connection between the USRP RIO device and the computer. Ensure that
the USRP RIO device is powered on and connected to a computer before you power
on the computer.
Why Does USRP2 Appear Instead of the USRP Device in the NI-USRP
Configuration Utility?
■An incorrect IP address on the computer may cause this error. Check the IP
address and run the NI-USRP Configuration Utility again.
■An old FPGA or firmware image on the device may also cause this error.
Upgrade the FPGA and firmware using the NI-USRP Configuration Utility.
Should I Update Device Firmware and FPGA Images?
Your device ships with firmware and FPGA images compatible with the NI-USRP
driver soware. You may need to update the device for compatibility with the latest
version of the soware.
The driver soware media also includes the NI-USRP Configuration Utility, which
you can use to update the devices.
Why Do I Receive an Enumeration Error?
If you are using a desktop computer with the NI-USRP instrument driver installed, it
is possible that there is a compatibility issue between your computer and the PCIe
card. Complete the following steps to confirm this issue and resolve it.
1. Navigate to Start » Device Manager to confirm the issue by verifying that PCI
Data Acquisition and Signal Processing Device/Controller appears in Device
Manager and that your USRP RIO device does not.
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USRP-2940/2942/2943/2944/2945 Getting Started

If you cannot confirm this, then the issue is not likely caused by a
compatibility problem between your computer and the PCIe card. Contact NI
or visit ni.com/support
2. Install the latest BIOS Compatibility soware.
3. Restart your computer.
4. Complete the steps appropriate for your installed ADE in Verifying the Device
Connection. Repeat step 1 and observe if the outcome has changed. If you
still receive an Enumeration Error, continue to step 5.
5. Power o your computer and remove the MXI card.
6. Toggle switch 1.
7. Reinstall the MXI card and power on your computer.
8. Repeat step 4. If nothing has changed, continue to step 7.
9. Uninstall the BIOS Compatibility soware. Restart your computer.
10. Repeat step 4.
If trouble persists, contact NI or visit ni.com/support.
Why Don't NI-USRP Examples Appear in the NI Example Finder in
LabVIEW?
NI-USRP does not install examples into the NI Example Finder.
Related concepts
■NI-USRP Examples, Lessons, and Sample Projects
Direct Connections to the Device
The USRP RIO device is a precision RF instrument that is sensitive to ESD and
transients. Ensure you take the following precautions when making direct
connections to the USRP RIO device to avoid damaging the device.
Notice Apply external signals only while the USRP RIO device is powered
on. Applying external signals while the device is powered o may cause
damage.
© National Instruments 19
USRP-2940/2942/2943/2944/2945 Getting Started

■ Ensure you are properly grounded when manipulating cables or antennas
connected to the USRP RIO device TX 1 RX 1, RX 1, or RX 2 connector.
■ If you are using nonisolated devices, such as a nonisolated RF antenna,
ensure the devices are maintained in a static-free environment.
■If you are using an active device, such as a preamplifier or switch routed to
the USRP RIO device TX 1 RX 1, RX 1, or RX 2 connector, ensure that the device
cannot generate signal transients greater than the RF and DC specifications of
the USRP RIO device TX 1 RX 1, RX 1, or RX 2 connector.
USRP-2940 Front Panel, Back Panel, and LEDs
Front Panel
LINK
TX OUTPUT MAX +20 dBm, RX INPUT MAX -15 dBm, ALL RF PORTS 50 Ω
TX1 RX1 RX2GPSPPSREF
TX1 RX1 RX2
JTAG
PWR
Pin Description
JTAG A USB port that connects the host computer to the device FPGA for development
and debugging. LabVIEW FPGA does not currently support configuring or
programming the device FPGA using the JTAG connector.
RF 0 TX1 RX1 Input and output terminal for the RF signal. TX1 RX1 is an SMA (f) connector with an
impedance of 50 Ω and is a single-ended input or output channel.
RX2 Input terminal for the RF signal. RX2 is an SMA (f) connector with an impedance of
50 Ω and is a single-ended input channel.
AUX I/O General-purpose I/O (GPIO) port. AUX I/O is controlled by the FPGA.
RF 1 TX1 RX1 Input and output terminal for the RF signal. TX1 RX1 is an SMA (f) connector with an
impedance of 50 Ω and is a single-ended input or output channel.
RX2 Input terminal for the RF signal. RX2 is an SMA (f) connector with an impedance of
50 Ω and is a single-ended input channel.
Table 8. Connector Descriptions
ni.com
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USRP-2940/2942/2943/2944/2945 Getting Started