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USER GUIDE

USB-6501OEM

This user guide describes how to use the National Instruments USB-6501

OEM data acquisition (DAQ) device.

The NI USB-6501OEM is afull-speedUSB 2.0 device that provides 24 DIO channels and a32-bitcounter.

Dimensional Drawings

Figure 1 shows a top view of theUSB-6501OEM. Figure2 shows the front and rear dimensions.

0.45 in. (11.5 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.18 in. (4.5 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–0.03in.(–0.8mm)

 

 

 

 

 

 

0.125 in. (3.18 mm) Diameter

–0.18in.(–4.6mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.26 in. (57.4 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.13 in. (54.1 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)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.13 in. (28.7 mm)

0.89 in. (22.7 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.48 in. (12.2 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.13 in. (3.3 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.00 in. (0.0 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.65 in. (67.3 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.00 in. (0.0 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.41 in. (61.2 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.04 in. (51.8 mm)

0.33 in. (8.3 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.66 in. (42.2 mm)

Figure 1. USB-6501OEM 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-6501OEM Dimensions (Front and Rear Views)

Block Diagram

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

 

 

Short Circuit Protection

 

 

 

 

Current Limiting Circuit

 

 

Full-SpeedUSB Interface

Vbus

 

+5 V

 

 

 

P2.<0..7>

Digital I/O Terminal Block

USB

USB Microcontroller

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-6501OEM device, go toni.com/downloads, click theDrivers and Updates link, and selectMultifunction DAQ from theProduct Line drop-downlist. Next, select the appropriate software, software version, and operating system.

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I/O Connector and Cable

Use any 34-pinfemale IDC (ribbon) cable to connect to the IDC connector on theUSB-6501OEM 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

Pin 1

 

 

 

 

 

 

 

Pin 2

6

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P1.3

7

 

 

 

 

 

 

 

8

 

P2.1

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

P0.1

19

 

 

 

 

 

 

 

 

 

 

20

 

P2.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P0.2

21

Pin 33

 

 

 

 

 

 

 

Pin 34

22

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P0.3

23

 

 

 

 

 

 

 

24

 

P2.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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USB-6501OEM User Guide

Signal Descriptions

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

Table 2. Signal Descriptions

Signal Name

Direction

Description

 

 

 

 

 

 

P0.<0..7>

Input or

Digital I/O Signals—Youcan individually configure

P1.<0..7>

Output

each signal as an input or output.

P2.<0..6>

 

 

 

 

 

P2.7 (CTR 0 SRC)

Input or

This pin is configurable as either a digital line or an

 

Output

event counter.

 

 

Digital I/O Signal—Asa digital line, this signal can be

 

 

used as an input or output.

 

 

CTR—Asa counter, this signal can be used as an event

 

 

counter input source.

 

 

 

+5 V

Output

+5 V—Thevoltage source provided by the USB host.

 

 

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

 

 

system.

 

 

 

GND

Ground—Thereference for the digital signals and the

 

 

+5 VDC supply.

 

 

 

Digital I/O

The USB-6501OEM has 24single-endeddigital lines, P0.<0..7>, P1.<0..7>, and P2.<0..7>, which comprise the three DIO ports. P2.7 can also function as a32-bitcounter. Refer to theEvent Counter section for more information about the counter.

Static DIO

Each of the USB-6501OEM 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 aresoftware-timed.

Source/Sink Information

The default configuration of the USB-6501OEM DIO ports isopen-drain,allowing 5 V operation, with an onboard 4.7 kpull-upresistor. An external,user-provided,pull-upresistor can be added to increase the source current drive up to a 8.5 mA limit per line, as shown in Figure4.

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USB-6501OEM DIO Box

 

 

Short Circuit Protection

 

+5 V

Current Limiting Circuit

 

VBus

Re

 

Rp

 

 

External

 

4.7K Onboard Resistor

Pull-up

P0.0

Port Pad

Resistor

Rl

 

 

Load

 

 

A

GND

 

Figure 4. Example of Connecting ExternalUser-ProvidedResistor

Complete the following steps to determine the value of the user-providedpull-upresistor:

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-upresistor.

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

7.Reconnect the load circuit and the pull-upresistor.

Additionally, you can configure the USB-6501OEM DIO ports aspush-pull.

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 Figure4 for some common examples of connections of DIO lines with standard circuits.

© National Instruments Corporation

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USB-6501OEM User Guide

+5 V

 

 

1

 

 

LED

 

 

LED

 

P0.0

 

P0.1

 

 

2

 

P0.2

 

P0.3

3

 

P0.4

 

P0.5

+5 V

TTL Signal

P0.6

 

 

 

 

P0.7

4

 

 

Switch

 

 

 

 

GND

 

I/O Connector

 

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

2P0.2 configured as a push-pulldigital output driving a LED

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

4P0.7 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 theSpecifications 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.

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Power-OnStates

At system startup and reset, the hardware sets all DIO lines to high-impedanceinputs. The DAQ device does not drive the signal high or low. Each line has a weakpull-upresistor connected to it.

Event Counter

You can configure P2.7 as the source for a 32-bitcounter. 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-6501OEM 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 theSpecifications 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-pulloropen-drain,

 

software selectable

© National Instruments Corporation

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USB-6501OEM User Guide

Pull-upresistor........................................

4.7 kVBus (nominally 5 V)

Absolute voltage range ...........................

–0.5to 5.8 V with respect to GND

Power-onstate ........................................

Input (high impedance)

Digital logic levels

Level

Min

Max

Units

 

 

 

 

 

 

 

 

Input

 

 

 

Input low voltage

–0.3

0.8

V

Input high voltage

2.0

5.8

V

Input leakage current

50

µA

 

 

 

 

Output

 

 

 

Output low voltage (I = 8.5 mA)

0.8

V

Output high voltage

 

 

 

Push-pull,I =–8.5mA

2.0

3.5

V

Open-drain,I =–0.6mA, nominal

2.0

5.0

V

Open-drain,I =–8.5mA, with externalpull-upresistor

2.0

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)

External Voltage

+5 V output

 

Voltage ............................................

4.10 V min, 5.25 V max

Current.............................................

230 mA max

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Power Requirements

USB

 

 

4.10 to 5.25 VDC............................

80 mA typical, 500 mA max

USB Suspend ..................................

300

µA standby mode,

 

500

µA max

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

IEC 61010-1,EN61010-1

UL 61010-1

CAN/CSA-C22.2No.61010-1

Note For UL and other safety certifications, refer to the product label, or visitni.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

Channels-to-COM

±8.9 V max,

(one port, all channels)...........................

 

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

© National Instruments Corporation

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USB-6501OEM User Guide

specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energyparts of equipment, circuits powered by regulatedlow-voltagesources, 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-6501is not certified for use in hazardous locations.

Environmental

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

Operating temperature

 

(IEC 60068-2-1and IEC60068-2-2)......

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 60068-2-1and IEC60068-2-2)......

–40to 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

CE Compliance

The USB-6501OEM 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:

Low-VoltageDirective (safety)..............

73/23/EEC

Electromagnetic Compatibility

 

Directive (EMC) .....................................

89/336/EEC

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Note Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, visitni.com/certification, search by model number or product line, and click the appropriate link in the Certification column.

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-6501OEM device.

Do not operate the USB-6501OEM 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.

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.

© National Instruments Corporation

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USB-6501OEM User Guide

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 I1. Measurement circuits are subjected to working voltages2 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 MAINS3 voltage. This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment,limited-energyparts of equipment, circuits powered by regulatedlow-voltagesources, and electronics.

Measurement Category II is for measurements performed on circuits directly connected to the electrical distribution system. This category refers to local-levelelectrical 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.

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

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

2Working Voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.

3MAINS 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.

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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 developmentself-helpresources 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,

Belgium 32 0 2 757 00 20, Brazil 55 11 3262 3599,

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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 onni.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, thepatents.txt file on your CD, orni.com/patents.

© 2005 National Instruments Corporation. All rights reserved.

371594A-01

May05