NI USB-6501 OEM User Guide

USER GUIDE AND SPECIFICATIONS

NI 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)

0.00 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)

Pin 1

0.45 in. (11.5 mm)

0.25 in. (6.4 mm)

0.34 in. (8.6 mm)

0.06 in. (1.6 mm)

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

Block Diagram

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

Short Circuit Protection

Current Limiting Circuit

Vbus +5 V

USB USB Microcontroller

P2.<0..7>

P1.<0..7>

P0.<0..7>

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.

NI USB-6501 OEM User Guide and Specifications 2 ni.com

P0.2

P0.3

P0.4

P0.5

P1.6

P1.7

P0.0

P0.1

Signal

P1.0

P1.1

P1.2

P1.3

P1.4

P1.5

P0.6

P0.7

+5V

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.

25

27

29

31

33

17

19

21

23

9

11

13

15

5

7

1

3

Pin

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

Table 1. Pin Assignments

Pin 1

Pin 33

Connector

Pin 2

Pin 34

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

Pin

GND

P2.3

GND

P2.4

GND

P2.5

GND

P2.6

Signal

GND

P2.0

GND

P2.1

GND

P2.2

GND

P2.7

+5V

© National Instruments Corporation

3 NI USB-6501 OEM User Guide and Specifications

Signal Descriptions

Signal Name

P0.<0..7>

P1.<0..7>

P2.<0..6>

P2.7/PFI 0

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

Table 2. Signal Descriptions

Direction

Input or

Output

Description

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

+5 V

GND

Input or

Output

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.

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

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

Ground—The reference for the digital signals and the

+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 k

Ω 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.

NI USB-6501 OEM User Guide and Specifications 4 ni.com

Re

External

Pull-up

Resistor

Rl

Load

+5 V

USB-6501 OEM DIO Device

Short Circuit Protection

Current Limiting Circuit

VBus

Rp

4.7K Onboard Resistor

P0.0

Port Pad

A GND

Figure 4. Example of Connecting External User-Provided Resistor

Complete the following steps to determine the value of the user-provided pull-up resistor:

1.

Place an ammeter in series with the load.

2.

Place a variable resistor between the digital output line and the +5 V.

3.

Adjust the variable resistor until the ammeter current reads as the intended current. The intended current must be less than 8.5 mA.

4.

Remove the ammeter and variable resistor from your circuit.

5.

Measure the resistance of the variable resistor. The measured resistance is the ideal value of the pull-up resistor.

6.

Select a static resistor value for your pull-up resistor that is greater than or equal to the ideal resistance.

7.

Reconnect the load circuit and the pull-up resistor.

Additionally, you can configure the USB-6501 OEM DIO ports as push-pull. When configured as active drive, the total current sourced by all

DO lines simultaneously should not exceed 65 mA.

Digital I/O Circuitry

Figure 5 shows P0.<0..7> connected to example signals configured as

digital inputs and digital outputs. You can configure P1.<0..7> and

P2.<0..7> similarly. Refer to Figure 4 for some common examples of

connections of DIO lines with standard circuits.

© National Instruments Corporation

5 NI USB-6501 OEM User Guide and Specifications

1

LED

+5 V

2

3

LED

+5 V TTL Signal

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

4

Switch

GND

I/O Connector

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

2 P0.2 configured as a push-pull digital output driving a 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 5. Example of Connecting a Load

Caution

Exceeding the maximum input voltage ratings or maximum output ratings, which

are listed in the

Specifications

section, can damage the DAQ device and the computer.

National Instruments is not liable for any damage resulting from such signal connections.

I/O Protection

Each DIO signal is protected against overvoltage, undervoltage, and overcurrent conditions, as well as ESD events. However, you should avoid these fault conditions by using the following guidelines:

• If you configure a DIO line as an output, do not connect it to any external signal source, ground signal, or power supply.

• If you configure a DIO line as an output, understand the current requirements of the load connected to these signals. Do not exceed the specified current output limits of the DAQ device.

• If you configure a DIO line as an input, do not drive the line with voltages outside of its normal operating range.

• Treat the DAQ device as you would treat any static sensitive device.

Always properly ground yourself and the equipment when handling the DAQ device or connecting to it.

NI USB-6501 OEM User Guide and Specifications 6 ni.com

Power-On States

At system startup and reset, the hardware sets all DIO lines to high-impedance inputs. The DAQ device does not drive the signal high or low. Each line has a weak pull-up resistor connected to it.

Event Counter

You can configure P2.7 as the source for a 32-bit counter. In this mode, the device counts high to low transitions on P2.7. The counter can be armed and disarmed and the count can be read or reset through software. Refer to your software documentation for more information about counter programming techniques.

+5 V Power Source

Caution

When using the 5 V source, understand the current requirements of the load connected. Do not exceed the specified current output limits of the USB Vbus.

The USB-6501 OEM supplies a nominal 5 V from two pins on the front

IDC connector. The voltage source is provided by the USB host. The voltage is nominally 5 V, but varies from system to system. Refer to the

Specifications section for more information about USB bus power

specifications. This source can be used to power external components.

Note

While the device is in USB suspend, the output is disabled.

Specifications

The following specifications are typical at 25 °C, unless otherwise noted.

Digital I/O

Number of lines

P0.<0..7>......................................... 8

P1.<0..7>......................................... 8

P2.<0..7>......................................... 8

Direction control .................................... Input or output, software-selectable

Output driver type .................................. Push-pull or open-drain, software selectable

© National Instruments Corporation

7 NI USB-6501 OEM User Guide and Specifications

Pull-up resistor........................................4.7 k

Ω VBus (nominally 5 V)

Absolute voltage range ...........................–0.5 to 5.8 V with respect to GND

Power-on state ........................................Input (high impedance)

Digital logic levels

Level

Input

Input low voltage

Input high voltage

Input leakage current

Output

Output low voltage

Open collector (open-drain) or active drive (push pull)

I

OL

= 2 mA

I

OL

= 8.5 mA

Min

–0.3

2.0

—

—

—

Max

0.8

5.8

50.0

0.4

0.8

Units

V

V

μA

V

V

Output high voltage

Active drive (push-pull

1

)

I

OH

I

OH

= –2 mA

= –8.5 mA

Open collector (open-drain), I

OH

= –0.4 mA, nominal

Open collector (open-drain), I

OH

= –7.5 mA, with external pull-up resistor

2.8

2.0

2.0

2.0

1

The total current sourced by all DO lines simultaneously should not exceed 65 mA.

3.6

3.5

5.0

—

V

V

V

V

Counter

Number of counters ................................1 (P2.7 can be configured as a counter)

Resolution ...............................................32 bits

Counter measurements ...........................Falling edge counting

Maximum input frequency .....................5 MHz

Minimum high pulse width.....................100 ns

Minimum low pulse width......................100 ns

Bus Interface

USB specification ...................................USB 2.0 full-speed (12 Mb/s)

NI USB-6501 OEM User Guide and Specifications 8 ni.com

External Voltage

+5 V output

Voltage............................................ 4.00 V min, 5.25 V max

Current ............................................ 230 mA max

Power Requirements

USB

Input voltage ................................... 4.50 to 5.25 VDC, in configured state

Active current ................................. 80 mA typical, 500 mA max

Suspend current............................... 500

μA max, all DIO lines disconnected

Physical Characteristics

Dimensions ............................................ 5.74 cm

× 6.73 cm × 1.15 cm

(2.26 in.

× 2.65 in. × 0.45 in.)

I/O connectors ........................................ USB series B receptacle;

34-pin IDC ribbon cable header

Weight .................................................... 21 g (.74 oz)

Safety

Standards

The USB-6501 is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use:

• IEC 61010-1, EN 61010-1

• UL 61010-1, CSA 61010-1

Note

For UL and other safety certifications, refer to the product label, or visit ni.com/certification

, search by model number or product line, and click the appropriate link in the Certification column.

Overvoltage Protection

Connect only voltages that are within these limits.

Channel-to-COM (one channel)

............. ±30 V max,

Measurement Category I

© National Instruments Corporation

9 NI USB-6501 OEM User Guide and Specifications

Channels-to-COM

(one port, all channels)

...........................±8.9 V max,

Measurement Category I

Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as

MAINS voltage. MAINS is a hazardous live electrical supply system that powers equipment. This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics.

Caution

Do not use this module for connection to signals or for measurements within

Measurement Categories II, III, or IV.

Hazardous Locations

The USB-6501 is not certified for use in hazardous locations.

Environmental

The USB-6501 device is intended for indoor use only.

Operating temperature

(IEC 60068-2-1 and IEC 60068-2-2)......0 to 55 °C

Operating humidity

(IEC 60068-2-56) ...................................10 to 90% RH, noncondensing

Maximum altitude...................................2,000 m (at 25 °C ambient temperature)

Storage temperature

(IEC 60068-2-1 and IEC 60068-2-2)......–40 to 85 °C

Storage humidity

(IEC 60068-2-56) ..................................5 to 90% RH, noncondensing

Pollution Degree (IEC 60664) ................2

EMC/EMI ...............................................CE, C-Tick, and FCC Part 15

(Class A) Compliant

NI USB-6501 OEM User Guide and Specifications 10 ni.com

CE Compliance

The USB-6501 OEM device is intended to be used as part of a system. To ensure that your system meets the appropriate CE Compliance regulations, you must test the entire system.

This product meets the essential requirements of applicable European

Directives, as amended for CE marking, as follows:

• 73/23/EEC; Low-Voltage Directive (safety)

• 89/336/EEC; Electromagnetic Compatibility Directive (EMC)

Note

Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, visit ni.com/certification

, search by model number or product line, and click the appropriate link in the Certification column.

Waste Electrical and Electronic Equipment (WEEE)

EU Customers

At the end of their life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers and National Instruments

WEEE initiatives, visit ni.com/environment/weee.htm

.

Safety Guidelines

Caution

Operate the hardware only as described in these operating instructions.

The following section contains important safety information that you must follow when installing and using the USB-6501 OEM device.

Do not operate the USB-6501 OEM device in a manner not specified in this document. Misuse of the device can result in a hazard. You can compromise the safety protection built into the device if the device is damaged in any way. If the device is damaged, contact National Instruments for repair.

Do not substitute parts or modify the device except as described in this document. Use the device only with the chassis, modules, accessories, and cables specified in the installation instructions. You must have all covers and filler panels installed during operation of the device.

Do not operate the device in an explosive atmosphere or where there may be flammable gases or fumes. If you must operate the device in such an environment, it must be in a suitably rated enclosure.

If you need to clean the device, use a dry cloth. Make sure that the device is completely dry and free from contaminants before returning it to service.

© National Instruments Corporation

11 NI USB-6501 OEM User Guide and Specifications

Operate the device only at or below Pollution Degree 2. Pollution is foreign matter in a solid, liquid, or gaseous state that can reduce dielectric strength or surface resistivity. The following is a description of pollution degrees:

• Pollution Degree 1 means no pollution or only dry, nonconductive pollution occurs. The pollution has no influence.

• Pollution Degree 2 means that only nonconductive pollution occurs in most cases. Occasionally, however, a temporary conductivity caused by condensation must be expected.

• Pollution Degree 3 means that conductive pollution occurs, or dry, nonconductive pollution occurs that becomes conductive due to condensation.

You must insulate signal connections for the maximum voltage for which the device is rated. Do not exceed the maximum ratings for the device. Do not install wiring while the device is live with electrical signals. Do not remove or add connector blocks when power is connected to the system.

Avoid contact between your body and the connector block signal when hot swapping modules. Remove power from signal lines before connecting them to or disconnecting them from the device.

Operate the device at or below the Measurement Category I

1

. Measurement circuits are subjected to working voltages

2

and transient stresses

(overvoltage) from the circuit to which they are connected during measurement or test. Measurement categories establish standard impulse withstand voltage levels that commonly occur in electrical distribution systems. The following is a description of measurement categories:

• Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS

3

voltage. This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics.

• Measurement Category II is for measurements performed on circuits directly connected to the electrical distribution system. This category refers to local-level electrical distribution, such as that provided by a standard wall outlet (for example, 115 V for U.S. or 230 V for Europe).

Examples of Measurement Category II are measurements performed on household appliances, portable tools, and similar E Series devices.

1

Measurement Category as defined in electrical safety standard IEC 61010-1. Measurement Category is also referred to as

Installation Category.

2

Working Voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.

3

MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may be connected to the MAINS for measuring purposes.

NI USB-6501 OEM User Guide and Specifications 12 ni.com

• Measurement Category III is for measurements performed in the building installation at the distribution level. This category refers to measurements on hard-wired equipment such as equipment in fixed installations, distribution boards, and circuit breakers. Other examples are wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and stationary motors with permanent connections to fixed installations.

Measurement Category IV is for measurements performed at the primary electrical supply installation (<1,000 V). Examples include electricity meters and measurements on primary overcurrent protection devices and on ripple control units.

Where to Go for Support

The National Instruments Web site is your complete resource for technical support. At ni.com/support

you have access to everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.

National Instruments corporate headquarters is located at

11500 North Mopac Expressway, Austin, Texas, 78759-3504.

National Instruments also has offices located around the world to help address your support needs. For telephone support in the United States, create your service request at ni.com/support

and follow the calling instructions or dial 512 795 8248. For telephone support outside the United

States, contact your local branch office:

Australia 1800 300 800, Austria 43 0 662 45 79 90 0,

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Taiwan 886 02 2377 2222, Thailand 662 278 6777,

United Kingdom 44 0 1635 523545

National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation.

Refer to the Terms of Use section on ni.com/legal for more information about National

Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents

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371594B-01 Oct06