National Instruments USB-6501

USER GUIDE
NI USB-6501
24-Channel, 32-Bit Counter Digital I/O Device
The National Instruments USB-6501 is a Full Speed USB 2.0 device that provides 24 DIO
channels and a 32-bit counter. This user guide describes how to use the device.
For specifications, refer to the NI USB-6501 Device Specifications document available at
ni.com/manuals.
The following figure shows key functional components of the NI USB-6501.
Figure 1. NI USB-6501 Top and Back Views
1
2 2 4
3
NI USB-6501
24-line Digital I/O
1. USB Cable Strain Relief
2. Screw Terminal Connector Plug
3. LED Indicator
4. USB Connector
The following figure shows key functional components of the NI USB-6501.

National Instruments USB-6501 Specifications

General

Brand	National Instruments
Model	USB-6501
Category	I/O Systems
Language	English

Summary

NI USB-6501 Safety Guidelines

Installing the Software and Connecting the Device

Connecting the Device

Steps to physically connect the NI USB-6501 device after software installation.

Device Features Overview

Device Pinout and Signal Descriptions

LED Indicator Status

Explains the meaning of the green LED states indicating device connection and operation status.

Screw Terminal Connectors

Details the two detachable screw terminal connector plugs for digital signals accepting 16-28 AWG wire.

Digital IO Configuration and Operation

Static Digital IO

Digital IO Circuitry and Pull-Up Resistors

Pull-Up Resistor Value Determination

A step-by-step guide to determine the correct value for a user-provided pull-up resistor.

IO Protection Guidelines

Device Operation and Next Steps

Event Counter and Power Source

Details on the P2.7/PFI 0 event counter and the +5 V power source.