Omega Products USB-4750 Installation 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 Descript ion ................................ 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
It features a unique
acquisition and control.

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

circuit design and complete functions for data

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:

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

system
BoardID

because of the restriction of device

Note:

The power output of an USB port is 500 mA,

while

the USB-4750 requir es 350 mA (Max.).

This means that if an USB hub is used,
need

an external power supply to support more

than one

USB-4750 device.

Note:

For detailed specifications of USB-4750, please
refer

to Appendix A, Specifications.

USB-4750 User Manual 2

it will

1.2 Software Overview

Omega offers a rich set of DLL drivers, third-party driver support and
application software
functions
function library to help boost your application performance and work
seamlessly with development tools such as Visual C++, Visual

of your device. The Device Drivers feature a complete I/O

on the companion CD-ROM to help fully exploit the

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
reference. Please
the Device
also look at
since they can

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

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

The example source code can be found under the corresponding installa-

folder such as the default installation path:

tion

Pr o g r a m F i l e s /Omega/USB-4700/Examples

refer to the corresponding sections in these chapters on

Drivers Manual to begin your programming efforts. You can

the example source code provided for each programming tool,

get you very well oriented.

you have already installed the Device Drivers on your

Device Drivers Manual can be readily accessed through the

3 Chapter 1

Basic,

for your

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 items:

• 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

electrostatic discharge (ESD). ESD could easily damage the integrated

circuits and certain components
paid attent ion to.

Before removing the module from the antistatic plast ic

if preventive measures are not carefully

bag, you should take followi ng precautions
damage:

• Touch the metal part of your computer chassis with your hand to dis­static electricity accumulated on your body. One can also use a

charge
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,
notify

our service department or our local sales representative immedi-

ately. Avoid using

• Avoid physical contact with materials that could hold static

electricity such

USB-4750 User Manual 6

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

a damaged module with your system.

as

plastic, vinyl and Styrofoam.

to ward off possible ESD

2.2 Driver Installation

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

The 32-bit DLL driver Setup program for the USB-4750 module is
included
package. Please
driver software:

on

the companion CD-ROM that is shipped with your module

follow the steps on the following page to install the

7 Chapter 2

this will guarantee a smooth

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

USB-4750 User Manual 8

Manual

2.3 Hardware Installation

Note: Make sure you have insta lle d th e so ftware driver

before you install
tion 2.2 Driver Installation)

the module (please refer to Sec-

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.

Step 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 you in stalled the module without installing the

DLL driver first, Windows
module as an

“unknown device” after reboot, and will
prompt you to provide
ignore the promp ting messages (just click
button) and set
described in Sectio n 2.2 D river In stallation.

up the driver according to th e ste ps

2000/XP will recognize your

necessary driver. You should

the Cancel

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
damages

Step1:

to your device or your system.

Close the applications of the USB module.

procedure to avoid any unpredictable

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 have closed the application

before

unplugging the USB device, otherwise unexpected

system error or dam a ge

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
correctly. A good signal
damage to your PC

connection can avoid unnecessary and costly

and other hardware devices.

3.2 I/O Connectors

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

3.2.1 Pin Assignments

to

the module without terminal boards or cables.

system is sending and receiving data

Note:

USB-4750 User Manual 12

Figure 3.1: I/O Connector Pin Assignment

IDI0 shares the same pin wit h IN T0

IDI4 shares the same pin with INT0_ G
IDI7 shares the same pin with CNT 0

IDI8 shares the same pin wit h IN T1
IDI12 shares the same pin with INT1_G

IDI15 shares

the same pin with CNT1

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 trigger sou rces.
INT<0,1>_

G
CNT<0,1> GND Input Isolated input counters
IDO<0~15> GND Output Isolated digital output channels
COM<0,1> - - Common pins for connecting induc-

GND - - Ground

- - Ground for interrupt pins.

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
is on.
information.

Table 3.2: LED Indicator Status Description

LED Status Description
On Device ready for work

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

(Depends on data transfer speed).

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

Please refer to the following table for detailed LED indicator status

13 Chapter 3

tive loads of isolated output channels

Device working

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.
changes in external circuitry (e.g.,
circuitry) when
shows external circuitry with both
nected

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

Dry contact capability allows the channel to respond to

the closing of a switch in the external

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

wet and dry contact components, con-

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
gral suppression diodes for inductive loads. Channels 0 ~ 7 use COM0,
and channels 8 ~ 15 use
~ 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

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

not exceed 100 mA.

output channels share common collectors and inte-

COM1 as a common pin. If an external voltage (5

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
ments

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

helpful to
signal sources and

• The signal cables must be kept away from strong electromagnetic

sources such as
welding machines,
ference. Keep the
since it can significantly

• If the cable travels through an area with significant electromagnetic

interference, you should
as the analog input cable.
together and
be

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

power

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

high
tance
power line

USB-4750 User Manual 16

reduce possible interference running signal wires between

connected to one point at the signal source ground.

lines in it.

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

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

to minimize the undesirable effect.

significantly affect the accuracy of your measure-

the USB-4750.

power lines, large electric motors, circuit breakers or

since they may cause strong electromagnetic inter-

analog signal cables away from any video monitor,

affect a data acquisition system.

adopt individually shielded, twisted-pair wires

This type of cable has its signal wires twisted

shielded with a metal mesh. The metal mesh should only

A

2

Specifications

Appendix A Specifications

A.1 Isolated Digital Input

Channels
Interrupt Inputs
Optical Isolation
Opto-isolator ResponseTime

Input Voltage

A.2 Isolated Digital Output

Channels
Optical Isolation
Opto-isolatorResponse Time
Output Voltage

Sink Current

A.3 Isolated Counter

Channels
Resolution

Base Clock

Frequency Measurement
External Input Divide

A.4 General

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

16bit by firmware)

External 8MHz max. 2 independent program-

Internal 20MHz max.

2 to 65535

I/O Connector Type
Dimensions

Power Consumption
Temperature

Relative Humidity

10-pin screw terminal *4

132 X 80 X 32 mm (5.2” X 3.2” X 1.3”)
5 V @ 350 mA max.

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

Storage -20~70° C (-4~1 58° F)

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

USB-4750 User Manual 18

16
DI0, DI8
2500 VDC

25 µs
5~50VDC, or dry contact

16
2500 VDC

25µs

5 ~ 40 VDC
100mA/ch. Max. 1.1A/total Max.

Input frequency from 0.1Hz to 1Mhz

mable clock sources

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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