National Instruments Marine RADAR NI USB 6525 User Manual

USER GUIDE AND SPECIFICATIONS

NI USB-6525

This user guide describes how to use the National Instruments USB-6525

data acquisition (DAQ) device.

Introduction

The NI USB-6525 is a full-speed USB 2.0 device that provides

eight 60 VDC channel-to-channel isolated digital inputs (DI),

eight 60 VDC/30 Vrms channel-to-channel isolated solid-state relay (SSR)

outputs, and a 32-bit counter.

USB Cable Strain Relief

Figure 1. USB-6525 Top View

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

information.

Setting Up Hardware

Complete the following steps to set up the hardware:

1. Install combicon screw terminal blocks by inserting them into the

combicon jacks.

Note The USB-6525 kit ships with signal labels. You can apply the signal labels on the

screw terminal blocks for easy signal identification.

2. Refer to Table 1 and Figure 4 for label orientation and affix provided

signal labels to the screw terminal blocks. Insert the screw terminal

blocks into their respective matching combicon jacks. Refer to

Figure 4 for more information about signal label orientation.

Overlay Label with Pin Orientation Guides

Combicon Jack

Screw Terminal Blocks

Signal Labels

Figure 4. Signal Label Application Diagram

3. Connect the wiring to the appropriate screw terminals.

USB-6525 User Guide and Specifications

I/O Connector

The USB-6525 device ships with two detachable terminal blocks for digital

signals. Each individual terminal accepts a wire gauge between

16 AWG–28 AWG.

Table 1. Digital Terminal Assignments

Module

Terminal

Signal

P0.0A

P0.0B

P0.1A

P0.1B

P0.2A

P0.2B

P0.3A

P0.3B

P0.4A

P0.4B

P0.5A

P0.5B

P0.6A

P0.6B

P0.7A

P0.7B

Module

Terminal

Signal

P1.0+

P1.0–

P1.1+

P1.1–

P1.2+

P1.2–

P1.3+

P1.3–

P1.4+

P1.4–

P1.5+

P1.5–

P1.6+

P1.6–

P1.7+/PFI 0+

P1.7–/PFI 0–

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Signal Descriptions

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

Table 2. Signal Descriptions

Signal Name

P0.<0..7>A/B

Direction

Output

Input

Description

Solid-state relay 60 VDC/30 Vrms (42.4 V_pk) output

60 VDC digital input.

P1.<0..6>+/–

P1.<0..6>+ corresponds to the positive input terminal.

P1.<0..6>– corresponds to the negative input terminal.

P1.7+/– or PFI 0+/–

Input

This channel is configurable as either a digital input or

an event counter.

Digital Input Signal— 60 VDC digital input.

P1.7+ corresponds to the positive input terminal.

P1.7– corresponds to the negative input terminal.

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

counter input source.

PFI 0+ corresponds to the positive counter terminal.

PFI 0– corresponds to the negative counter terminal.

Digital I/O

USB-6525 has eight channel-to-channel optically isolated inputs,

P1.<0..7>, and eight channel-to-channel optically isolated solid-state relay

outputs, P0.<0..7>. P1.7/PFI 0 can also function as a 32-bit counter. Refer

to the Event Counter section for more information about the counter.

Optically Isolated Inputs

The USB-6525 provides eight channels of isolated digital inputs. These

inputs consist of an optocoupler, a depletion-mode MOSFET-based

current-limiting circuit, and Schottky diode.

Each channel has its own positive and negative terminals. The input range

on the channels is –60 VDC to +60 VDC.

Sensing DC Voltages

The USB-6525 detects a wide range of DC signals, from TTL-like logic

levels to DC power supply levels up to 60 V.

USB-6525 User Guide and Specifications

Applying a DC voltage of at least 3.2 V across two input terminals registers

logic high. Applying no voltage or a voltage difference of 1 V or less

registers logic low. DC voltages between 1 V and 3.2 V may not register a

consistent or usable value.

Signal Connection Example

Figure 5 shows signal connections for a power supply and load connected

to an isolated input.

Vcc

MOSFET-Based

Current-Limiting

Circuitry

P1.x+

P1.x–

Digital

Logic

Vsupply

Load

Twisted-Pair

Wiring

Computer

Ground

Schottky

Isolation

USB-6525

Figure 5. Connecting a Power Supply and Load to the Isolated Input

Caution Use twisted-pair field wiring to reduce EMC noise.

In Figure 5, the USB-6525 is sensing a powered load that is connected to

the power supply through a switch.

Note Power supplies must be within the USB-6525 device range. Refer to the

Specifications section for information about these ranges.

When the switch is open, no current flows through the load and no voltage

is applied to the load or to the USB-6525 input. The digital logic of the

USB-6525 then registers a logic low for the channel. When the switch is

closed, current flows through both the load and the USB-6525 optocoupler,

and the USB-6525 registers a logic high for the channel.

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Solid-State Relay (SSR) Outputs

You can connect loads to the USB-6525. Connect the load to one of the

leads of the power source. Connect either the P0.xA or the P0.xB terminal

to the load and the other terminal to the other lead of the AC or DC power

source. Figure 6 shows a possible configuration where the load is

connected to the P0.xB terminal and the DC or AC power source.

Twisted-Pair

Wiring

P0.xA

Load

P0.xB

USB-6525

Figure 6. Connecting a Load to the USB-6525

Caution Use twisted-pair field wiring to reduce EMC noise.

Power-On and Power-Off Conditions

The default power-on state of the solid-state relays is open. By default, the

solid-state relays remain open when the chassis and the USB-6525 device

are powered off.

Protecting Inductive Loads

When inductive loads are connected to the USB-6525 SSR outputs, a large

counter-electromotive force may occur at switching time because of the

energy stored in the inductive load. These flyback voltages can damage the

SSR outputs and/or the external power supply.

Limit flyback voltages at your inductive load by installing one of the

following:

•

For DC loads—Install a flyback diode within 18 in. of the load.

For AC loads—Install a metal oxide varistor (MOV) rated for 30 Vrms

or slightly higher.

USB-6525 User Guide and Specifications

Figures 7 and 8 show examples of using an external flyback diode to

protect DC inductive loads and an MOV to protect AC inductive loads,

respectively.

Flyback Diode for

DC Inductive Loads

P0.xA

Inductive

Load

–

V_DC

P0.xB

USB-6525

Figure 7. Contact Protection for DC Inductive Loads

MOV for AC

Inductive Loads

P0.xA

Inductive

V_AC

Load

P0.xB

USB-6525

Figure 8. Contact Protection for AC Inductive Loads

USB-6525 User Guide and Specifications

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Using the USB-6525 as a TTL Output Device

Figure 9 shows a signal connection example for a TTL-level application

with an external supply voltage of +5 V.

To External

+5 V Supply

P0.xA

P0.xB

V_OUT

Isolated

Ground

USB-6525

Figure 9. TTL Device Signal Connection Example

When the SSR is open, a small amount of current flows through R_Land the

output voltage is close to 5 V, a logic high. When the SSR is closed, current

flows through R_Land the output voltage is close to 0 V, a logic low.

Choose an R_Lvalue small enough to provide the necessary source current

but large enough to reduce sink current and to avoid consuming

unnecessary power. Many TTL-level applications use an R_Lvalue of 5 kΩ.

Event Counter

You can configure PFI 0 (an alias to P1.7) as the source for a 32-bit counter.

In this mode, the device counts low to high transitions on P1.7. The counter

can be armed and disarmed and the count can be read or reset through

software. For more information about event timing requirements, refer to

the Specifications section. Refer to your software documentation for more

information about counter programming techniques.

Specifications

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

Isolated Inputs

Number of input channels...................... 8, ch-ch isolated

Input voltage range................................. –60 VDC to 60 VDC

USB-6525 User Guide and Specifications

Level

Min

Max

Input low voltage

Input high voltage

–60 VDC

3.2 VDC

1 VDC

60 VDC

Input current ...........................................3.0 mA/channel max

Solid-State Relay Outputs

Number of output channels.....................8, ch-ch isolated

Relay type...............................................Normally open solid-state

relay (SSR)

Switching voltage ...................................60 VDC/30 Vrms max

Switching current (per channel)..............500 mA max, full operation

temperature range

Switching rate (90% duty cycle) ............5 operations per second

Relay open time......................................60 μs typ

Relay close time......................................1.2 ms typ

On resistance...........................................550 mΩ max

Off state leakage .....................................0.6 μA typ

Counter

Number of counters ................................1 (P1.7 can be configured

as a counter)

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

Counter measurements ...........................Rising edge counting

Maximum input frequency .....................5 KHz

Minimum high pulse width.....................20 μs

Minimum low pulse width......................180 μs

Bus Interface

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

USB-6525 User Guide and Specifications

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Power Requirements

USB

Input voltage ................................... 4.5 to 5.25 VDC in

configured state

Active current ................................. 150 mA max

Suspend current............................... 350 μA typ

Physical Characteristics

Dimensions

Without connectors......................... 6.35 cm × 8.51 cm × 2.31 cm

(2.50 in. × 3.35 in. × 0.91 in.)

With connectors .............................. 8.18 cm × 8.51 cm × 2.31 cm

(3.22 in. × 3.35 in. × 0.91 in.)

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

(2) 16 position (screw terminal)

plug headers

Screw-terminal wiring............................ 16 to 28 AWG copper conductor

wire with 10 mm (0.39 in.) of

insulation stripped from the end

Torque for screw terminals .................... 0.22 – 0.25 N · m

(2.0 – 2.2 lb · in.)

Weight

With connectors .............................. Approx. 87 g (3.1 oz)

Without connectors......................... Approx. 64 g (2.3 oz)

Safety

Standards

The USB-6525 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.

USB-6525 User Guide and Specifications

Isolation

Channel-to-channel.................................60 VDC continuous

Channel-to-earth ground.........................60 VDC continuous

Withstand................................................60 VDC continuous

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

Measurement Categories II, III, or IV.

Hazardous Locations

The USB-6525 is not certified for use in hazardous locations.

Environmental

The USB-6525 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

Electromagnetic Compatibility

This product is designed to meet the requirements of the following

standards of EMC for electrical equipment for measurement, control,

and laboratory use:

•

EN 61326 EMC requirements; Minimum Immunity

EN 55011 Emissions; Group 1, Class A

CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A

Note For EMC compliance, operate this device according to product documentation.

USB-6525 User Guide and Specifications

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CE Compliance

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-6525.

Do not operate the USB-6525 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.

USB-6525 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 I¹. Measurement

circuits are subjected to working voltages²and 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 MAINS³voltage. 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 USB devices.

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

Installation Category.

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

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.

USB-6525 User Guide and Specifications

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•

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.

A Declaration of Conformity (DoC) is our claim of compliance with the

Council of the European Communities using the manufacturer’s

declaration of conformity. This system affords the user protection for

electronic compatibility (EMC) and product safety. You can obtain the DoC

for your product by visiting ni.com/certification. If your product

supports calibration, you can obtain the calibration certificate for your

product at ni.com/calibration.

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,

Canada 800 433 3488, China 86 21 6555 7838,

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Korea 82 02 3451 3400, Lebanon 961 0 1 33 28 28,

Malaysia 1800 887710, Mexico 01 800 010 0793,

Netherlands 31 0 348 433 466, New Zealand 0800 553 322,

USB-6525 User Guide and Specifications

Norway 47 0 66 90 76 60, Poland 48 22 3390150,

Portugal 351 210 311 210, Russia 7 495 783 68 51,

Singapore 1800 226 5886, Slovenia 386 3 425 42 00,

South Africa 27 0 11 805 8197, Spain 34 91 640 0085,

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Taiwan 886 02 2377 2222, Thailand 662 278 6777,

United Kingdom 44 0 1635 523545

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

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names of their respective companies. For patents covering National Instruments products, refer to the

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