National Instruments BNC-2111 User manual

INSTALLATION GUIDE
BNC-2111
BNC Accessory for M Series and E Series Devices
This installation guide describes how to install and configure your
BNC-2111 accessory. If you have not already installed your DAQ device,
refer to the DAQ Quick Start Guide for instructions.
The BNC-2111 is an adapter you can connect to data acquisition (DAQ)
devices. The BNC-2111 includes 24 BNC connectors that allow
connections for 16 single-ended analog input signals, 2 analog output
signals, 5 digital I/O / programmable function input (PFI) signals, and the
external reference voltage for analog output. The BNC-2111 also includes
a single two-position switch for selecting between floating source and
ground-referenced analog input signals.
National Instruments offers two versions of the BNC-2111:
• With metal enclosure
• Without metal enclosure (board only)
Both versions of the BNC-2111 are suitable for desktop use. An optional
DIN rail-mounting kit for the BNC-2111 with metal enclosure is available
from NI.
The available signals on the BNC-2111 are listed in the Specifications
section. If your application requires differential connections or other digital
signals, consider other NI products such as the BNC-2090, BNC-2110,
BNC-2115, or BNC-2120.
The BNC-2111 has one 68-pin connector to connect to your DAQ device.
The BNC-2111 is ideal for simplifying connections between your
measurement apparatus and your DAQ device in laboratory, test, and
production environments.

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Figure 1. BNC-2111 Front Panel (Shown with Metal Enclosure)
1 Floating Source (RSE)/
Ground-Referenced Source (NRSE) Switch
2 BNC Connectors
3 BNC Center Pin
4 BNC Shield
AI GND AI SENSE
AI0 AI6 AI12
AI1 AI7 AI13
AI2 AI8 AI14
AI3 AI9 AI15
AI4 AI10 AO0
AI5 AI11 AO1 APFI 0/
(AO EXT REF)
BNC-2111
2
3
PFI 13/P1.0
(CTR 1 OUT)
PFI 12/P2.4
(CTR O OUT)
PFI 7/P1.7
(PFI 7/AI SAMP)
PFI 2/P1.2
(PFI 2/AI CONVERT)
4
NRSE
RSE
AIx
M SERIES (E SERIES)
1
PFI 0/P1.0
(PFI 0/AI START)

©National Instruments Corporation 3 BNC-2111 Installation Guide
What You Need to Get Started
To set up and use your BNC-2111 accessory, you need the following:
❑BNC-2111 BNC accessory
❑BNC-2111 Installation Guide
❑Cable for connecting your DAQ device to the BNC-2111. Refer to the
Choosing a Cable section for information on which cable to use for
your DAQ device.
❑M Series or E Series Multifunction DAQ Device
For detailed specifications for the BNC-2111, refer to the Specifications
section.
Caution Do not connect the BNC-2111 to any device other than the National Instruments
devices listed in the Choosing a Cable section. Doing so can damage the BNC-2111, the
DAQ device, or the host computer. National Instruments is not liable for damage resulting
from these connections.
Choosing a Cable
Refer to Tables 1 through 5 to choose the correct cable for your DAQ
device.
Table 1. 68-Position VHDCI I/O Connector
DAQ Device Connector Diagram
NI 6220/6221
NI 6250/6251
NI 6280/6281
NI DAQCard-6024E
NI DAQCard-6036E
NI DAQCard-6062E
DAQ Device
SHC68-68-EPM
Cable
BNC-2111

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Table 2. 68-Pin SCSI-II I/O Connector
DAQ Device Connector Diagram
NI 6013/6014
DAQPad-6020E
PCI-6023E/PCI-6024E
NI 6030E/6032E
NI 6034E/6035E/PCI-6036E
NI 6040E
NI 6052E/DAQPad-6052E
NI-6070E/DAQPad-6070E
PCI-MIO-16E-1
PCI-MIO-16E-4
PCI-MIO-16XE-10
PCI-MIO-16XE-50
Table 3. Double 68-Position VHDCI I/O Connector—32 AI Channels
DAQ Device Connector Diagram
NI 6224/6229
NI 6254/6259
NI 6284/6289
DAQ Device SH68-68-EP Cable BNC-2111
BNC-2111
SHC-68-68-EPM Cable BNC-2111
SHC-68-68-EPM Cable
DAQ Device
Connector 1
Connector 0

©National Instruments Corporation 5 BNC-2111 Installation Guide
Table 4. Double 68-Position VHDCI I/O Connector—80 AI Channels
M Series Device Connector Diagram
NI 6225
Table 5. 100-Pin Female 0.050 D-Type I/O Connector
DAQ Device Connector Diagram
NI 6025E
NI 6031E/6033E
NI 6071E
BNC-2111
SHC-68-68 Cable BNC-2115
or other
accessory
SHC-68-68-EPM Cable
DAQ Device
Connector 1
Connector 0
BNC-2115
or other
accessory
SH100-68-68 Cable
BNC-2111
Extended I/O Leg
DAQ Device
MIO-16 Leg

BNC-2111 Installation Guide 6 ni.com
Installing the BNC-2111
To connect the BNC-2111 to your DAQ device, complete the following
steps. Consult your computer user manual or technical reference manual
for specific instructions and warnings.
Note If you have not already installed your DAQ device, refer to the DAQ Quick Start
Guide for instructions.
1. Place the BNC-2111 near the host computer or use the optional DIN
rail-mounting kit, which you can order from National Instruments. The
DIN rail-mounting kit can only be used with the BNC-2111 with metal
enclosure. For more information about the DIN rail-mounting kit, refer
to the National Instruments Web site at ni.com or call the branch
office nearest you.
2. With your DAQ device powered off, connect the BNC-2111 to your
DAQ device with the selected cable.
3. Determine if your input signals are floating source or
ground-referenced:
•Floating Signal Sources—A floating signal source is not
connected to the building ground system, but has an isolated
ground-reference point. Some examples of floating signal sources
are outputs of transformers, thermocouples, battery-powered
devices, optical isolators, and isolation amplifiers. An instrument
or device that has an isolated output is a floating signal source.
•Ground-Referenced Signal Sources—A ground-referenced
signal source is connected to the building system ground, so it is
already connected to a common ground point with respect to the
device, assuming that the computer is plugged into the same
power system as the source. Nonisolated outputs of instruments
and devices that plug into the building power system fall into this
category.
4. Make sure the referenced single-ended (RSE)/nonreferenced
single-ended (NRSE) switch is set correctly for your application. Set
the switch to RSE to measure floating source signals, or to NRSE to
measure ground-referenced signals. The switch setting will be applied
to all 16 analog input BNC connectors. Refer to the Connecting
Signals to the BNC-2111 section for more information.

©National Instruments Corporation 7 BNC-2111 Installation Guide
5. Set your DAQ device to function correctly in software. The device
should be set to referenced single-ended mode (RSE) for measuring
floating source signals, or nonreferenced single-ended mode (NRSE)
for measuring ground-referenced signals.
•NI-DAQmx
– Set the appropriate terminal configuration when configuring
your global virtual channels in Measurement & Automation
Explorer (MAX).
– Or set these modes by using the Input Terminal Configuration
control of the DAQmx Create Virtual Channel VI or function
in your ADE.
• Traditional NI-DAQ (Legacy)
– Set the appropriate input mode when configuring your global
virtual channels or set the AI Mode property for your device
by right-clicking it under Devices and Interfaces and
selecting Properties in MAX.
– Or set these modes by using the Coupling & Input Config
control of the AI Config VI or by using the appropriate
function for your ADE.
6. Connect the field signals to the BNC connectors. Refer to the
Connecting Signals to the BNC-2111 section for more information.
7. Refer to the DAQ Quick Start Guide to launch MAX, confirm that your
device is recognized, and configure your device settings.
8. Test specific device functionality, such as the ability to send and
receive data. Refer to the DAQ Quick Start Guide for more detailed
information on running test panels in MAX.
When you have finished using the BNC-2111, power off any external
signals connected to the BNC-2111 before you power off the computer.
Caution The BNC-2111 is not designed for input voltages greater than 42 V. Input
voltages greater than 42 V can damage the BNC-2111, any device connected to it, and the
host computer. Overvoltage also can cause an electric shock hazard for the operator.
National Instruments is not liable for damage or injury resulting from misuse.

BNC-2111 Installation Guide 8 ni.com
Connecting Signals to the BNC-2111
This section describes how to configure the BNC-2111. Refer to the
Specifications section for a list of available signals on the BNC-2111.
Note With NI-DAQmx, National Instruments has revised its terminal names so they are
easier to understand and more consistent among NI hardware and software products. The
revised terminal names used in this document are usually similar to the names they replace.
For a complete list of Traditional NI-DAQ (Legacy) terminal names and their NI-DAQmx
equivalents, refer to the Terminal Name Equivalences tables in the M Series Help for
M Series devices or the E Series Help for E Series devices at ni.com/manuals.
Connecting Analog Input Signals
Measuring Floating Signal Sources
To measure floating signal sources, move the selector switch to the floating
source switch position labeled RSE. When the selector switch is set to the
RSE position, the outer shields of all 16 analog input BNC connectors are
connected to the DAQ device’s AI GND input, as shown in Figure 2 and
Figure 3.
Note Measuring floating signal sources, such as isolated battery-powered equipment,
with the NRSE setting results in incorrect measurements.
Measuring Ground-Referenced Signals
To measure ground-referenced signals, move the switch to the NRSE
position. Refer to your DAQ device documentation for more information
on measuring floating and ground-referenced signals. When the switch is
in the NRSE position, the outer shields of all 16 analog input BNC
connectors are connected to the DAQ device’s AI SENSE input as shown
in Figure 2 and Figure 3.

©National Instruments Corporation 9 BNC-2111 Installation Guide
Figure 2. BNC-2111 Signal Source Types
Figure 3. AI Channels 0–15 Connections
Signal
Source
DAQ Device
AI GND
+
–
+
–
AI GND
Signal
Source
DAQ Device
AI GND
+
–
+
–
AI SENSE
Floating Source Ground-Referenced Source
AI SENSE
AI GND
RSE/NRSE
Selector
Switch
AI 15
AI 14
AI 1
AI 0

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Connecting Analog Output and PFI Signals
Connect each AO signal to the appropriate BNC connector
(AO Channels 0–1).
Use the BNC connectors to connect or access PFI signals on your DAQ
device. Figure 4 shows these connections. Refer to Table 6 in the
Specifications section for more information.
Figure 4. AO and PFI Connections
AO 0
AO 1
APFI 0
PFI 0/P1.0
PFI 2/P1.2
PFI 7/P1.7
PFI 12/P2.4
PFI 13/P2.5
AO GND
D GND