National Instruments USB-6501 User Manual

USER GUIDE

USB-6501 OEM

This user guide describes how to use the National Instruments USB-6501 OEM data acquisition (DAQ) device.

The NI USB-6501 OEM is a full-speed USB 2.0 device that provides 24 DIO channels and a 32-bit counter.

Dimensional Drawings

Figure 1 shows a top view of the USB-6501 OEM. Figure 2 shows the front and rear dimensions.

0.45 in. (11.5 mm)

0.18 in. (4.5 mm) –0.03 in. (–0.8 mm) –0.18 in. (–4.6 mm)

2.26 in. (57.4 mm)

1.78 in. (45.2 mm)

1.61 in. (40.8 mm)

1.45 in. (36.7 mm)

1.37 in. (34.7 mm)

0.89 in. (22.7 mm)

0.48 in. (12.2 mm)

0.00 in. (0.0 mm)

0.33 in. (8.3 mm)

0.125 in. (3.18 mm) Diameter

2.13 in. (54.1 mm)

1.13 in. (28.7 mm)

0.13 in. (3.3 mm)

2.65 in. (67.3 mm)

2.41 in. (61.2 mm)

2.04 in. (51.8 mm)

1.66 in. (42.2 mm)

Figure 1. USB-6501 OEM Dimensions (Top View)

Block Diagram

Pin 1

0.25 in. (6.4 mm)

0.45 in. (11.5 mm)

0.34 in. (8.6 mm)

Figure 2. USB-6501 OEM Dimensions (Front and Rear Views)

Figure 3 shows key functional components of the USB-6501 OEM device.

Short Circuit Protection Current Limiting Circuit

Vbus

USB

Full-Speed USB Interface

USB Microcontroller

0.06 in. (1.6 mm)

P2.<0..7>

P1.<0..7>

P0.<0..7>

+5 V

Digital I/O Terminal Block

Figure 3. Device Block Diagram

Refer to the Safety Guidelines section of this document for important safety information.

Installing Software

To install the driver software for the USB-6501 OEM device, go to

ni.com/downloads, click the Drivers and Updates link, and select

Multifunction DAQ from the Product Line drop-down list. Next, select

the appropriate software, software version, and operating system.

USB-6501 OEM User Guide 2 ni.com

I/O Connector and Cable

Use any 34-pin female IDC (ribbon) cable to connect to the IDC connector on the USB-6501 OEM device.

Table 1 lists the pin assignments and signal names for the IDC connector.

Table 1. Pin Assignments

Signal Pin Connector Pin Signal

P1.0 1 2 GND

P1.1 3 4 P2.0

P1.2 5 6 GND

P1.3 7 8 P2.1

Pin 1

P1.4 9 10 GND

P1.5 11 12 P2.2

P1.6 13 14 GND

P1.7 15 16 P2.3

P0.0 17 18 GND

Pin 2

P0.1 19 20 P2.4

P0.2 21 22 GND

P0.3 23 24 P2.5

Pin 33

Pin 34

P0.4 25 26 GND

P0.5 27 28 P2.6

P0.6 29 30 GND

P0.7 31 32 P2.7

+5V 33 34 +5V

Signal Descriptions

Table 2 describes the signals available on the I/O connectors.

Table 2. Signal Descriptions

Signal Name Direction Description

P0.<0..7> P1.<0..7> P2.<0..6>

P2.7 (CTR 0 SRC) Input or

+5 V Output +5 V—The voltage source provided by the USB host.

GND — Ground—The reference for the digital signals and the

Input or

Output

Digital I/O Signals—You can individually configure each signal as an input or output.

This pin is configurable as either a digital line or an event counter.

Digital I/O Signal—As a digital line, this signal can be used as an input or output.

CTR—As a counter, this signal can be used as an event counter input source.

The voltage is nominally 5 V, but varies from system to system.

+5 VDC supply.

Digital I/O

The USB-6501 OEM has 24 single-ended digital lines, P0.<0..7>, P1.<0..7>, and P2.<0..7>, which comprise the three DIO ports. P2.7 can also function as a 32-bit counter. Refer to the Event Counter section for more information about the counter.

Static DIO

Each of the USB-6501 OEM DIO lines can be individually programmed as a static DI or DO line. You can use static DIO lines to monitor or control digital signals. All samples of static DI lines and updates of DO lines are software-timed.

Source/Sink Information

The default configuration of the USB-6501 OEM DIO ports is open-drain, allowing 5 V operation, with an onboard 4.7 kΩ pull-up resistor. An external, user-provided, pull-up resistor can be added to increase the source current drive up to a 8.5 mA limit per line, as shown in Figure 4.

USB-6501 OEM User Guide 4 ni.com

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