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National Instruments NI USB-9421 - page 1
USER GUIDE AND SPECIFICATIONS NI USB-9421 8-Channel, 24 V Logic, Si nking Digital Input Device This user guide describes how to use the National Instruments USB-9421 and lists the de vice specifications. In th is user guide, the NI USB-9421 with screw terminal and the NI USB-94 21 with D-SUB are referred to inclusi vely as the NI USB-9421 . Introdu ...
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National Instruments NI USB-9421 - page 2
NI USB-9421 U ser Guide and Specifications 2 ni.com Dimensions Figures 2 and 3 sho w the NI USB-9421 device dimensions. Figure 2. NI USB-9421 (Screw T erminal) Device in Millimeters (Inches) Figure 3. NI USB-9421 (D-SUB) Device in Millimeters (Inches) Hi- S peed U S B Carrier NI U S B-9162 140.23 mm (5.521 in.) 137.82 mm (5.426 in.) 120.68 mm (4.75 ...
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National Instruments NI USB-9421 - page 3
© National Instruments Corporation 3 NI USB-9421 User Guid e and Specifications Safety Guidelines Operate the NI USB-9421 on ly as described in thes e 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 m ay be li ...
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National Instruments NI USB-9421 - page 4
NI USB-9421 U ser Guide and Specifications 4 ni.com Related Documentation Each application software package an d driv er includes inform ation about writing applications for taking measur ements and controlling measurement devices. The follo wing references to documents assume you have NI-D A Qmx 8.7 or later, and where applicable, v ersion 7.1 or ...
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National Instruments NI USB-9421 - page 5
© National Instruments Corporation 5 NI USB-9421 User Guid e and Specifications • T aking Measurements —Contains the conceptual and how-to information you need to acquire and analyze measurement data in LabVIEW , including common measurements, measurement fundamentals, NI-DA Qmx key concepts, and device considerations. LabWindows/CVI The Data ...
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National Instruments NI USB-9421 - page 6
NI USB-9421 U ser Guide and Specifications 6 ni.com ANSI C without NI Application Software The NI-D A Qmx Help contains API ov erviews and general information about measurement concepts. Select Start»All Programs»National Instruments»NI-D A Q»NI-DA Qmx Help . The NI-D A Qm x C Refer ence Help describes the NI-D A Qmx Library functions, which yo ...
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National Instruments NI USB-9421 - page 7
© National Instruments Corporation 7 NI USB-9421 User Guid e and Specifications T raining Courses If you need more help getting started developing an appli cation with NI products, NI offers training courses. To enroll in a course or obtain a detailed course outline, r efer to ni.com/training . T echnical Support on the W eb For additional support ...
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National Instruments NI USB-9421 - page 8
NI USB-9421 U ser Guide and Specifications 8 ni.com 3. Align the I/O module with the carrier , as sho wn in Figure 4. Figure 4. Module Installation 4. Squeeze the latches and insert the NI 9421 module into the NI USB-9162 carrier . 5. Press f irmly on the connector side of the NI 9421 module un til the latches lock the module into place, as sho wn ...
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National Instruments NI USB-9421 - page 9
© National Instruments Corporation 9 NI USB-9421 User Guid e and Specifications 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. Figur e 6. Module Dimensions in Millimeters (Inches) Connecting the NI USB-9421 to a Computer Plug one end of the USB cable ...
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National Instruments NI USB-9421 - page 10
NI USB-9421 U ser Guide and Specifications 10 ni.com Wiring the NI USB-9421 Device Caution A high v oltage screw terminal backshell must be installed when using hazardous voltages (>42.4 V pk , 60 VDC). Note T able 2 illustrates the accessories a v ailable from ni. com for use with the NI USB-9421. Table 1. LED State/De vice Status LED State Dev ...
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National Instruments NI USB-9421 - page 11
© National Instruments Corporation 11 NI USB-9421 User Gu id e and Specifications 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 digi tal input channel o ...
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National Instruments NI USB-9421 - page 12
NI USB-9421 U ser Guide and Specifications 12 ni.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 termi nal or pin, DI provides a path to ground for the current or voltage. The NI USB-9421 internally limits current signals ...
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National Instruments NI USB-9421 - page 13
© National Instruments Corporation 13 NI USB-9421 User Gu id e and Specifications 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 v oltage or dri ves a cu rrent to DI that is in the input ON range. The channel registers as OFF when the de vice ...
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National Instruments NI USB-9421 - page 14
NI USB-9421 U ser Guide and Specifications 14 ni.com Figure 10. Assembled High Voltage Screw T erminal Back shell Specifications The following specifications are ty pical for the range 0 to 60 °C unless otherwise noted. All voltage s are relative to COM unless otherwise no ted. Input Characteristics Number of channels .............. .............. ...
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National Instruments NI USB-9421 - page 15
© National Instruments Corporation 15 NI USB-9421 User Gu id e and Specifications Bus Interface USB specification ..... .............. ............... USB 2.0 Hi-Speed Physical Characteristics 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 . .............. ...
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National Instruments NI USB-9421 - page 16
NI USB-9421 U ser Guide and Specifications 16 ni.com NI USB-9421 with D-SUB Safety Voltages Channel-to-COM .......... ........... .............. .30 V max Isolation Channel-to-channel.............. ........ ....No isolation betw een channels Channel-to-earth g round Withstand .... .............. .............. .1,000 V rms , verified by a 5 second ...
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National Instruments NI USB-9421 - page 17
© National Instruments Corporation 17 NI USB-9421 User Gu id e and Specifications Operating humidity (IEC 60068-2-56) ................. ......... ......... 10 to 90% RH, noncondensing Storage humidity (IEC 60068-2-56) ................. ......... ......... 5 to 95% RH, noncond ensing Maximum altitude .. .............. .............. .... 2,000 m Po ...
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National Instruments NI USB-9421 - page 18
National Instruments, NI, ni.com, and LabVIEW are tradem arks of National Instruments Corporation. Refer to t he Terms of Use section on ni.com/legal for more information abou t National Instruments trademarks. Other product and compan y names mentioned herein are trademarks or trade names of their respective companie s . For patents covering Natio ...
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