© National Instruments Corporation 1-1 NI USB-621x User Manual
1
Getting Started
NI USB-621x devices feature up to 32 analog input (AI) channels, up to 
two analog output (AO) channels, two counters, and up to eight lines 
of digital input (DI) and up to eight lines of digital output (DO), or 
32 bidirectional static DIO lines.
Installing NI-DAQmx
The NI-DAQmx for USB Devices Getting Started Guide, which you can 
download from 
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.
Installing the Hardware
The NI-DAQmx for USB Devices Getting Started Guide contains 
non-software-specific information about how to install USB devices. 
Before installing your DAQ device, you must install the software you plan 
to use with the device.