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NI (National Instruments) · USB 2.0

USB-6281

The NI USB-6281 is a USB multifunction I/O device with up to 16 single-ended or 8 differential analog inputs, 2 analog outputs and 24 bidirectional digital channels. It also includes 2 counters/timers.

ManufacturerNI (National Instruments)

ModelUSB-6281

Part Number780053-02 · 780053-01

Product Type16 AI (18-Bit, 625 kS/s), 2 AO (2.86 MS/s), 24 DIO USB Multifunction I/O Device

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Bidirectional Digital Channels24

Max Single-Ended Analog Input Channels16

Number of Counters/Timers2

Max Differential Analog Input Channels8

Analog Input Absolute Accuracy980 μV

Analog Input FIFO Buffer Size2047 samples

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Overview

Product overview

Key product information and technical features.

The USB-6281 combines analog input, analog output, digital I/O and counter/timer functions in a USB-connected device. Its analog input configuration supports up to 16 single-ended channels or 8 differential channels, with a maximum sample rate of 625 kS/s.

Two analog outputs provide a maximum update rate of 2.86 MS/s, alongside 24 bidirectional digital channels and 2 counters/timers. Analog input sampling is not simultaneous; account for this when planning measurements that require channel-to-channel timing alignment.

Selectable analog input configurations with up to 16 single-ended or 8 differential channels.
Maximum analog input sample rate of 625 kS/s.
Two analog output channels with a maximum update rate of 2.86 MS/s.
24 bidirectional digital channels and 2 counters/timers.
USB 2.0 host connection.

Verified specifications

Technical data

Verified product specifications.

Number of Bidirectional Digital Channels	24
Maximum Number of Single-Ended Analog Input Channels	16
Number of Counters/Timers	2
Maximum Number of Differential Analog Input Channels	8
Analog Input Absolute Accuracy	980 μV
Analog Input FIFO Buffer Size	2047 samples
Maximum Sample Rate	625 kS/s
Simultaneous Sampling	No
Bus Connector	USB 2.0
Number of Analog Output Channels	2
Maximum Analog Update Rate	2.86 MS/s
Bus Connection	USB 2.0
NI part numbers	780053-02, 780053-01, 780053-07, 780053-06, 780053-04, 780053-03, 780054-11
NI part numbers (cont. 2)	780053-11, 780053-12, 780054-12, 780054-04, 780054-06, 780054-07, 780054-02
NI part numbers (cont. 3)	780054-03, 780053-10, 780054-09, 780053-09, 780054-01, 780054-10, 197596-03

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NI

Manufacturer

USB 2.0

Bus Connector

USB-6281

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Specifications (NI)Specifications · ni.com

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FAQ

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Product-specific answers based on available technical information.

How many analog inputs does the USB-6281 provide?

It supports up to 16 single-ended analog inputs or 8 differential analog inputs.

Does the USB-6281 support simultaneous analog input sampling?

No. The USB-6281 does not support simultaneous analog input sampling.

What are the maximum analog input and output rates?

The maximum analog input sample rate is 625 kS/s. The maximum analog output update rate is 2.86 MS/s. Consult the NI specifications for the conditions and configuration limits associated with these rates.

What digital I/O and counter resources are included?

The device includes 24 bidirectional digital channels and 2 counters/timers.

How does the USB-6281 connect to a host computer?

It uses a USB 2.0 host connection.