© National Instruments Corporation v NI USB-621x User ManualContentsAbout This ManualConventions ...................................................................................................................xiiiRelated Documentation..................................................................................................xivChapter 1Getting StartedInstalling NI-DAQmx ....................................................................................................1-1Installing Other Software...............................................................................................1-1Installing the Hardware..................................................................................................1-1Device Pinouts ...............................................................................................................1-1Device Specifications ....................................................................................................1-2Applying Signal Labels to the USB-621x......................................................................1-2USB Cable Strain Relief ................................................................................................1-3Mounting the USB-621x ................................................................................................1-4Desktop Use.....................................................................................................1-4DIN Rail Mounting..........................................................................................1-4Panel Mounting ...............................................................................................1-5Chapter 2DAQ System OverviewDAQ Hardware ..............................................................................................................2-1DAQ-STC2......................................................................................................2-2Calibration Circuitry........................................................................................2-2Signal Conditioning .......................................................................................................2-3Sensors and Transducers .................................................................................2-3Cables and Accessories..................................................................................................2-4USB-621x Mass Termination Custom Cabling...............................................2-4Programming Devices in Software ................................................................................2-5Chapter 3Connector and LED InformationI/O Connector Signal Descriptions ................................................................................3-1+5 V Power ....................................................................................................................3-3+5 V Power as an Output ................................................................................3-3+5 V Power as an Input ...................................................................................3-3USB Device Fuse Replacement .....................................................................................3-3PWR/ACT LED Indicator .............................................................................................3-5
