National Instruments Computer Hardware 8 Channel 24 V Logic Sinking Digital Input Device User Manual

USER GUIDE AND SPECIFICATIONS  
NI USB-9421  
8-Channel, 24 V Logic, Sinking Digital Input Device  
This user guide describes how to use the National Instruments USB-9421  
and lists the device specifications. In this user guide, the NI USB-9421 with  
screw terminal and the NI USB-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 USB-9421 consists  
of two components: an NI 9421 module and an NI USB-9162 carrier,  
as shown in Figure 1.  
NI 9421  
H i - S p e e d U S B  
N
I
U
S
B - 9 1 6 2  
NI USB-9162  
C a r r i e r  
H i - S P  
N
I
U S  
e e d U S B C a r r i e  
B - 9 1 6 2  
r
NI USB-9421  
Figure 1. NI USB-9421 Components  
 
 
Safety Guidelines  
Operate the NI USB-9421 only as described in these operating instructions.  
Note Although the NI 9421 module may have more stringent certification standards than  
the NI USB-9421, when used with the NI USB-9162 carrier, the combined system may be  
limited. Refer to the Specifications section for more details.  
Hot Surface This icon denotes that the component may be hot. Touching this component  
may result in bodily injury.  
Caution Do not disconnect I/O-side wires or connectors unless power has been switched  
off or the area is known to be nonhazardous.  
Caution Do not remove modules unless power has been switched off 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 module, take the following  
precautions. A hazardous voltage is a voltage greater than 42.4 Vpk or  
60 VDC to earth ground.  
Caution Ensure that hazardous voltage wiring is performed only by qualified personnel  
adhering to local electrical standards.  
Caution Do not mix hazardous voltage circuits and human-accessible circuits on the same  
module.  
Caution Make sure that devices and circuits connected to the module are properly  
insulated from human contact.  
Caution When module terminals are live with hazardous voltages, make sure that the  
terminals are not accessible by using the high voltage screw terminal backshell. Refer to  
the Assembling the High Voltage Screw Terminal Backshell section for more information.  
© National Instruments Corporation  
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NI USB-9421 User Guide and Specifications  
 
Related Documentation  
Each application software package and driver includes information about  
writing applications for taking measurements and controlling measurement  
devices. The following references to documents assume you have  
NI-DAQmx 8.7 or later, and where applicable, version 7.1 or later of the  
NI application software.  
NI-DAQmx for Windows  
The DAQ Getting Started Guide describes how to install your NI-DAQmx  
for Windows software, your NI-DAQmx-supported DAQ device, and how  
to confirm that your device is operating properly. Select Start»All  
Programs»National Instruments»NI-DAQ»DAQ Getting Started  
Guide.  
The NI-DAQ Readme lists which devices are supported by this version of  
NI-DAQ. Select Start»All Programs»National Instruments»NI-DAQ»  
NI-DAQ Readme.  
The NI-DAQmx Help contains general information about measurement  
concepts, key NI-DAQmx concepts, and common applications that are  
applicable to all programming environments. 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 programming  
environment and the basic LabVIEW features you use to build data  
acquisition and instrument control applications. Open the Getting Started  
with LabVIEW manual by selecting Start»All Programs»National  
Instruments»LabVIEW»LabVIEW Manuals or by navigating to the  
labview\manuals directory and opening LV_Getting_Started.pdf.  
Use the LabVIEW Help, available by selecting Help»Search the  
LabVIEW Help in LabVIEW, to access information about LabVIEW  
programming concepts, step-by-step instructions for using LabVIEW, and  
reference information about LabVIEW VIs, functions, palettes, menus, and  
tools. Refer to the following locations on the Contents tab of the LabVIEW  
Help for information about NI-DAQmx:  
Getting Started»Getting Started with DAQ—Includes overview  
information and a tutorial to learn how to take an NI-DAQmx  
measurement in LabVIEW using the DAQ Assistant.  
VI and Function Reference»Measurement I/O VIs and  
Functions—Describes the LabVIEW NI-DAQmx VIs and properties.  
NI USB-9421 User Guide and Specifications  
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ni.com  
 
Taking Measurements—Contains the conceptual and how-to  
information you need to acquire and analyze measurement data in  
LabVIEW, including common measurements, measurement  
fundamentals, NI-DAQmx key concepts, and device considerations.  
LabWindows/CVI  
The Data Acquisition book of the LabWindows/CVI Help contains  
measurement concepts for NI-DAQmx. This book also contains Taking  
an NI-DAQmx Measurement in LabWindows/CVI, which includes  
step-by-step instructions about creating a measurement task using the DAQ  
Assistant. In LabWindows/CVI, select Help»Contents, then select  
Using LabWindows/CVI»Data Acquisition.  
The NI-DAQmx Library book of the LabWindows/CVI Help contains  
API overviews and function reference for NI-DAQmx. Select Library  
Reference»NI-DAQmx Library in the LabWindows/CVI Help.  
Measurement Studio  
If you program your NI-DAQmx-supported device in Measurement Studio  
using Visual C++, Visual C#, or 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 channel in Measurement Studio. Refer to the DAQ  
Assistant Help for additional information about generating code. You also  
can create channels and tasks, and write your own applications in your  
ADE using the NI-DAQmx API.  
For help with NI-DAQmx methods and properties, refer to the NI-DAQmx  
.NET Class Library or the NI-DAQmx Visual C++ Class Library included  
in the NI Measurement Studio Help. For general help with programming in  
Measurement Studio, refer to the NI Measurement Studio Help, which is  
fully integrated with the Microsoft Visual Studio .NET help. To view  
this help file in Visual Studio. NET, select Measurement Studio»  
NI Measurement Studio Help.  
To create an application in Visual C++, Visual C#, or Visual Basic .NET,  
follow these general steps:  
1. In Visual Studio .NET, select File»New»Project to launch the New  
Project dialog box.  
2. Find the Measurement Studio folder for the language you want to  
create a program in.  
3. Choose a project type. You add DAQ tasks as a part of this step.  
© National Instruments Corporation  
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NI USB-9421 User Guide and Specifications  
 
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.  
.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.  
NI USB-9421 User Guide and Specifications  
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Training Courses  
If you need more help getting started developing an application with NI  
products, NI offers training courses. To enroll in a course or obtain a  
detailed course outline, refer to ni.com/training.  
Technical Support on the Web  
For additional support, refer to ni.com/support or zone.ni.com.  
Installing the Software  
Software support for the NI USB-9421 for Windows Vista/XP/2000 is  
provided by NI-DAQmx. The DAQ Getting Started Guide, which you can  
download at ni.com/manuals, offers NI-DAQmx users step-by-step  
instructions for installing software and hardware, configuring channels and  
tasks, and getting started developing an application.  
Installing Other Software  
If you are using 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 NI USB-9421. Refer to the NI-DAQmx for  
USB Devices Getting Started Guide that shipped with your device, and  
is also accessible from Start»All Programs»National Instruments»  
NI-DAQ, for more information.  
Installing the NI USB-9421 Device  
Before installing the device, you must install the software you plan to use  
with the device. Refer to the Installing the Software section of this guide  
and the documentation included with the software for more information.  
Installing the NI 9421 in the NI USB-9162 Carrier  
The NI 9421 module and NI USB-9162 carrier are packaged separately.  
Refer to Figure 4, while completing the following assembly steps:  
1. Make sure that no signals are connected to the NI 9421 module.  
2. Remove the protective cover from the 15-pin D-SUB connector.  
© National Instruments Corporation  
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NI USB-9421 User Guide and Specifications  
 
 
3. Align the I/O module with the carrier, as shown in Figure 4.  
1
1
High Voltage Screw Terminal Backshell  
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 module into place, as shown in Figure 5.  
Figure 5. Locking Module into Place  
NI USB-9421 User Guide and Specifications  
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Mounting the NI USB-9421 to a Panel  
Threaded inserts are located in the NI USB-9421 for mounting it to a panel.  
Refer to Figure 6 for dimensions.  
85.7 mm  
(3.37 in.)  
72.2 mm  
(2.84 in.)  
Threaded Insert  
M3 x 0.5  
8.5 mm (0.34 in.) Max Depth  
76.1 mm  
(3.00 in.)  
Figure 6. Module Dimensions in Millimeters (Inches)  
Connecting the NI USB-9421 to a Computer  
Plug one end of the USB cable into the NI USB-9421 and the other end into  
an available USB port on the computer. Refer to the NI-DAQmx for USB  
Devices Getting Started Guide that shipped with your device, and is also  
accessible from Start»All Programs»National Instruments»NI-DAQ,  
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 USB port, the LED blinks steadily to indicate that the  
device is initialized and is receiving power from the connection.  
If the LED is not blinking, it may mean that the device is not initialized or  
the computer is in standby mode. In order for the device to be recognized,  
the device must be connected to a computer that has NI-DAQmx installed  
on it. If your device is not blinking, make sure your computer has the latest  
version of NI-DAQmx installed on it, and the computer is not in standby  
mode.  
© National Instruments Corporation  
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NI USB-9421 User Guide and Specifications  
 
 
Table 1. LED State/Device Status  
LED State  
Not lit  
Device Status  
Device not connected or in suspend.  
Device connected, but no module installed.  
Operating normally.  
On, not blinking  
Single-blink  
Double-blink  
Operating normally.  
Quadruple-blink  
Device error. Refer to ni.com/support.  
Caution A high voltage screw terminal backshell must be installed when using hazardous  
voltages (>42.4 Vpk, 60 VDC).  
Note Table 2 illustrates the accessories available from ni.com for use with the  
NI USB-9421.  
Table 2. Accessories  
Device  
Accessory  
USB-9421 with Screw Terminal  
NI 9932  
10-terminal, detachable, high  
voltage, screw terminal backshell1  
USB-9421 with 25-pin D-SUB  
NI 9934  
25-pin D-SUB connector  
1 For more information about installing the backshell, refer to the Assembling the High Voltage Screw Terminal Backshell  
section.  
NI USB-9421 User Guide and Specifications  
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ni.com  
 
   
Each channel of the NI USB-9421 has a terminal or pin, DI, to which you  
can connect voltage or current signals. The NI USB-9421 also has a  
common terminal or pin, COM, that is internally 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 NI USB-9421 with screw terminal. Refer to  
Figure 7 for the pin assignments of the NI USB-9421 with D-SUB.  
Table 3. Terminal Assignments  
Module  
Terminal  
Signal  
0
1
2
3
4
5
6
7
8
9
DI0  
0
3
DI1  
4
7
DI2  
0
1
2
3
4
5
6
7
8
9
DI3  
DI4  
DI5  
DI6  
DI7  
No connection  
Common (COM)  
© National Instruments Corporation  
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NI USB-9421 User Guide and Specifications  
 
 
0
4
3
7
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
COM  
NC  
COM  
COM  
NC  
COM  
COM  
NC  
COM  
COM  
NC  
DI0  
NC  
DI1  
DI2  
NC  
DI3  
DI4  
NC  
DI5  
DI6  
NC  
DI7  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
COM  
COM  
Figure 7. Pin Assignments  
Connecting Devices to the NI USB-9421  
The NI USB-9421 has sinking inputs, meaning that when current goes  
through or voltage is applied to the DI terminal or pin, DI provides a path  
to ground for the current or voltage. The NI USB-9421 internally limits  
current signals connected to DI. For more information about input current  
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 a sourcing-output device is a PNP open collector.  
Connect the output of the sourcing-output device to DI on the  
NI USB-9421. Connect the common of the external device to the COM  
terminal or pin. Figure 8 shows a possible configuration.  
NI USB-9421 User Guide and Specifications  
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ni.com  
 
 
Sourcing-Output  
Device  
DI  
External  
Power  
Supply  
+
_
NI USB-9421  
COM  
Figure 8. Connecting a Device to the NI USB-9421 (3-Wire Device Shown)  
The NI USB-9421 channel registers as ON when the sourcing-output  
device applies a voltage or drives a current to DI that is in the input ON  
range. The channel registers as OFF when the device applies a voltage or  
drives a current to DI that is in the input OFF range. If no device is  
connected to DI, the channel registers as 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 Backshell  
The NI 9932 high voltage screw terminal backshell must be installed when  
using hazardous voltages (>42.4 Vpk, 60 VDC). Refer to Figure 9 while  
completing the following steps to assemble the backshell:  
1. Connect the leads to the screw terminal and secure with the strain  
relief.  
2. Finish by snapping the backshell around the connector.  
1
1
Strain Relief  
Figure 9. High Voltage Screw Terminal Backshell  
© National Instruments Corporation  
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NI USB-9421 User Guide and Specifications  
 
     
Figure 10. Assembled High Voltage Screw Terminal Backshell  
Specifications  
The following specifications are typical for the range 0 to 60 °C unless  
otherwise noted. All voltages are relative 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 μA  
ON state  
Input voltage.............................11 to 30 V  
Input current.............................≥3 mA  
I/O protection  
Input voltage....................................40 V max  
Reverse biased voltage ....................–30 V max  
Input current ....................................7 mA max, internally limited  
Input delay time......................................100 μs max  
Power Requirements  
Power consumption from USB...............500 mA, max  
Suspend mode..................................2.5 mA, max  
NI USB-9421 User Guide and Specifications  
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Bus Interface  
Physical Characteristics  
USB specification .................................. USB 2.0 Hi-Speed  
Dimensions  
With screw terminal........................ 14.0 cm × 8.8 cm × 2.5 cm  
(5.52 in. × 3.47 in. × 1.00 in.)  
With 25-pin D-SUB........................ 12.6 cm × 8.8 cm × 2.5 cm  
(4.95 in. × 3.47 in. × 1.00 in.)  
Screw-terminal wiring............................ 12 to 24 AWG copper conductor  
wire with 10 mm (0.39 in.) of  
insulation stripped from the end  
Torque for screw terminals .................... 0.5 – 0.6 N · m (4.4 – 5.3 lb · in.)  
Weight  
With screw terminal........................ Approx. 250 g (8.8 oz)  
With 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 these limits.  
Channel-to-COM ................................... 30 V max  
Isolation  
Channel-to-channel......................... No isolation between channels  
Channel-to-earth ground  
Withstand................................. 2,300 Vrms, verified by a 5 second  
dielectric withstand test  
Continuous............................... 250 Vrms  
,
Measurement Category II  
Measurement Category II is for measurements performed on circuits  
directly connected to the electrical distribution system. This category refers  
to local-level electrical distribution, such as that provided by a standard  
wall outlet (for example, 115 V for U.S. or 230 V for Europe).  
© National Instruments Corporation  
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NI USB-9421 User Guide and Specifications  
 
NI USB-9421 with D-SUB Safety Voltages  
Channel-to-COM....................................30 V max  
Isolation  
Channel-to-channel..........................No isolation between channels  
Channel-to-earth ground  
Withstand .................................1,000 Vrms, verified by a 5 second  
dielectric withstand test  
Continuous ...............................60 VDC,  
Measurement Category I  
Measurement Category I is for measurements performed on circuits not  
directly connected to the electrical distribution system referred to as  
MAINS voltage. MAINS is a hazardous live electrical supply system that  
powers equipment. This category is for measurements of voltages from  
specially protected secondary circuits. Such voltage 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 to meet the requirements of the following  
standards of safety for electrical equipment for measurement, control,  
and laboratory use:  
IEC 61010-1, EN-61010-1  
UL 61010-1, CSA 61010-1  
Note For UL and other safety certifications, refer to the product label or visit  
ni.com/certification, search by model number or product line, and click the  
appropriate link in the Certification column.  
Hazardous Locations  
The NI USB-9421 is not certified for use in hazardous locations.  
Environmental  
The NI USB-9421 is intended for indoor use only.  
Operating temperature  
(IEC60068-2-1, IEC 60068-2-2) ............0 to 60 °C  
Storage temperature  
(IEC60068-2-1, IEC 60068-2-2) ............–40 to 85 °C  
NI USB-9421 User Guide and Specifications  
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Operating humidity  
(IEC 60068-2-56)................................... 10 to 90% RH, noncondensing  
Storage humidity  
(IEC 60068-2-56)................................... 5 to 95% RH, noncondensing  
Maximum altitude.................................. 2,000 m  
Pollution Degree (IEC 60664) ............... 2  
Electromagnetic Compatibility  
This product is designed to meet the requirements of the following  
standards of EMC for electrical equipment for measurement, control,  
and laboratory use:  
EN 61326 EMC requirements; Minimum Immunity  
EN 55011 Emissions; Group 1, Class A  
CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A  
Note For EMC compliance, operate this device with double-shielded cables.  
CE Compliance  
This product meets the essential requirements of applicable European  
Directives, as amended for CE marking, 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  
regulatory compliance information. To obtain the DoC for this product, visit  
ni.com/certification, search by model number or product line, and click the  
appropriate link in the Certification column.  
Environmental Management  
National Instruments is committed to designing and manufacturing  
products in an environmentally responsible manner. NI recognizes that  
eliminating certain hazardous substances from our products is beneficial  
not only to the environment but also to NI customers.  
For additional environmental information, refer to the NI and the  
Environment Web page at ni.com/environment. This page contains the  
environmental regulations and directives with which NI complies, as well  
as other environmental information not included in this document.  
© National Instruments Corporation  
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NI USB-9421 User Guide and Specifications  
 
Waste Electrical and Electronic Equipment (WEEE)  
EU Customers At the end of their life cycle, all products must be sent to a WEEE recycling  
center. For more information about WEEE recycling centers and National Instruments  
WEEE initiatives, visit ni.com/environment/weee.htm.  
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Where to Go for Support  
The National Instruments Web site is your complete resource for technical  
support. At ni.com/support you have access to everything from  
troubleshooting and application development self-help resources to email  
and phone assistance from NI Application Engineers.  
National Instruments corporate headquarters is located at  
11500 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 your service request at ni.com/support and follow the calling  
instructions or dial 512 795 8248. For telephone support outside the United  
States, contact your local branch office:  
Australia 1800 300 800, Austria 43 662 457990-0,  
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,  
Canada 800 433 3488, China 86 21 5050 9800,  
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,  
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,  
Germany 49 89 7413130, India 91 80 41190000, Israel 972 3 6393737,  
Italy 39 02 41309277, Japan 0120-527196, Korea 82 02 3451 3400,  
Lebanon 961 (0) 1 33 28 28, Malaysia 1800 887710,  
Mexico 01 800 010 0793, Netherlands 31 (0) 348 433 466,  
New Zealand 0800 553 322, Norway 47 (0) 66 90 76 60,  
Poland 48 22 3390150,Portugal 351 210 311 210,Russia 7 495 783 6851,  
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,  
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,  
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,  
Taiwan 886 02 2377 2222, Thailand 662 278 6777,  
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 52354  
National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation.  
Refer to the Terms of Use section on ni.com/legal for more information about National  
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names of their respective companies. For patents covering National Instruments products, refer to the  
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© 2005–2007 National Instruments Corporation. All rights reserved.  
371606D-01  
Dec07  
 

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