National Instruments BNC-2115 User manual

INSTALLATION GUIDE
BNC-2115
Desktop and DIN Rail-Mountable BNC Adapter for E Series Devices
This installation guide describes how to install and configure your
BNC-2115 accessory. If you have not already installed your DAQ device,
refer to the DAQ Quick Start Guide for instructions.
The BNC-2115 is a desktop and DIN rail-mountable BNC adapter you
can connect to data acquisition (DAQ) devices. The BNC-2115 includes
24 BNC connectors and a two-position screw terminal.
The BNC-2115 has one 68-pin connector on the rear panel to connect to
your DAQ device.The 68-pin I/O connector connects to the extended
analog input of 64-channel Multifunction DAQ devices and the extended
digital I/O (DIO) of Multifunction DAQ devices. The BNC-2115 is ideal
for simplifying connections between your measurement apparatus and your
DAQ device in laboratory, test, and production environments.
What You Need to Get Started
To set up and use your BNC-2115 accessory, you need the following:
❑BNC-2115 BNC adapter
❑BNC-2115 Installation Guide
❑SH1006868 cable
❑One of the following Multifunction DAQ devices:
– NI PCI-6033E
– NI PCI/PXI-6025E
– NI PCI/PXI-6031E
– NI PCI/PXI-6071E
– NI AT-MIO-64E-3
– NI AT-MIO-16DE-10

BNC-2115 Installation Guide 2 ni.com
For detailed specifications for the BNC-2115, refer to the Specifications
section.
Caution Do not connect the BNC-2115 to any device other than the National Instruments
devices listed previously. Doing so can damage the BNC-2115, the DAQ device, or the host
computer. National Instruments is not liable for damage resulting from these connections.
Installing the BNC-2115
To connect the BNC-2115 to your DAQ device, refer to Figure 1 as you
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.
Figure 1. Connecting the BNC-2115 to Your DAQ Device
1 BNC-2115
2 SH1006868 Cable
3DAQDevice
4 Personal Computer
+
_+
FLOA
TING
SOURCE(FS)
GROUNDREF
.
SOURCE(GS)
ANALOG INPUT DIGITALI /O
AISENSE PB3
AIGND DGND
1
4
3
2

©National Instruments Corporation 3 BNC-2115 Installation Guide
1. Place the BNC-2110 near the host computer or use the optional DIN
rail-mounting kit, which you can order from National Instruments.
For more information about the DIN rail-mounting kit, refer to the
National Instruments Web site at ni.com or call the office nearest you.
2. With your DAQ device powered off, connect the BNC-2115 to your
DAQ device with the extended I/O end of the SH1006868 cable.
3. Make sure the floating source (FS)/ground-referenced source (GS)
switches under BNC connectors AI <16..55> are set correctly for your
application. National Instruments recommends that you set the
switches to GS for analog output and digital signals.
4. Connect the field signals to the BNC connectors and/or digital screw
terminal plugs. Refer to the Connecting Signals to the BNC-2115
section for more information.
5. Refer to the DAQ Quick Start Guide to launch Measurement &
Automation Explorer (MAX), confirm that your device is recognized,
and configure your device settings. National Instruments recommends
that you use your DAQ device in differential mode when using the
BNC-2115.
6. 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-2115, power off any external
signals connected to the BNC-2115 before you power off the computer.
Caution The BNC-2115 is not designed for input voltages greater than 42 V, even if a
user-installed voltage divider reduces the voltage to within the input range of the DAQ
device. Input voltages greater than 42 V can damage the BNC-2115, 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.
Connecting Signals to the BNC-2115
This section describes how to configure the BNC-2115. Figure 2 shows the
front panel of the BNC-2115
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 terminal names and their NI-DAQmx
equivalents, refer to the Terminal Name Equivalences table in the E Series Help at
ni.com/manuals.

BNC-2115 Installation Guide 4 ni.com
Figure 2. BNC-2115 Front Panel
1 Screw Terminals
2 BNC Connectors
3 Floating Source (FS)/
Ground-Reference Source (GS) Switch
4 BNC Center Pin
5 BNC Shield
_
+
_
+
Floating
Source (FS)
Ground Ref.
Source (GS)
AI GND D GND
AI SENSE P1.3
AI16
AO8
AI22
AO14
AI36
AO16
P2.7 P2.1 P1.2 P0.4
P2.6 P2.0 P1.1 P0.3
P2.5 P1.7 P1.0 P0.2
P2.4 P1.6 P0.7 P0.1
P2.3 P1.5 P0.6 P0.0
P2.2 P1.4 P0.5 +5V
AI17
AO9
AI23
AO15
AI37
AO21
AI18
AO10
AI32
AO16
AI38
AO22
AI52
AI19
AO11
AI33
AO17
AI39
AO23
AI20
AO12
AI34
AO18
AI48
AO24
AI20
AO12
AI35
AO19
AI49
AO25
AI55
AO31
1
3
ANALOG IN · ANALOG OUT
DIGITAL I/O
BNC-2115
2
4
AI54
AO30
AI53
AO29
AI55
AO31
AI51
AO27
AI50
AO26
5

©National Instruments Corporation 5 BNC-2115 Installation Guide
To connect AI signals to the NI PCI/PXI-60XXE and AT-MIO-64E-3
devices using the AI <16..55> BNC-2115 connectors, refer to the
Connecting Analog Input Signalssection.
To connect DIO signals to the NI PCI/PXI-6025E and AT-MIO-16DE-10
devices using the P0.<0..7>, P1.<0..7>, and P2.<0..7> BNC-2115
connectors, refer to the Connecting Digital I/O Signals section.
Connecting Analog Input Signals
National Instruments recommends that you use the BNC-2115 in
differential mode. If you need more analog inputs in your application than
are available using differential mode, you can configure your DAQ device
in single-ended mode and double the number of analog input channels.
Refer to the Operating the BNC-2115 in Single-Ended Mode section
for details. You can use the BNC-2115 to measure floating and
ground-referenced analog input signals in differential mode.
Measuring Floating Signal Sources
To measure floating signal sources, move the switch located below the
applicable analog input BNC to the floating source switch position labeled
FS. In the floating source switch position, the amplifier negative terminal
is connected to ground using a 5 kΩ resistor in parallel with a 0.1 µF
capacitor. Table 1 shows the BNC-2115 switch configuration options.
Note Measuring floating signal sources, such as isolated battery-powered equipment,
with the GS setting results in incorrect measurements.

BNC-2115 Installation Guide 6 ni.com
Measuring Ground-Referenced Signals
To measure ground-referenced signals, move the switches to either
the floating or ground-referenced source position. However, for best
performance, use the ground-referenced source position labeled GS to
avoid ground loops. Refer to your DAQ device documentation for more
information on measuring floating and ground-referenced signals.
The BNC-2115 connectors AI <16..55> correspond to the device
differential analog channels 16 to 55.
Table 1. Configuration Summary
BNC-2115 Switch
Configuration
Signal Source Types
Floating Source Ground-Referenced Source
Floating Source
(FS)
Ground-
Referenced Source
(GS)
+
–
Signal
Source BNC-2115
DAQ Device
(Differential Input
Mode)
AI GND
+
–
Recommended
+
–
Signal
Source BNC-2115
DAQ Device
(Differential Input
Mode)
AI GND
+
–
Not Recommended
+
–
Signal
Source BNC-2115
Improper Configuration
DAQ Device
(Differential Input
Mode)
+
–
AI GND
+
–
Signal
Source BNC-2115
DAQ Device
(Differential Input
Mode)
AI GND
+
–
Recommended

©National Instruments Corporation 7 BNC-2115 Installation Guide
Table 2 describes the two-position terminal block signals on the front panel
of the BNC-2115.
Connecting Analog Output Signals
National Instruments recommends that you set the switches to the
ground-referenced (GS) position when measuring analog output signals.
The AO <8..31> channels correspond with the AI <16..33>, AI <32..39>,
and AI <48..55> connectors. For details on how each AO signal
corresponds to each AI signal, refer to Figure 2.
Connecting Digital I/O Signals
Use the BNC connectors and the two-position screw terminal to connect
your digital signals to your DAQ device. The DIO signal can be accessed
on the center pin of the applicable BNC connector, while digital ground can
be accessed on the outer shield of the BNC connector. Tables 3 and 4
describe the connectors for digital signals on the front panel of the
BNC-2115.
Table 2. BNC-2115 Two-Position Terminal Block Signal Descriptions
Two-Position
Terminal Block
Connector Signal Description
AI GND Analog Input Ground—The analog input
voltages are referenced to this node.
AI SENSE Analog Input Sense—This pin serves as the
reference node for channels AI <16..63> in
NRSE configurations.
Table 3. BNC-2115 BNC Connections for Extended DIO Accessory
Front Panel BNC
Connectors Signal Description
P2.<0..7> Bidirectional DIO Port 2, channels
0 through 7
P1.<0..7> Bidirectional DIO Port 1, channels
0 through 71
P0.<0..7> Bidirectional DIO Port 0, channels
0 through 7
1You also can connect to P1.3 through a terminal block screw connector. Refer to Table 4.

BNC-2115 Installation Guide 8 ni.com
To connect DIO signals to the NI PCI-60XXE and NI AT-MIO-64E-3
devices, use the AI <16..55> BNC-2115 connectors. To connect DIO
signals to the NI PCI-6025E and NI AT-MIO-16DE-10 devices, use the
P0.<0..7>, P1.<0..7>, and P2.<0..7> BNC-2115 connectors.
For more detailed information about how the accessory terminals
correspond one-to-one to the Multifunction DAQ device, refer to the I/O
Connector Pinouts Table in the E Series Help at ni.com/manuals.
Operating the BNC-2115 in Single-Ended Mode
You can increase the number of analog input channels by configuring
the DAQ device analog input to operate in either referenced single-ended
(RSE) mode, or nonreferenced single-ended (NRSE) mode. In either of
these modes, each BNC coaxial cable carries two single-ended channels,
instead of one differential channel.
To configure the analog input using Traditional NI-DAQ, open
Measurement & Automation Explorer (MAX), open Devices and
Interfaces»Traditional NI-DAQ Devices, then right-click the icon for
your device. Select Properties from the menu, then click the AI tab and
change the analog input (AI) mode to RSE or NRSE.
To configure input terminals using NI-DAQmx, use the DAQ Assistant or
the NI-DAQmx API. For more information, refer to the DAQ Assistant Help
and the Measurement and Automation Explorer Help for NI-DAQmx.
Table 4. BNC-2115 Two-Position Terminal Block Connections for
Extended DIO Accessory
Two-Position
Terminal Block
Connector Signal Description
D GND Digital Ground—This pin supplies the
reference for the digital signals at the I/O
connector as well as the +5 VDC supply.
P1.3 Port 1 line 3—This is the bidirectional
DIO line for Port 1.

©National Instruments Corporation 9 BNC-2115 Installation Guide
Table 5 shows the connections that you need to make.
Table 5. Analog BNC Pairs
BNC Center
Pin
BNC Outer
Shield
Signal
Reference
Ground
Reference
AI 16 AI 24 AI SENSE AI GND
AI 17 AI 25 AI SENSE AI GND
AI 18 AI 26 AI SENSE AI GND
AI 19 AI 27 AI SENSE AI GND
AI 20 AI 28 AI SENSE AI GND
AI 21 AI 29 AI SENSE AI GND
AI 22 AI 30 AI SENSE AI GND
AI 23 AI 31 AI SENSE AI GND
AI 32 AI 40 AI SENSE AI GND
AI 33 AI 41 AI SENSE AI GND
AI 34 AI 42 AI SENSE AI GND
AI 35 AI 43 AI SENSE AI GND
AI 36 AI 44 AI SENSE AI GND
AI 37 AI 45 AI SENSE AI GND
AI 38 AI 46 AI SENSE AI GND
AI 39 AI 47 AI SENSE AI GND
AI 48 AI 56 AI SENSE AI GND
AI 49 AI 57 AI SENSE AI GND
AI 50 AI 58 AI SENSE AI GND
AI 51 AI 59 AI SENSE AI GND
AI 52 AI 60 AI SENSE AI GND
AI 53 AI 61 AI SENSE AI GND
AI 54 AI 62 AI SENSE AI GND
AI 55 AI 63 AI SENSE AI GND

BNC-2115 Installation Guide 10 ni.com
Specifications
This section lists the specifications of the BNC-2115. These specifications
are typical at 25 °C unless otherwise specified.
Field connection .....................................24 BNC connectors
Screw terminal........................................2-pin
Physical
Dimensions .............................................19.05 by 10.48 by 3.51 cm
(7.5 by 4.125 by 1.38 in.)
I/O connector ..........................................68-pin male connector
BNC connectors......................................24
Screw terminal plugs ..............................2
Environment
Operating temperature ............................0 to 70 °C
Storage temperature ................................–55 to 125 °C
Relative humidity ...................................5 to 90% noncondensing
Safety
The BNC-2110 meets the requirements of the following standards for
safety and electrical equipment for measurement, control, and
laboratory use:
• IEC 61010-1, EN 61010-1
• UL 3111-1, UL 61010B-1
• CAN/CSA C22.2 No. 1010.1
Note For UL and other safety certifications, refer to the product label or to ni.com.