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NI USB-9421 User Guide and Specifications

6

ni.com

ANSI C without NI Application Software

The 

NI-DAQmx Help

 contains API overviews and general information 

about measurement concepts. Select 

Start»All Programs»National 

Instruments»NI-DAQ»NI-DAQmx Help

.

The 

NI-DAQmx C Reference Help

 describes the NI-DAQmx Library 

functions, which you can use with National Instruments data acquisition 
devices to develop instrumentation, acquisition, and control applications. 
Select 

Start»All Programs»National Instruments»NI-DAQ»

NI-DAQmx C Reference Help

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.NET Languages without NI Application Software

With the Microsoft .NET Framework version 1.1 or later, you can use 
NI-DAQmx to create applications using Visual C# and Visual Basic 
.NET without Measurement Studio. You need Microsoft Visual Studio 
.NET 2003 or Microsoft Visual Studio 2005 for the API documentation 
to be installed.

The installed documentation contains the NI-DAQmx API overview, 
measurement tasks and concepts, and function reference. This help is fully 
integrated into the Visual Studio .NET documentation. To view the 
NI-DAQmx .NET documentation, go to 

Start»Programs»National 

Instruments»NI-DAQ»NI-DAQmx .NET Reference Help

. Expand 

NI Measurement Studio Help»NI Measurement Studio .NET Class 
Library»Reference

 to view the function reference. Expand 

NI 

Measurement Studio Help»NI Measurement Studio .NET Class 
Library»Using the Measurement Studio .NET Class Libraries

 to view 

conceptual topics for using NI-DAQmx with Visual C# and Visual Basic 
.NET.

To get to the same help topics from within Visual Studio, go to 

Help»Contents

. Select 

Measurement Studio

 from the 

Filtered By

 

drop-down list and follow the previous instructions.

Device Documentation and Specifications

NI-DAQmx includes the Device Document Browser, which contains 
online documentation for supported DAQ, SCXI, and switch devices, such 
as help files describing device pinouts, features, and operation, and PDF 
files of the printed device documents. You can find, view, and/or print the 
documents for each device using the Device Document Browser at any 
time by inserting the CD. After installing the Device Document Browser, 
device documents are accessible from 

Start»All Programs»National 

Instruments»NI-DAQ»Browse Device Documentation

.

Note

You can download these documents at 

ni.com/manuals

.

Содержание USB-9421

Страница 1: ...9421 with D SUB are referred to inclusively as the NI USB 9421 Introduction The NI USB 9421 data acquisition device provides a USB interface with connections for eight digital input channels The NI U...

Страница 2: ...illimeters Inches Figure 3 NI USB 9421 D SUB Device in Millimeters Inches Hi Speed USB Carrier NI USB 9162 140 23 mm 5 521 in 137 82 mm 5 426 in 120 68 mm 4 751 in 118 26 mm 4 656 in 88 12 mm 3 469 in...

Страница 3: ...f or the area is known to be nonhazardous Caution The NI USB 9421 is not certified for use in hazardous locations Safety Guidelines for Hazardous Voltages If hazardous voltages are connected to the mo...

Страница 4: ...nts Select Start All Programs National Instruments NI DAQ NI DAQmx Help LabVIEW If you are a new user use the Getting Started with LabVIEW manual to familiarize yourself with the LabVIEW graphical pro...

Страница 5: ...Visual Basic NET you can interactively create channels and tasks by launching the DAQ Assistant from MAX or from within Visual Studio NET You can generate the configuration code based on your task or...

Страница 6: ...entation To view the NI DAQmx NET documentation go to Start Programs National Instruments NI DAQ NI DAQmx NET Reference Help Expand NI Measurement Studio Help NI Measurement Studio NET Class Library R...

Страница 7: ...sing other software refer to the installation instructions that accompany your software Example Programs The NI DAQmx CD contains example programs that you can use to get started programming with the...

Страница 8: ...Figure 4 Module Installation 4 Squeeze the latches and insert the NI 9421 module into the NI USB 9162 carrier 5 Press firmly on the connector side of the NI 9421 module until the latches lock the modu...

Страница 9: ...for more information LED Indicator The NI USB 9421 device has a green LED next to the USB connector The LED indicator indicates device status as listed in Table 1 When the device is connected to a US...

Страница 10: ...evice not connected or in suspend On not blinking Device connected but no module installed Single blink Operating normally Double blink Operating normally Quadruple blink Device error Refer to ni com...

Страница 11: ...connected to the isolated reference of the module Each digital input channel on the NI USB 9421 has an LED that indicates the state of that channel Refer to Table 3 for the terminal assignments of the...

Страница 12: ...protection refer to the Specifications section You can connect 2 3 and 4 wire sourcing output devices to the NI USB 9421 A sourcing output device drives current or applies voltage to DI An example of...

Страница 13: ...s OFF The channel LED turns on and off to indicate the state of the channel Refer to the Specifications section for more information about ON and OFF ranges Assembling the High Voltage Screw Terminal...

Страница 14: ...ve to COM unless otherwise noted Input Characteristics Number of channels 8 Input type Sinking Digital logic levels OFF state Input voltage 5 V Input current 300 A ON state Input voltage 11 to 30 V In...

Страница 15: ...ith D SUB Approx 245 g 8 6 oz Safety If you need to clean the module wipe it with a dry towel Safety Voltages NI USB 9421 with Screw Terminal Safety Voltages Connect only voltages that are within thes...

Страница 16: ...e measurements include signal levels special equipment limited energy parts of equipment circuits powered by regulated low voltage sources and electronics Safety Standards The NI USB 9421 is designed...

Страница 17: ...arking as follows 2006 95 EC Low Voltage Directive safety 2004 108 EC Electromagnetic Compatibility Directive EMC Note Refer to the Declaration of Conformity DoC for this product for any additional re...

Страница 18: ...00 North Mopac Expressway Austin Texas 78759 3504 National Instruments also has offices located around the world to help address your support needs For telephone support in the United States create yo...

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