National Instruments BNC-2121 Bedienungsanleitung

USER GUIDE

BNC-2121 Connector Accessory

for 660XDevices

The BNC-2121 connector accessory is a terminal block that connects

signals to a 660Xcounter device and can be used to test features of

a660Xdevice. Use this guide to install and connect signals to a BNC-2121

connector accessory for testing or for performing counter applications.

For specific information about using a 660Xdevice, refer to the 660X User

Manual.

What You Need to Get Started

You need the following items to install and use the BNC-2121 connector

accessory.

❑BNC-2121 connector accessory

❑BNC-2121 Connector Accessory for 660X Devices User Guide

❑660Xdevice

❑660X User Manual

❑68-position cable, such as the SH68-68-D1 or R6868

❑BNC cables

❑Wire no larger than 24 AWG

❑Wire strippers

BNC-2121 Connector Accessory for 660X Devices 2 ni.com

Connecting the BNC-2121 to a 660XDevice

You can use a BNC-2121 with any installed 660Xdevice. Connect one end

of a 68-position cable to a 660Xdevice and the other end to the

I/O connector on the BNC-2121, as shown in Figure 1.

Figure 1. Connecting a BNC-2121 to a 660XDevice

Note If the power LED indicator does not light up, check the cable connections to make

sure the cable is connected securely.

Connecting Signals to the BNC-2121

Connect signals using the spring terminals or BNC connectors shown in

Figure 2. For pinout diagrams and more specific information about

connecting signals, refer to the 660X User Manual.

©National Instruments Corporation 3 BNC-2121 Connector Accessory for 660X Devices

Figure 2. BNC-2121 Front Panel

1 Warning Label

2 PFI Line Spring Terminal

3 Quadrature Encoder Output

Spring Terminals

4 Digital Trigger Output Spring

Terminal

5 Frequency Output Spring

Terminal ()

6 +5 V Output Spring Terminal

7 GND Terminal

8 Quadrature Encoder Knob

9 Digital Trigger Button

10 Digital Trigger Filtering Switch

11 68-Position I/O Connector

12 Power LED Indicator

13 Digital Line LED State Indicator

14 BNC Connectors for

Counters 0 and 1

15 User-Defined BNC Connector

16 Spring Terminals for

User-Defined BNC Connectors

17 Frequency Selection Switch

18 Frequency Adjust Knob

19 Digital Trigger Line

LED State Indicator

PFI

DIGITAL I/O INDICATORS

P0.0

P0.2

P0.4

P0.6

P0.1

P0.3

P0.5

P0.7

P0.1

P0.3

GND

P0.5

P0.7

GND

SRC7

GND

UP/DN6

SRC6

GND

UP/DN5

SRC5

GND

UP/DN7

P0.0

P0.2

GND

P0.4

P0.6

GND

OUT7

GATE7

GND

OUT6

GATE6

GND

OUT5

GATE5

GND

PFI

OUT4

GATE4

GND

OUT3

GATE3

GND

OUT2

GATE2

GND

OUT1

GATE1

GND

OUT0

GATE0

RESERVE1

UP/DN4

SRC4

GND

UP/DN3

SRC3

GND

UP/DN2

SRC2

GND

UP/DN1

SRC1

GND

UP/DN0

SRC0

RESERVE2

PFI

PFI LINES 0-39

PWR

PFI LINES 32-39

USER DEFINED FUNCTIONS

OUT1

PFI 32

UP/DN1

PFI 33

SRC1

PFI 35

GATE1

PFI 34

OUT0

PFI 36

UP/DN0

PFI 37

SRC0

PFI 39

GATE0

PFI 38

10 Hz-200 Hz

150 Hz-20 kHz

14 kHz-1 MHz

Frequency

Selection

Frequency

Adjust

LO HI

( ) ( )

USER 1 USER 2

USER 4USER 3

USER 5 USER 6

Filtering

OFF ON

Digital Trigger (TRIGGER)

Quadrature Encoder

24 Pulses/rev (A,B)

ENCODER A

ENCODER B

TRIGGER

+5V

GND

USER 1

USER 2

USER 3

USER 4

USER 5

USER 6

Drive only one signal per PFI line

using either a BNC, a spring

terminal or the 660X device.

Electrostatic

Sensitive

Connectors

BNC-2121

PFI

BNC-2121 Connector Accessory for 660X Devices 4 ni.com

Overview of Connecting to the BNC-2121

The BNC-2121 has two main areas of connectivity: the PFI lines and the

user-defined functions.

The PFI lines include bidirectional spring terminals, PFI <0..39>, and

bidirectional BNC connectors, PFI <32..39>. Both connection types

provide access to the respective PFI lines on the 660Xdevice. The

digital I/O indicators reflect the state of the dedicated digital I/O P.<0..7>

spring terminals.

The user-defined function connections include the following:

• Six output spring terminals—Encoder A, Encoder B, Trigger,

Square Wave ( ), +5 V, and GND

• Controls for the outputs listed above—Quadrature Encoder, Digital

Trigger, Frequency Selection, and Frequency Adjust

Table 1 lists the controls and the outputs associated with them.

• Six bidirectional, user-defined spring terminals—USER <1..6>

• Six user-defined BNC connectors—USER <1..6>

Note The user-defined spring terminals are internally mapped one-to-one to

corresponding BNC connectors. For example, the USER 1 spring terminal is internally

wired to the USER 1 BNC connector. When you want BNC connections for counters other

than 0 or 1, use the user-defined connections.

Table 1. User-Defined Function Controls and the Corresponding Outputs

Controls Spring Terminal Outputs

Quadrature Encoder Knob Encoder A

Quadrature Encoder Knob Encoder B

Digital Trigger Button Trigger

Frequency Selection

Frequency Adjust

©National Instruments Corporation 5 BNC-2121 Connector Accessory for 660X Devices

Connecting to the Spring Terminals

Use the BNC-2121 connector accessory to access the PFI lines on a

660Xdevice.

To make the connection, complete the following steps.

1. Using wire strippers, strip the wire insulation no more than 7 mm.

2. Connect a wire to a spring terminal on the BNC-2121 by depressing

the orange tab and inserting the stripped end of the wire fully into the

terminal.

Tip For the best performance, use twisted-pair wire. Connect one wire of the wire pair

from the signal on the peripheral device and the other end of the same twisted wire to the

signal on the BNC-2121. Connect the other wire of the wire pair to the ground of the

peripheral device and the other end to the ground (GND) spring terminal closest to the

signal.

Caution Make sure that no bare wire extends past the spring terminal. Exposed wire

increases the risk of a short circuit or a failure.

3. If you need to ground a signal, a ground (GND) spring terminal is

available between every two PFI lines. For details about grounding a

signal, refer to the 660X User Manual.

The user-defined functions area of the BNC-2121 has six user-defined

spring terminals, USER <1..6>, and six corresponding BNC connectors,

USER <1..6>. Use these spring terminals for either input or output. For

example, if you want to connect a BNC cable to GATE of a counter other

than Counter 0 or 1, connect a wire from the GATE spring terminal on the

660Xdevice to a user-defined spring terminal (USER 1) on the BNC-2121,

and the signal is available through the corresponding BNC connector

(USER 1).

The six other spring terminals (ENCODER A, ENCODER B, TRIGGER,

, +5 V, and GND) are used as signal outputs only. Follow steps 1 and 2

in this section to connect the output wires to the appropriate spring

terminals. Use the corresponding controls for each spring terminal, given

in Table 1, to regulate a signal.

Connecting to the BNC Connectors

Use the eight BNC connectors to access PFI <32..39> on a 660Xdevice.

Each line corresponds to SOURCE, GATE, OUT, and UP/DOWN of

counter 0 or 1.

BNC-2121 Connector Accessory for 660X Devices 6 ni.com

To make the connection, complete the following steps.

1. Insert one end of the BNC cable in one of the PFI <32..39>

BNC connectors.

2. Connect the other end of the BNC cable to the output device.

In addition to the BNC connectors associated with the PFI lines of the

660Xdevice, the BNC-2121 has six user-defined BNC connectors,

USER <1..6>, that are associated with six corresponding user-defined

spring terminals USER <1..6>. You can use these BNC connectors for

either input or output.

Testing User-Defined Functions

You can use the BNC-2121 to test the following features on the

660Xdevice.

Producing a +5 V Pulse

Use the digital trigger to test an application that counts or measures pulses.

Press the Digital Trigger button to produce a +5 V pulse for as long as the

button is pressed, causing the LED to light up. When you release the button,

the trigger line goes low. You can access the digital trigger by connecting

a wire to the Trigger spring terminal. The digital trigger also can simulate

a channel Z pulse for quadrature encoder functions.

The lowpass filter on the BNC-2121 is designed to remove glitches on the

trigger output. If you want to use unconditional trigger output to test the

debouncing filter on a 660Xdevice, flip the Filtering switch to the OFF

position, connect the trigger output to a PFI line, and programmatically

enable the debouncing filter on the 660Xdevice. For all other applications,

flip the Filtering switch to the ON position.

Measuring Position

The BNC-2121 can produce 24 pulses per encoder revolution. You can test

this feature using the following programs.

• C interface—TIOquadEncoderPosMeasure.c located in

Program Files/National Instruments/Measurement

Studio/CVI/Samples/DAQ/Ctr

• LabVIEW—Measure Position VI located in Program Files/

National Instruments/LabVIEW/Examples/DAQ/Counter/

NI-TIO.llb

©National Instruments Corporation 7 BNC-2121 Connector Accessory for 660X Devices

To measure position using counter 0 of a 660Xdevice, make the following

connections.

1. Connect a wire from channel A to SOURCE of counter 0

(default PFI 39).

2. Connect a wire from channel B to UP/DOWN of counter 0

(default PFI 37).

Note If you want to simulate a Z channel, connect a wire from the Trigger spring terminal

to GATE of counter 0 (default PFI 38).

Creating a Square Wave

The BNC-2121 has a function generator that produces TTL-compatible

square waveforms.

To create a square wave, complete the following steps.

1. Access the square wave output by connecting signals to the spring

terminal.

2. Use the Frequency Selection switch to select a frequency range of

10 Hz–200 Hz, 150 Hz–20 kHz, or 14 kHz–1 MHz.

3. Adjust the frequency within the range you selected by turning the

Frequency Adjust knob.

Viewing the State of the DIO Lines

The eight Digital I/O indicators indicate the state of PFI <0..7> on a

660Xdevice. When the LED is lit, the channel is in the high state. When

the LED is off, the channel is in the low state.

Using the BNC-2121 to Perform Counter Applications

This section explains how to connect signals to the BNC-2121 to test,

demonstrate, and perform counter applications with a 660Xdevice. To find

the correct application to perform, refer to the 660X User Manual.

Counter program examples mentioned in this section are in the following

locations.

•NI-DAQ—

Measurement Studio\CVI\Samples\DAQ\Ctr

•LabVIEW—Program Files\National Instruments\

LabVIEW\Examples\DAQ\Counter\NI.TIO.llb

BNC-2121 Connector Accessory for 660X Devices 8 ni.com

Simple Event Counting

To perform simple event counting, connect a wire from the spring

terminal to SOURCE of the selected counter. The 660Xdevice counts the

number of pulses that occur on SOURCE.

Alternatively, you can connect a wire from the Trigger spring terminal to

provide pulses on SOURCE.

Gated Event Counting

To perform gated event counting, complete the following steps.

1. Connect a wire from the spring terminal to SOURCE of the

selected counter.

2. Connect a wire from the Trigger spring terminal to GATE of the

selected counter.

3. Press and hold the Digital Trigger button to drive GATE into a high

state. The counter counts the pulses on SOURCE as long as GATE is

high.

4. Release the Digital Trigger button to drive GATE into a low state. The

counting halts and retains its value until you press the Digital Trigger

button again and counting continues.

Single Period Measurement

To take a single period measurement, complete the following steps.

1. In the C interface or in LabVIEW, select an internal timebase as

SOURCE of the selected counter.

2. Connect a wire from the spring terminal to GATE of the selected

counter. The counter counts the rising edges on SOURCE between two

active GATE edges. The period is this count multiplied by the period

of SOURCE.

Single Pulse-Width Measurement

To take a single pulse-width measurement, complete the following steps.

1. In the C interface or in LabVIEW, select an internal timebase as

SOURCE of the selected counter.

2. Connect a wire from the Trigger spring terminal to GATE of the

selected counter.

3. Press the Digital Trigger button to drive GATE into a high state.

The counter counts the rising edges on SOURCE while GATE is

active.

4. Release the Digital Trigger button to drive GATE into a low state.

The counter value is latched for a software read.

©National Instruments Corporation 9 BNC-2121 Connector Accessory for 660X Devices

Two-Signal Edge-Separation Measurement

To take a two-signal edge-separation measurement, complete the following

steps.

1. Connect a wire from the spring terminal to UP/DOWN of the

selected counter.

2. In the C interface or in LabVIEW, select an internal timebase as

SOURCE of the selected counter. As soon as UP/DOWN goes active,

the counter counts the edges on SOURCE.

3. Connect a wire from the Trigger spring terminal to GATE of the

selected counter.

4. Press the Digital Trigger button to drive GATE into an active state.

As soon as GATE goes active, the counter value is latched for a

software read.

Note UP/DOWN and AUX_LINE share the same PFI line on all counters.

Single Pulse Generation

To generate a single pulse, complete the following steps.

1. In the C interface or in LabVIEW, select an internal timebase as

SOURCE of the selected counter.

2. Specify the pulse delay and pulse width in the C interface or

LabVIEW.

3. To see the signal, connect an oscilloscope or analog input device to

OUT of the selected counter.

Single-Triggered Pulse Generation

To generate a single-triggered pulse, complete the following steps.

1. In the C interface or in LabVIEW, select an internal timebase as

SOURCE of the selected counter.

2. Specify the pulse delay and pulse width in the C interface or

LabVIEW.

3. Connect a wire from the Trigger spring terminal to GATE of the

selected counter.

4. Press the Digital Trigger button to generate a single pulse. One pulse

is generated on OUT of the counter when the trigger is received.

5. To see the signal, connect an oscilloscope or analog input device to

OUT of the selected counter.

BNC-2121 Connector Accessory for 660X Devices 10 ni.com

Retriggerable Single Pulse Generation

To generate a retriggerable single pulse, complete the following steps.

1. In the C interface or in LabVIEW, select an internal timebase as

SOURCE of the selected counter.

2. Specify the pulse delay and pulse width in the C interface or

LabVIEW.

3. Connect a wire from the Trigger spring terminal to GATE of the

selected counter.

4. Press the Digital Trigger button to generate a pulse. Any time you

want an additional pulse, press the Digital Trigger button to generate

a pulse on OUT of the counter.

Note A pulse is generated on every active GATE edge.

5. To see the signal, connect an oscilloscope or analog input device to

OUT of the selected counter.

Continuous Pulse-Train Generation

To generate a continuous pulse-train, complete the following steps.

1. In the C interface or in LabVIEW, select an internal timebase as

SOURCE of the selected counter.

2. In the C interface or in LabVIEW, specify the frequency and duty cycle

of the pulse train.

3. To see the signal, connect an oscilloscope or analog input device to

OUT of the selected counter.

Frequency Shift-Keying

To perform frequency shift-keying, complete the following steps.

1. In the C interface or in LabVIEW, select an internal timebase as

SOURCE of the selected counter.

2. Connect a wire from the Trigger spring terminal to GATE of the

selected counter.

3. Press the Digital Trigger button to drive GATE into a high state.

4. Release the Digital Trigger button to drive GATE into a low state.

5. To see the signal, connect an oscilloscope or analog input device to

OUT of the selected counter.

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