Omega USB-4750 User Manual

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User’s Guide

USB-4750

32 Channel Isolated Digital I/O

USB Data Acquisition Module

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regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

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errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

USB-4750

32-Channel Isolated
Digital I/O USB Data Acquisition

Module

User Manual

Contents

Chapter 1 Introduction ..................................................... 2

1.1 Hardware Features .. . .. .. . ......... .. .. . .......... . ......... .. .. . .......... .. . . 2

1.2 Software Overview............................................................ 3

1.2.1 More on the CD ................. ............................................ 3

Chapter 2 Installation ....................................................... 6

2.1 Unpacking ................................................................. ........ 6

2.2 Driver Installation ............................................................. 7

2.3 Hardware Installation ........................................................ 9

2.4 Hardware Uninstallation ................................................... 9

Figure 2.1:Unplug or Eject Hardware Dialog .............. 10

Figure 2.2:Stop a Hardware device dialog box ............ 10

Chapter 3 Signal Connections ........................................ 12

3.1 Overview ............................................................. ............ 12

3.2 I/O Connectors ................................................................ 12

3.2.1 Pin Assignments .......................................................... 12

Figure 3.1:I/O Connector Pin Assignment .................. 12

3.2.2 I/O Connector Signal Description ................................ 13

Table 3.1:I/O Connector Signal Descriptions .............. 13

3.2.3 LED Indicator Status Description .............................. .. 13

Table 3.2:LED Indicator Status Description ................ 13

3.3 Isolated Digital I/O Connections..................................... 14

3.3.1 Dry/Wet Contact Support for Digital Input ................. 14

Figure 3.2:Isolated Digital Input Connections ............. 14

3.3.2 Isolated Digital Output Connections .... ........................ 15

Figure 3.3:Isolated Digital Output Connections .......... 15

3.4 Field Wiring Considerations ........................................... 16

Appendix A Specifications ................................................. 18

A.1 Isolated Digital Input....................................................... 18

A.2 Isolated Digital Output .................................................... 18

A.3 Isolated Counter .............................................................. 18

A.4 General ............................................................. ............... 18

v Table of Contents

USB-4750 User Manual vi

1

2

Introduction

Sections include:

• Hardware Features

• Software Overview

Chapter 1 Introduction

Thank you for buying the USB-4750 data acquisition mod- ule. The
USB-4750 is

a powerful data acquisition (DAS) module for the USB port.

It features a unique

circuit design and complete functions for data

acquisition and control.

1.1 Hardware Features

USB-4750 features excellent measurement & control functions:

• 32 isolated digital input/output channels

• High-voltage isolation up to 2,500 VDC on all channels

• Dry/wet contact support

• Interrupt handling capability

• High-sink current for isolated output channels (100mA max./Channel)

• Digital output value retained after hot system reset

• Programmable Power-Up States for output channels

• Wiring ternimals on module

Note:

Y o u ca n inst al l up to sixteen USB-4750’ s to a

system

because of the restriction of device

BoardID

Note:

The power ou tput of an USB port is 50 0 mA,

while

the USB-4750 re quir es 350 mA (Max.).

This means that if an USB hub is used,

it will

need

an external power sup ply to support more

than one

USB-4750 de vice.

Note:

For detailed specifications of USB-4750, please
refer

to Appendix A, Specifications.

USB-4750 User Manual 2

1.2 Software Overview

Omega offers a rich set of DLL drivers, third-party driver support and
application software

on the companion CD-ROM to help fully exploit the

functions

of your device. The Device Drivers feature a complete I/O
function library to help boost your application performance and work
seamlessly with development tools such as Visual C++, Visual

Basic,

1.2.1 More on the CD

For instructions on how to begin programming in each development tool,
some tutorial chapters are included in the Device Drivers Manual

for your

reference. Please

refer to the corresponding sections in these chapters on

the Device

Drivers Manual to begin your programming efforts. You can

also look at

the example source code provided for each programming tool,

since they can

get you very well oriented.

The Device Drivers Manual can be found on the companion CD-ROM.
Alternatively, if

you have already installed the Device Drivers on your

system, The

Device Drivers Manual can be readily accessed through the

Start button:

Start/Programs/Omega USB-4700 Series/ Device Driver’s Manual

The example source code can be found under the corresponding installa­tion

folder such as the default installation path:

P rogr a m F i le s / Omega/USB-4700/Examples

3 Chapter 1

USB-4750 User Manual 4

2

2

Installation

Sections include:

• Unpacking

• Driver Installation

• Hardware Installation

• Hardware Uninstallation

Chapter 2 Installation

2.1 Unpacking

After receiving your USB-4750 package, please inspect its contents first.
The

package should contain the following i tems:

• USB-4750 Module

• Shielded USB 2.0 Cable (1.8 m)

• Companion CD-ROM (DLL driver included)

The USB-4750 Module harbors certain electronic components vulnerable
to

electro static dischar ge (ESD). ESD could easily damage the integrated

circuits and certain components

if preventive measures are not carefully

paid atten tio n to.

Before removing the module from the antistatic pl astic

bag, you should ta ke following precautions

to ward off possible ESD

damage:

• Touch the metal part of your computer chassis with your hand to dis-

charge

static electricity accumulated on your body. One can also use a

grounding strap.

• Make contact between the antistatic bag and ground before opening.

After taking out the module, you should first:

Inspect the module for any possible signs of external damage (loose or
damaged components,

etc.). If the module is visibly damaged, please

notify

our service department or our local sales representative immedi-

ately. Avoid using

a damaged module with your system.

• Avoid physical contact with materials that could hold static

electricity such

as

plastic, vinyl and Styrofoam.

USB-4750 User Manual 6

2.2 Driver Installation

We recommend you install the software driver before you install the
USB-4750 module into your system, since

this will guarantee a smooth

installation process.

The 32-bit DLL driver Setup program for the USB-4750 module is
included

on

the companion CD-ROM that is shipped with your module

package. Please

follow the steps on the following page to install the

driver software:

7 Chapter 2

For further information on driver-related issues, an online version of the
Device Drivers Manual is available by accessing the following path:

Start/Programs/Omega USB-4700 Series/ Device Driver’s

Manual

USB-4750 User Manual 8

2.3 Hardware Installation

Note:

Make sure you have installed the software dr ive r

before you install

the module (please refer to Sec-

tion 2.2 Driver Installation)

After the DLL driver installation is completed, you can now go on to
install the USB-4750 module in

any USB port that supports the
USB 1.1/2.0 standard, on your computer. It is suggested that you refer to
the computer’s user manual if you have any doubts. Please follow the
steps below

to install the module on your system.

St ep 1: Touch the metal part on the surface of your computer to neutral-

ize

the static electricity that might be in your body.

Step 2: Plug your USB module into the selected USB port. Use of exces-

sive

force must be avoided; otherwise the module might get damaged.

Note:

In case yo u i nstalled the module without installing the
DLL driver first, W indows

2000/XP will recognize your

module as an

“unknown device” after reboot, and will

prompt you to provide

necessary driver. You should

ignore the pr o mp t ing me ssa g es (just click

the Cancel

button) and set

up the driver accordin g to th e ste ps

described in Sectio n 2.2 D river Installation .

After your module is installed, you can configure it using the Device
Manager. The Device Driver's

Manual can be found at:

Start/Programs/Omega USB-4700 Series/ Device Driver’s Manual

2.4 Hardware Uninstallation

Though the USB modules are hot swappable, we still recommend you to
follow the hardware un-installation

procedure to avoid any unpredictable

damages

to your device or your system.

Step1:

Close the applications of the USB module.

9 Chapter 2

Step2:

Right click the “Unplug or Eject Hardware” icon on your task bar.

Figure 2.1: Unplug or Eject Hardware Dialog

Step3:

Select “USB-4750 Device” and press “Stop” Button.

Figure 2.2: Stop a Hardware device dialog box

Step4:

Unplug your USB device from the USB port.

Note: Please make sure that you ha ve closed the application

before

unplugging the USB device, otherwise unexpected

system error or da m age

may occur.

USB-4750 User Manual 10

3

2

Signal Connections

Sections include:

• Overview

• Isolated Digital I/O Connections

• Field Wiring Considerations

Chapter 3 Signal Connections

3.1 Overview

Maintaining good signal connections is one of the most important factors
in ensuring that your application

system is sending and receiving data

correctly. A good signal

connection can avoid unnecessary and costly

damage to your PC

and other hardware devices.

3.2 I/O Connectors

USB-4750 is equipped with plug-in screw-terminal connectors that facili­tate connection

to

the module without terminal boards or cables.

3.2.1 Pin Assignments

Figure 3.1: I/O Connector Pin Assignment

Note:

IDI0 shares the same pin wi t h IN T0

IDI4 shares the same pin with INT0_G
IDI7 shares the same pin wi t h CNT0

IDI8 shares the same pin wi t h IN T1
IDI12 share s the same pin with INT1_G

IDI15 share s

the same pin with CNT1

USB-4750 User Manual 12

3.2.2 I/O Connector Signal Description

Table 3.1: I/O Connector Signal Descriptions

Signal Reference Direction Description
IDI<0~15> GND Input Isolated digital input channels

INT<0,1> INT_G Input Interrupt trigge r sources.
INT<0,1>_

G

- - Ground for interrupt pins.

CNT<0,1> GND Input Isolated input counters
IDO<0~15> GND Output Isolated digital output channel s
COM<0,1> - - Common pins for c onnecting ind uc-

tive loads of isolated output channels

GND - - Ground

3.2.3 LED Indicator Status Description

The USB Module is equipped with a LED indicator to show the current
status

of

the device. When you plug the USB device into the USB port,

the LED

indicator will blink five times and then stay lit to indicate that it

is on.

Please refer to the following table for detailed LED indicator status

information.

Table 3.2: LED Indicator Status Description

LED Status Descriptio n
On Device ready for work

Off Device not ready to work
Slow Blinking (5 times) Device initialization
Fast Blinking

(Depends on data transfer speed).

Device working

13 Chapter 3

3.3 Isolated Digital I/O Connections

3.3.1 Dry/Wet Contact Support for Digital Input

Each digital input channel accepts either dry contact or 0 ~ 5 VDC wet
contact inputs.

Dry contact capability allows the channel to respond to

changes in external circuitry (e.g.,

the closing of a switch in the external

circuitry) when

no voltage is present in the external circuit. Figure 3-1

shows external circuitry with both

wet and dry contact components, con-

nected

as an input source to one of the card's digital input channels.

Figure 3.2: Isolated Digital Input Connections

USB-4750 User Manual 14

3.3.2 Isolated Digital Output Connections

Each of 8 isolated digital output channels comes equipped with a Darling­ton transistor. Every 8

output channels share common collectors and inte­gral suppression diodes for inductive loads. Channels 0 ~ 7 use COM0,
and channels 8 ~ 15 use

COM1 as a common pin. If an external voltage (5
~ 40 V) is applied to an isolated output channel (IDO 0 ~ IDO 15) while it
is

being used as an output channel, the current will flow from the external

voltage

source to the card. Please take care that the current through each

GND pin

not exceed 100 mA.

Figure 3.3 shows how to connect an external output load to the card's iso­lated outputs.

Figure 3.3: Isolated Digital Output Connections

15 Chapter 3

3.4 Field Wiring Considerations

• When you use USB-4750 to acquire data from outside, noises in the

environment might

significantly affect the accuracy of your measure-

ments

if due cautions are not taken. The following measures will be

helpful to

reduce possible interference running signal wires between

signal sources and

the USB-4750.

• The signal cables must be kept away from strong electromagnetic

sources such as

power lines, large electric motors, circuit breakers or

welding machines,

since they may cause strong electromagnetic inter-

ference. Keep the

analog signal cables away from any video monitor,

since it can significantly

affect a data acquisition system.

• If the cable travels through an area with significant electromagnetic

interference, you should

adopt individually shielded, twisted-pair wires

as the analog input cable.

This type of cable has its signal wires twisted

together and

shielded with a metal mesh. The metal mesh should only

be

connected to one point at the signal source ground.

• Avoid running the signal cables through any conduit that might have

power

lines in it.

• If you have to place your signal cable parallel to a power line that has a

high

voltage or high current running through it, try to keep a safe dis-

tance

between them. Or place the signal cable in a right angle to the

power line

to minimize the undesirable effect.

USB-4750 User Manual 16

A

2

Specifications

Appendix A Specifications

A.1 Isolated Digital Input

Channels

16

Interrupt Inputs

DI0, DI8

Optical Isolation

2500 VDC

Opto-isolator ResponseT ime

25 µs

Input Voltage

5~50VDC, or dry contact

A.2 Isolated Digital Output

Channels

16

Optical Isolation

2500 VDC

Opto-isolatorResponse Time

25µs

Output Voltage

5 ~ 40 VDC

Sink Current

100mA/ch. Max. 1.1A/total Max.

A.3 Isolated Counter

Channels

2 independent

Resolution

32-bit counters (low 16bit by hardware and high

16bit by firmware)

Base Clock

External 8MHz max. 2 independent program-

Internal 20MHz max.

mable clock sources

Frequency Measurement

Input frequency from 0.1Hz to 1Mhz

External Input Divide

2 to 65535

A.4 General

I/O Connector Type

10-pin screw terminal *4

Dimensions

132 X 80 X 32 mm (5.2” X 3.2” X 1.3”)

Power Consumption

5 V @ 350 mA max.

T emperature

Operation 0~60° C (32~140° F) (refer to IEC 68-2-1, 2)

Storage -20~70° C (-4~158° F)

Relative Humidity

5%~95% RH non-condensing (refer to IEC 68-2-1, 2)

USB-4750 User Manual 18

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an
additional one (1) month grace period to the normal one (1) year product warranty to cover
handling and shipping time. This ensures that OMEGA’s customers receive maximum
coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone or
written request. Upon examination by OMEGA, if the unit is found to be defective, it will be
repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting
from any action of the purchaser, including but not limited to mishandling, improper interfacing,
operation outside of design limits, improper repair, or unauthorized modification. This
WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence
of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibra­tion; improper specification; misapplication; misuse or other operating conditions outside of
OMEGA’s control. Components in which wear is not warranted, include but are not limited to
contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability
for any damages that result from the use of its products in accordance with information
provided by OMEGA, either verbal or written. OMEGA warrants only that the parts
manufactured by the company will be as specified and free of defects. OMEGA MAKES
NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES
INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of pur­chaser set forth herein are exclusive, and the total liability of OMEGA with respect to this
order, whether based on contract, warranty, negligence, indemnification, strict liability or
otherwise, shall not exceed the purchase price of the component upon which liability is
based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as
a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity;
or (2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way,
OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language,
and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability
or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY

RETURNS, please have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which

the product was PURCHASED,

2. Model and serial number of the product

under warranty, and

3. Repair instructions and/or specific

problems relative to the product.

FOR NON-WARRANTY REPAIRS,

consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:

1. Purchase Order number to cover the COST

of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2007 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without
the prior written consent of OMEGA ENGINEERING, INC.

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