National Instruments BNC-2120 Bedienungsanleitung

INSTALLATION GUIDE

BNC-2120

Connector Accessory for E/M/S/X 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/X 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

What You Need to Get Started ................................................................................................. 2

Installing the BNC-2120........................................................................................................... 2

Connecting Analog Input Signals............................................................................................. 5

Connecting Differential Analog Input Signals ................................................................. 6

Measuring Floating Signals ...................................................................................... 6

Measuring Ground-Referenced Signals.................................................................... 7

Measuring Temperature.................................................................................................... 7

Measuring Resistance ....................................................................................................... 8

Connecting Analog Output Signals .......................................................................................... 8

Using the Function Generator................................................................................................... 9

Connecting Timing I/O Signals ................................................................................................ 9

Using the Quadrature Encoder ......................................................................................... 12

Connecting User-Defined Signals ............................................................................................ 13

Connecting Digital I/O Signals................................................................................................. 14

Specifications............................................................................................................................ 14

2|ni.com |BNC-2120 Installation Guide

What You Need to Get Started

To set up and use your BNC-2120 accessory, you need the following:

BNC-2120 accessory/accessories1

BNC-2120 Installation Guide

One of the following DAQ devices:

– 68-pin E/M/S/X Series device (with one or two I/O connectors)2

– 100-pin E Series device

Cable(s) for DAQ device(s), as listed in Table 1

The E Series User Manual, the M Series User Manual, the S Series User Manual, or the

X Series User Manual

BNC cables

28–16 AWG wire

Wire strippers

Flathead screwdriver

Installing the BNC-2120

Caution 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.

Figure 1 shows the front panel of the BNC-2120.

1 You can use two BNC-2120 accessories with both connectors of two connector M/X Series devices.

2 You cannot use the BNC-2120 with Connector 1 of NI 6225/6255 devices.

BNC-2120 Installation Guide |© National Instruments |3

Figure 1. BNC-2120 Front Panel

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

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

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

+Floating

Source (FS)

Ground Ref.

Source (GS)

ANALOG OUTPUTS

ANALOG INPUTS

DIGITAL I/O

FUNCTION GENERATOR

Frequency Selection

Amplitude Adjust

Sine /Triangle TTL Square Wave

Frequency Adjust

GSFS GSFS

AI 0 AI 1

USER 1

USER 2

P0.7

P0.6

P0.5

P0.4

P0.3

P0.2

P0.1

P0.0

D GND

AI 2

BNC

RES+

AI GND

AI SENSE

RES-

Temp.

Ref.

0.1-10 kHz

LO HI LO HI

1-100 kHz 13-1000 kHz

Thermo

couple

BNC

RES

AI 3

BNC

AI 3

AI 4 AI 5

AI 6 AI 7

AO 0 AO 1

USER-DEFINED

SIGNALS*

*For BNC connections, wire

anyTiming I/O or Digital I/O

screw terminals here.

PWR

BNC-2120

TIMING I/O

PFI 0 / P1.0

96 Pulses/ Rev

Quadrature

Encoder

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

+5 V

PULSES

UP/DN

D GND

4|ni.com |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 guides for instructions.

Caution Do not connect the BNC-2120 to any device other than National

Instruments E/M/S/X 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 ni.com.

Caution Do not connect input voltages greater than 42.4 Vpk/60 VDC to the

BNC-2120. The BNC-2120 is not designed for any input voltages greater than

42.4 Vpk/60 VDC, even if a 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.

Caution To ensure the specified EMC performance, operate this product only with

shielded cables and accessories.

Table 1. BNC-2120 Cabling Options

Number

of Pins DAQ Device

Shielded

Recommended Cable

Unshielded

Cable

68-pin DAQCard E Series,

NI PCI/PCIe/PXI/PXIe M Series*

NI 6143 S Series,

PCIe/PXIe/USB X Series

SHC68-68-EPM RC68-68

PCI/PXI E Series,

USB Mass Termination M Series*,

NI 611x/612x/613xS Series†

SH68-68-EPM R6868†

100-pin PCI/PXI E Series SH1006868 —

Caution: For compliance with Electromagnetic Compatibility (EMC) requirements, this product must

be operated with shielded cables and accessories. If unshielded cables or accessories are used, the EMC

specifications are no longer guaranteed unless all unshielded cables and/or accessories are installed in a

shielded enclosure with properly designed and shielded input/output ports.

*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.

BNC-2120 Installation Guide |© National Instruments |5

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 guides

for more information.

4. Connect signals to the BNC connectors and screw terminal block as described in the

following sections.

Caution To ensure the specified EMC performance, operate this product only with

shielded cables and accessories. When connecting signals to the screw terminal

blocks, the wires must be shielded (e.g. one conductor of a shielded, multi-conductor

cable). The cable shield must be terminated to the D GND or AI GND terminal of the

terminal block using as short a connection as is practical.

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.

5. Test specific device functionality, such as the ability to send and receive data with MAX

test panels. Refer to the DAQ Getting Started guides 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

6|ni.com |BNC-2120 Installation Guide

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.1

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.

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 kΩresistor, as shown in Figure 2. Refer to your

DAQ device documentation for more information about measuring floating signals.

Figure 2. Measuring a Floating Signal Source

1 When using the BNC-2120 with Connector 1 of two connector M/X Series devices, the AI <0..7> BNCs

on the BNC-2120 map to the AI <16..23> channels on the device.

–

Signal

Source BNC-2120

DAQ Device

(Differential Input Mode)

AI GND

–

4.99 kΩ

FSMode

0.1 μF

BNC-2120 Installation Guide |© National Instruments |7

Measuring Ground-Referenced Signals

To measure ground-referenced signals, move the switch below the BNC connector for the

AI channel you are using to the GS position. Using the ground-referenced source switch position

avoids ground loops, as shown in Figure 3. Refer to your DAQ device documentation for more

information about measuring ground-referenced signals.

Figure 3. Measuring a Ground-Referenced Signal Source

AI GND and AI SENSE signals are located at the analog input screw terminals of the

BNC-2120. When connecting signals to the screw terminals, use 28–16 AWG wire with the

insulation stripped to 0.28 in.

Measuring Temperature

You can measure temperature on the BNC-2120 with the temperature reference and

thermocouple connector.

To use the integrated circuit (IC) temperature reference on the BNC-2120, move the BNC/Temp.

Ref. switch above the AI 0 BNC to Temp. Ref. The integrated circuit (IC) temperature reference

provides built-in cold-junction compensation (CJC) through software. The IC sensor voltage is

linearly proportional to the sensor temperature where:

°C = Volts ×100

The sensor is accurate to ±1.5 °C.

To use the thermocouple on the BNC-2120, move the BNC/Thermocouple switch above the AI 1

BNC to Thermocouple. You can connect any type of thermocouple with a two-prong miniature

or subminiature male connector to the thermocouple connector.

For more information on thermocouples and CJC, refer to the Developer Zone document, Taking

Thermocouple Temperature Measurements, by going to ni.com/info and entering the Info

Code rdtttm.

–

Signal

Source BNC-2120

DAQ Device

(Differential Input Mode)

AI GND

–

4.99 kΩ

GSMode

0.1 μF

8|ni.com |BNC-2120 Installation Guide

Measuring Resistance

You can measure resistance with the analog input screw terminals on the BNC-2120. Figure 4

is a schematic representation of how the BNC-2120 measures resistance.

Figure 4. Measuring Resistance on the BNC-2120

RES+ is internally connected to AI 3 and VCC. RES– is internally connected to AI 11. There is

also a 10 kΩresistor between AI 11 and AI GND.

When connecting signals to the screw terminals, use 28–16 AWG wire with the insulation

stripped to 0.28 in.

Complete the following steps to measure resistance.

1. Move the RES/BNC switch above the AI 3 BNC to the RES position.

2. Configure your software to measure AI 3 and AI 11 in referenced single-ended (RSE)

mode.

3. Connect the resistor to the RES+ and RES– screw terminals.

You can measure resistors with values ranging from 100 Ωto 1 MΩ.

4. Measure VCC on AI 3 and the voltage drop across the internal 10 kΩresistor on AI 11.

5. With these measurements, calculate the resistor value using the following formula:

Connecting Analog Output Signals

Use the AO <0..1> BNC connectors on the BNC-2120 front panel to connect analog output

signals to your DAQ device.1The number of connectors you use depends on your DAQ device

and application. Refer to your DAQ device documentation for information about the use of these

signals.

1 When using the BNC-2120 with Connector 1 of two connector M/X Series devices, the AO <0..1> BNCs

on the BNC-2120 map to the AO <2..3> channels on the device.

RES+ AI 3

BNC-2120

VCC

User Resistor

AI 11

AI GND

AI SENSE

RES–

Resistor Value VAI 3 VAI 11

–

VAI 11 10 kΩ()⁄

---------------------------------------=

BNC-2120 Installation Guide |© National Instruments |9

Using the Function Generator

The BNC-2120 has a function generator that produces sine or triangle waveforms and

TTL-compatible square waveforms. Use the switch below the Sine/Triangle BNC to select a sine

wave or triangle wave output for the connector. A TTL-compatible square wave is always

present at the TTL Square Wave BNC.

To adjust the frequency of the function generator, select your frequency range using the

Frequency Selection switch. You can select 0.1–10 kHz, 1–100 kHz, or 13–1000 kHz. The

Frequency Adjust knob adjusts the frequency within the preselected range for the sine or triangle

wave and the TTL square wave outputs.

The Amplitude Adjust knob adjusts the amplitude of the sine or triangle wave output up to

4.4 Vp-p.

Connecting Timing I/O Signals

Connect the timing I/O signals of your DAQ device to the PFI 0/P1.0 (AI START TRIG) BNC

or the timing I/O screw terminals on the BNC-2120. When connecting signals to the screw

terminals, use 28–16 AWG wire with the insulation stripped to 0.28 in.

Table 2 describes the timing I/O BNC and terminal signals on the BNC-2120.

Table 2. BNC-2120 Timing I/O BNC/Terminal Descriptions

BNC/Terminal Description

PFI 0/P1.0 Programmable Function Interface channel 0 or Port 1 Digital

Input/Output channel 0

AI START TRIG (AI Start Trigger Signal)—As an output, this pin is the

ai/StartTrigger signal. In post-trigger DAQ sequences, a low-to-high

transition indicates the initiation of the acquisition sequence. In

applications with pre-trigger samples, a low-to-high transition indicates

the initiation of the pre-trigger samples.

PULSES Refer to the Using the Quadrature Encoder section for information

about using these terminals.

UP/DN

PFI 1/P1.1 Programmable Function Interface channel 1 or Port 1 Digital

Input/Output channel 1

AI REF TRIG (AI Reference Trigger Signal)—As an output, this pin is

the ai/ReferenceTrigger signal. In applications with pretrigger samples,

a low-to-high transition indicates the initiation of the post-trigger

samples. AI Reference Trigger

is not used in applications with posttrigger samples.

10 |ni.com |BNC-2120 Installation Guide

PFI 2/P1.2 Programmable Function Interface channel 2 or Port 1 Digital

Input/Output channel 2

AI CONV CLK (AI Convert Clock Signal)—As an output, this pin is the

ai/ConvertClock signal. A high-to-low edge on AI CONV indicates that

an A/D conversion is occurring.

PFI 3/P1.3 Programmable Function Interface channel 3 or Port 1 Digital

Input/Output channel 3

CTR 1 SOURCE (Counter 1 Source Signal)—As an output, this pin is

the Ctr1Source signal. This signal reflects the actual source connected to

the general-purpose counter 1.

PFI 4/P1.4 Programmable Function Interface channel 4 or Port 1 Digital

Input/Output channel 4

CTR 1 GATE (Counter 1 Gate Signal)—As an output, this pin is the

Ctr1Gate signal. This signal reflects the actual gate signal connected to

the general-purpose counter 1.

PFI 5/P1.5 Programmable Function Interface channel 5 or Port 1 Digital

Input/Output channel 5

AO SAMP CLK (AO Sample Clock Signal)—As an output, this pin is

the ao/SampleClock signal. A high-to-low edge on AO SAMP indicates

that the AO primary group is being updated.

PFI 6/P1.6 Programmable Function Interface channel 6 or Port 1 Digital

Input/Output channel 6

AO START TRIG (AO Start Trigger Signal)—As an output, this pin is

the ao/StartTrigger signal. In timed AO sequences, a low-to-high

transition indicates the initiation of the waveform generation.

PFI 7/P1.7 Programmable Function Interface channel 7 or Port 1 Digital

Input/Output channel 7

AI SAMP CLK (AI Sample Clock Signal)—As an output, this pin is the

ai/SampleClock signal. This pin pulses once at the start of each AI

sample in the interval sample. A low-to-high transition indicates the start

of the sample.

Table 2. BNC-2120 Timing I/O BNC/Terminal Descriptions (Continued)

BNC/Terminal Description

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