National Instruments 8-Channel, User's Manual
Contents
1. 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 DAQm x 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 NJ Measurement Studio Help For general help with programming in Measurement Studio2. refer to the NJ 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 gt 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 5 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 DAQm x 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 DAQm x C Reference Help NET Languages without NI Application Software With the Microsoft INET 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 docu
3. 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 1legal for more information about National Instruments trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents 2005 2007 National Instruments Corporation All rights reserved 371606D 01 Dec07
4. from ni com for use with the NI USB 9421 Table 2 Accessories Device Accessory Accessory Description USB 9421 with Screw Terminal NI 9932 10 terminal detachable high voltage screw terminal backshell USB 9421 with 25 pin D SUB NI 9934 25 pin D SUB connector section 1 For more information about installing the backshell refer to the Assembling the High Voltage Screw Terminal Backshell NI USB 9421 User Guide and Specifications 10 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 r S 0 DIO og 1 Dil 49 2 DI2 3 DB i 4 DI4 3 4 5 DI5 5 a SH S 6 DI6 JIES 7 DI7 9 S WS 8 No connection 9 Common COM National Instruments Corporation 11 NI USB 9421 User Guide an
5. HS RAZA National Instruments 444 E e TAR Ar m P ERNEA EEA EIS ROHS KF National Instruments Y El ROHS AHA WK ni com environment rohs_china For information about China RoHS compliance go to ni com environment rohs_china 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
6. Qmx concepts and common applications that are applicable to all programming environments Select Start All Programs National Instruments NI DAQ NI DAQm x Help 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 e 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 e VI and Function Reference Measurement I O VIs and Functions Describes the Lab VIEW NI DAQm x VIs and properties NI USB 9421 User Guide and Specifications 4 ni com e Taking Measurements Contains the conceptual and how to information you need to acquire and analyze measurement data in
7. arted 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 DAQm x installed on it and the computer is not in standby mode National Instruments Corporation 9 NI USB 9421 User Guide and Specifications Table 1 LED State Device Status LED State Device Status Not lit Device 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 support Wiring the NI USB 9421 Device UN Caution A high voltage screw terminal backshell must be installed when using hazardous voltages gt 42 4 V x 60 VDC ays Note Table 2 illustrates the accessories available
8. d Specifications 1 COM DIO 14 2 NC NC 15 3 COM DI 16 4 COM DI2 17 5 NC NC 18 6 COM DIS 19 7 COM DI4 20 8 NC NC 21 9 COM DI5 22 10 COM DI6 23 11 NC NC 24 DIT 25 12 COM 13 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 12 ni com Sourcing Output Device hee Se eee anGae pr DI External oO Power i Supply T COM NI USB 9421 Figure 8 Connecting a Device to the NI USB 9421 3 Wire Device Shown The NI USB 9421 c
9. ee USER GUIDE AND SPECIFICATIONS NI USB 9421 8 Channel 24 V Logic Sinking Digital Input Device COKFAAY KOBABRIZDUYTIZ ni com manuals ZELT lt ESL For a Japanese language version go toni com manuals 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 USB 9421 Figure 1 NI USB 9421 Components 7 NATIONAL p INSTRUMENTS Dimensions Figures 2 and 3 show the NI USB 9421 device dimensions A A Senseo INSTRUMENTS d 0 fe Hi Speed IUSR Carmer 140 23 mm 120 68 mm a 5 521 in 4 751 in 2 137 82 mm 118 26 mm 5 426 in 4 656 in rq aoe vo E Dun AE TEE Ege 88 12 mm 25 34 mm i 3 469 in i f 0 998 in Figure 2 NI USB 9421 Screw Terminal Device in Millimeters Inches A ii Aoa FA NATIONAL Minstr
10. ering 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 3 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 LabVIEW 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 DA
11. gic levels OFF state Input voltage lt 5 V Input current s src lt 300 uA ON state Input voltage eee 11 to 30 V Input current sses 23 mA T O protection Input voltage eee eeeeeeeeeeee 40 V max Reverse biased voltage 30 V max Input Current eee eeeeeeseeeeeeeees 7 mA max internally limited Input delay time 00 eee eeeeeeeeeee 100 us max Power Requirements Power consumption from USB 500 mA max Suspend mode cceeeeseeseeeeeeeeaee 2 5 mA max NI USB 9421 User Guide and Specifications 14 ni com Bus Interface USB specification n se USB 2 0 Hi Speed Physical Characteristics Dimensions With screw terminal eee 14 0 cm x 8 8 cm x 2 5 cm 5 52 in x 3 47 in x 1 00 in With 25 pin D SUB 12 6 cm x 8 8 cm x 2 5 cm 4 95 in x 3 47 in x 1 00 in Screw terminal Wiring eee 12 to 24 AWG copper conductor wire with 10 mm 0 39 in of insulation stripped from the end Torque for screw terminals 0 0 5 0 6 N m 4 4 5 3 lb in Weight With screw terminal eee Approx 250 g 8 8 0z With D SUB sinensis Approx 245 g 8 6 0z 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 oeer 30 V max Isolation Channel to channel 0 0 008 No isolation between channels Channel to eart
12. h ground Withstand ee eeeeeseeseeeeees 2 300 Vms verified by a 5 second dielectric withstand test Continuous ceeeeeeeeeeeeeeees 250 Vms Measurement Category IIT 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 15 NI USB 9421 User Guide and Specifications NI USB 9421 with D SUB Safety Voltages Channel to COM l 30 V max Isolation Channel to channel cccce No isolation between channels Channel to earth ground Withstand csscssvesenciversestivetaees 1 000 Vms verified by a 5 second dielectric withstand test COntinUOusS cccceeeeeeseeeeeeees 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
13. hannel 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 gt 42 4 V 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 S lt lt gt tt 1 1 1 my 1 1 i LA 1 Strain Relief Figure 9 High Voltage Screw Terminal Backshell National Instruments Corporation 13 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 e ceeceeseeeseeees 8 JOput types nities inc dina es Sinking Digital lo
14. mentation 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 DA Q Browse Device Documentation 3 Note You can download these d
15. ocuments at ni com manuals NI USB 9421 User Guide and Specifications 6 ni com 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 NJ 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 Ins
16. of the following standards of safety for electrical equipment for measurement control and laboratory use e TEC 61010 1 EN 61010 1 e UL61010 1 CSA 61010 1 3 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 n n 40 to 85 C NI USB 9421 User Guide and Specifications 16 ni com Operating humidity TEC 60068 2 56 eeecceeeescesesteeeeteeeees 10 to 90 RH noncondensing Storage humidity TEC 60068 2 56 eecceeeeseeeesteceeteeeees 5 to 95 RH noncondensing Maximum altitude cccccececceeeeeeees 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 e EN 61326 EMC requirements Minimum Immunity e EN 55011 Emissions Group 1 Class A e CE C Tick ICES and FCC Part 15 Emissions Class A 3 Note For EMC compliance operate this device with double shielded cables CE Compliance This p
17. roduct meets the essential requirements of applicable European Directives as amended for CE marking as follows e 2006 95 EC Low Voltage Directive safety e 2004 108 EC Electromagnetic Compatibility Directive EMC 3 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 17 NI USB 9421 User Guide and Specifications Ix 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 BAS ise hl SDE CAE RO
18. talling 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 7 NI USB 9421 User Guide and Specifications 3 Align the I O module with the carrier as shown in Figure 4 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 8 ni com 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 lt 3 37 in g i 72 2 mm i esain 7 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 St
19. uments a Hi Spead USR Carrier 125 76 mm 120 68 mm mm 4 951 in 4 751 in i 123 38 mm 118 26 mm 4 857 in 4 656 in 2 ji A 1 D Lee Y 35 l i TT 88 12 mm i 25 34 mm Da 3 469 in gt i 0 998 in Figure 3 NI USB 9421 D SUB Device in Millimeters Inches NI USB 9421 User Guide and Specifications 2 ni com Safety Guidelines 3 A A A A 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 gt bP BP pP If hazardous voltages are connected to the module take the following precautions A hazardous voltage is a voltage greater than 42 4 V or 60 VDC to earth ground Caution Ensure that hazardous voltage wiring is performed only by qualified personnel adh
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