The data acquisition device does not drive the signal high or low. Each

line has a weak pull-up resistor connected to it.

You can configure P2.7 as the source for a 32-bit counter. In this

mode, the device counts high to low transitions (falling edges) on

P2.7. You can arm and disarm the counter and read or reset the count

through software.

The USB-6501 supplies a nominal 5 V from two pins, one on each

screw-terminal block. You can use the voltage source, which is provided

by the USB host, to power external components. The USB-6501 features

current limiting short circuit protection for safe USB host power use.

Software

The USB-6501 is shipped with NI-DAQmx measurement services

software, a high-performance multithreaded driver for interactive

configuration and data acquisition. Use it to develop customized data

acquisition applications with NI LabVIEW or C-based development

environments. Examples include an interactive control panel to help

you get started with your application quickly.

Recommended Accessories

The USB-6501 has built-in screw terminals for connectivity; no additional

accessories are required.

Board-Only Version for OEMs

A board-only version of the USB-6501 is available to OEMs for use in

embedded applications. The OEM version offers a 34-pin IDC ribbon

cable header for mass termination instead of screw-terminal

connectivity. You can mount the OEM version using standoffs (not

included in kit) with your own enclosure. For information on special

Low-Cost Digital I/O Device for USB

2

BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)

Figure 3. Interactive Control Panel Example Program Shipped with the USB-6501

I/O Connector

GND

Switch

TTL Signal

+5 V

+5 V

LED

LED

1

2

3

4

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

1. P0.0 configured as an open-drain digital output driving an LED

2. P0.2 configured as a push-pull digital output driving an LED

3. P0.4 configured as a digital input receiving a TTL signal from a gated inverter

4. P0.7 configured as a digital input receiving a 0 V or 5 V signal from a switch

Figure 2. Example of Connecting a Load

Ordering Information

NI USB-6501 ..........................................................................779205-01

Includes NI-DAQmx Base software and a USB cable.

NI USB-6501 hardware only (for OEM) ................................192317-50

BUY NOW!

For complete product specifications, pricing, and accessory

information, call 800 813 3693 (U.S.) or go to ni.com/daq.