INSTALLATION GUIDE
BNC-2120
Connector Accessory for E/M/S Series Devices
This installation guide describes how to install, configure, and use your BNC-2120 accessory with
68-pin or 100-pin E/M/S Series multifunction data acquisition (DAQ) devices. This document also
contains accessory specifications.
The BNC-2120 has the following features:
• Eight BNC connectors for analog input (AI) connection
• Onboard temperature reference
• Thermocouple connector
• Resistor measurement screw terminals
• Two BNC connectors for analog output (AO) connection
• Screw terminals for digital I/O (DIO) connection with state indicators
• Screw terminals for timing I/O (TIO) connection
• Two user-defined BNC connectors
• A function generator with the following outputs:
– Frequency-adjustable, TTL-compatible square wave
– Frequency- and amplitude-adjustable sine wave or triangle wave
• Quadrature encoder
• A 68-pin I/O connector that connects to multifunction DAQ devices
• Can be used on a desktop or mounted on a DIN rail
Contents
Conventions ......................................................................................................................................... 2
What You Need to Get Started ............................................................................................................ 2
Installing the BNC-2120 ...................................................................................................................... 2
Connecting Analog Input Signals ........................................................................................................ 5
Connecting Differential Analog Input Signals ............................................................................ 5
Measuring Floating Signals ................................................................................................. 5
Measuring Ground-Referenced Signals............................................................................... 6
Measuring Temperature ............................................................................................................... 6
Measuring Resistance .................................................................................................................. 7
Connecting Analog Output Signals ..................................................................................................... 7
Using the Function Generator.............................................................................................................. 8
Connecting Timing I/O Signals ........................................................................................................... 8
Using the Quadrature Encoder..................................................................................................... 10
Connecting User-Defined Signals ....................................................................................................... 10
Connecting Digital I/O Signals............................................................................................................ 11
Specifications....................................................................................................................................... 11
Conventions
The following conventions are used in this document:
<> Angle brackets that contain numbers separated by an ellipsis represent a range of values
associated with a bit or signal name—for example, AO <3..0>.
» The » symbol leads you through nested menu items and dialog box options to a final action.
The sequence File»Page Setup»Options directs you to pull down the File menu, select the
Page Setup item, and select Options from the last dialog box.
This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to avoid injury, data loss,
or a system crash. When this symbol is marked on a product, refer to the Read Me First: Safety
and Radio-Frequency Interference document for information about precautions to take.
bold Bold text denotes items that you must select or click in the software, such as menu items and
dialog box options. Bold text also denotes parameter names.
italic Italic text denotes variables, emphasis, a cross-reference, or an introduction to a key concept.
Italic text also denotes text that is a placeholder for a word or value that you must supply.
monospace Text in this font denotes text or characters that you should enter from the keyboard, sections
of code, programming examples, and syntax examples. This font is also used for the proper
names of disk drives, paths, directories, programs, subprograms, subroutines, device names,
functions, operations, variables, filenames, and extensions.
What You Need to Get Started
To set up and use your BNC-2120 accessory, you need the following:
❑ BNC-2120 accessory/accessories
1
❑ BNC-2120 Installation Guide
❑ One of the following DAQ devices:
– 68-pin E/M/S Series device (with one or two I/O connectors)
– 100-pin E Series device
2
❑ Cable(s) for DAQ device(s), as listed in Table 1
❑ The E Series User Manual, the M Series User Manual, or the S Series User Manual
❑ BNC cables
❑ 28–16 AWG wire
❑ Wire strippers
❑ Flathead screwdriver
Installing the BNC-2120
Figure 1 shows the front panel of the BNC-2120.
1
You can use two BNC-2120 accessories with both connectors of NI 6224/6229/6254/6259/6284/6289 M Series devices.
2
You cannot use the BNC-2120 with Connector 1 of NI 6225/6255 devices.
BNC-2120 Installation Guide 2 ni.com
1
2
3
4
4.
BNC
1.
2.
3.
+
_
Floating
Source (FS)
RES+
AI GND
AI SENSE
RES-
ANALOG INPUTS
RES
Temp.
BNC
Ref.
Ground Ref.
Source (GS)
AI 3
BNC
Thermo
couple
+
_
!
1
2
3
4
5
6
AI 0 AI 1
GSFS GSFS
AI 2
7
GSFS GSFS
AI 3
8
AI 4 AI 5
GSFS GSFS
NA
RTTSNI
BNC-2120
TIMING I/O
NOIA
M
U
Quadrature
96 Pulses /Rev
L
TN
E
PWR
PFI 0 / P1.0
Encoder
PULSES
UP/DN
PFI 1/ P1.1
PFI 2/ P1.2
PFI 3/ P1.3
PFI 4/ P1.4
PFI 5/ P1.5
PFI 6/ P1.6
PFI 7/ P1.7
PFI 8/ P2.0
PFI 9/ P2.1
PFI 12/ P2.4
PFI 13/ P2.5
PFI 14/ P2.6
+5V
D GND
S
24
23
22
21
20
9
10
11
12
13
14
15
1 RES/BNC Switch (AI 3)
2 Resistor Measurement Screw
Terminals
3 Thermocouple Input Connector
4 Temperature Reference
5 BNC/Temp. Ref. Switch (AI 0)
6 BNC/Thermocouple Switch (AI 1)
7 Analog Input BNC Connectors
8 FS/GS Switches
AI 6 AI 7
GSFS GSFS
ANALOG OUTPUTS
AO
AO 0 AO 1
FUNCTION GENERATOR
Frequency Selection
0.1-10 kHz
1-100 kHz 13-1000 kHz
Sine/Triangle TTL Square Wave
LO HI LO HI
Amplitude Adjust
Frequency Adjust
9 Analog Output BNC Connector
10 Frequency Range Selection Switch
11 Sine/Triangle BNC Connector
12 TTL Square Wave BNC Connector
13 Sine/Triangle Waveform Switch
14 Frequency Adjust Knob
15 Amplitude Adjust Knob
16 Digital I/O Screw Terminals
17 Digital I/O LEDs
Figure 1. BNC-2120 Front Panel
USER 1
USER 2
DIGITAL I/O
P0.7
P0.6
P0.5
P0.4
P0.3
P0.2
P0.1
P0.0
D GND
USER-DEFINED
SIGNALS*
19
18
*For BNC connections, wire
any Timing I/O or Digital I/O
screw terminals here.
17
16
18 User-Defined Screw Terminals
19 User-Defined BNC Connectors
20 Timing I/O Screw Terminals
21 Quadrature Encoder Screw
Terminals
22 Quadrature Encoder Knob
23 Timing I/O BNC Connector
24 Power Indicator LED
© National Instruments Corporation 3 BNC-2120 Installation Guide
To connect the BNC-2120 to your DAQ device, complete the following steps. Consult your computer or
PXI/PXI Express chassis user manual for specific instructions and warnings.
Note If you have not already installed your DAQ device, refer to the DAQ Getting Started Guide for
instructions.
Caution Do not connect the BNC-2120 to any device other than National Instruments E/M/S Series
multifunction DAQ devices. Doing so can damage the BNC-2120, the DAQ device, or the host
computer. National Instruments is not liable for damage resulting from these connections.
1. Place the BNC-2120 near the host computer or PXI/PXI Express chassis or use the optional DIN
Rail Mounting kit for UMI-FLEX-6 and BNC boxes (part number 777972-01), which you can
order from National Instruments at
Caution Do not connect input voltages greater than 42.4 V
BNC-2120 is not designed for any input voltages greater than 42.4 V
ni.com.
/60 VDC to the BNC-2120. The
pk
/60 VDC, even if a
pk
user-installed voltage divider reduces the voltage to within the input range of the DAQ device. Input
voltages greater than 42.4 Vpk/60 VDC can damage the BNC-2120, all devices connected to it, and
the host computer. Overvoltage can also cause an electric shock hazard for the operator. National
Instruments is not liable for damage or injury resulting from such misuse.
2. Connect the BNC-2120 to the DAQ device using the appropriate cable for your DAQ device,
as listed in Table 1.
Table 1. BNC-2120 Cabling Options
Number of Pins DAQ Device Recommended Cable(s)
68-pin DAQCard E Series,
NI PCI/PCIe/PXI/PXIe M Series
*
SHC68-68-EPM or RC68-68
NI 6143 S Series
PCI/PXI E Series,
USB Mass Termination M Series
NI 611x/612x/613x S Series
†
*
,
SH68-68-EPM or R6868
100-pin PCI/PXI E Series SH1006868
*
You cannot connect the BNC-2120 to Connector 1 of NI 6225/6255 devices.
†
Do not use the R6868 cable with NI 6115/6120 S Series devices; use only the SH68-68-EPM cable.
The power indicator LED, shown in Figure 1, lights. If it does not light, check the cable
connections.
3. Launch Measurement & Automation Explorer (MAX), confirm that your DAQ device is
recognized, and configure your device settings. Refer to the DAQ Getting Started Guide for more
information.
4. Connect signals to the BNC connectors and screw terminal block as described in the following
sections.
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 Equivalents table in the NI-DAQmx Help.
†
BNC-2120 Installation Guide 4 ni.com
5. Test specific device functionality, such as the ability to send and receive data with MAX test panels.
Refer to the DAQ Getting Started Guide for detailed information about running test panels in
MAX.
When you have finished using the BNC-2120, power off any external signals connected to the
BNC-2120 before you power off your computer.
Connecting Analog Input Signals
You can use the analog input BNCs on the BNC-2120 in the following ways:
• Measure differential AI signals, as described in the Connecting Differential Analog Input Signals
section
• Measure temperature, as described in the Measuring Temperature section
• Measure resistance, as described in the Measuring Resistance section
Connecting Differential Analog Input Signals
Use the BNC-2120 BNC connectors on the front panel to connect AI <0..7> signals to your DAQ device.
The BNC-2120 is only intended for differential analog input signals. The number of connectors you use
depends on your DAQ device and application. Complete the following steps to measure a differential
(DIFF) analog input signal.
1. Connect the BNC cable to one of the AI <0..7> BNC connectors on the front panel.
2. If you are using AI 0, move the BNC/Temp. Ref. switch to the BNC position.
If you are using AI 1, move the BNC/Thermocouple switch to the BNC position.
If you are using AI 3, move the RES/BNC switch to the BNC position.
3. Configure your software to measure the channel differentially.
4. Move the FS/GS switch to the applicable position, depending on whether you are measuring a
floating source (FS) or ground-referenced source (GS) analog input signal. Refer to the Measuring
Floating Signals and Measuring Ground-Referenced Signals sections for more information about
these signal sources.
1
Measuring Floating Signals
To measure floating signal sources, move the corresponding switch below the BNC connector to the FS
position. In the floating source switch position, the DAQ device’s amplifier negative terminal connects
to ground through a 4.99 kΩ resistor, as shown in Figure 2. Refer to your DAQ device documentation
for more information about measuring floating signals.
1
When using the BNC-2120 with Connector 1 of NI 6224/6229/6254/6259/6284/6289 devices, the AI <0..7> BNCs on the
BNC-2120 map to the AI <16..23> channels on the M Series device.
© National Instruments Corporation 5 BNC-2120 Installation Guide
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