Measurement USB-PDISO8 User Manual

USB-DIO24H/37

Digital Input/Output

User's Guide

Document Revision 3, January, 2011

© Copyright 2011, Measurement Computing Corporation

HM USB-DIO24H_37.doc

Your new Measurement Computing product comes with a fantastic extra —

Management committed to your satisfaction!

Thank you for choosing a Measurement Computing product—and congratulations! You own the finest, and you can now enjoy
the protection of the most comprehensive warranties and unmatched phone tech support. It’s the embodiment of our mission:

 To provide PC-based data acquisition hardware and software that will save time and save money.

Simple installations minimize the time between setting up your system and actually making measurements. We offer quick and
simple access to outstanding live FREE technical support to help integrate MCC products into a DAQ system.

Limited Lifetime Warranty: Most MCC products are covered by a limited lifetime warranty against defects in materials or
workmanship for the life of the product, to the original purchaser, unless otherwise noted. Any products found to be defective in
material or workmanship will be repaired, replaced with same or similar device, or refunded at MCC’s discretion. For specific
information, please refer to the terms and conditions of sale.

Harsh Environment Program: Any Measurement Computing product that is damaged due to misuse, or any reason, may be
eligible for replacement with the same or similar device for 50% of the current list price. I/O boards face some harsh
environments, some harsher than the boards are designed to withstand. Contact MCC to determine your product’s eligibility for
this program.

30 Day Money-Back Guarantee: Any Measurement Computing Corporation product may be returned within 30 days of
purchase for a full refund of the price paid for the product being returned. If you are not satisfied, or chose the wrong product by
mistake, you do not have to keep it.

These warranties are in lieu of all other warranties, expressed or implied, including any implied warranty of merchantability or
fitness for a particular application. The remedies provided herein are the buyer’s sole and exclusive remedies. Neither
Measurement Computing Corporation, nor its employees shall be liable for any direct or indirect, special, incidental or
consequential damage arising from the use of its products, even if Measurement Computing Corporation has been notified in
advance of the possibility of such damages.

Trademark and Copyright Information

TracerDAQ, Universal Library, Measurement Computing Corporation, and the Measurement Computing logo are either
trademarks or registered trademarks of Measurement Computing Corporation.

Windows, Microsoft, and Visual Studio are either trademarks or registered trademarks of Microsoft Corporation
LabVIEW is a trademark of National Instruments.
CompactFlash is a registered trademark of SanDisk Corporation.
XBee and XBee-PRO are trademarks of MaxStream, Inc.
All other trademarks are the property of their respective owners.
Information furnished by Measurement Computing Corporation is believed to be accurate and reliable. However, no

responsibility is assumed by Measurement Computing Corporation neither for its use; nor for any infringements of patents or
other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or
copyrights of Measurement Computing Corporation.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form by any
means, electronic, mechanical, by photocopying, recording, or otherwise without the prior written permission of Measurement
Computing Corporation.

Notice

Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use
in life support systems and/or devices without prior written consent from Measurement Computing Corporation.
Life support devices/systems are devices or systems which, a) are intended for surgical implantation into the body,
or b) support or sustain life and whose failure to perform can be reasonably expected to result in injury.
Measurement Computing Corporation products are not designed with the components required, and are not subject
to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people.

3

Table of Contents

Preface

About this User's Guide ....................................................................................................................... 5

What you will learn from this user's guide ......................................................................................................... 5

Conventions in this user's guide ......................................................................................................................... 5

Where to find more information ......................................................................................................................... 5

Chapter 1

Introducing the USB-DIO24H/37 .......................................................................................................... 6

Overview: USB-DIO24H/37 features ................................................................................................................. 6

USB-DIO24H/37 block diagram ........................................................................................................................ 6

Software features ................................................................................................................................................ 7

Connecting a USB-DIO24H/37 to your computer is easy .................................................................................. 7

Chapter 2

Installing the USB-DIO24H/37 .............................................................................................................. 8

What comes with your USB-DIO24H/37 shipment? .......................................................................................... 8

Hardware .......................................................................................................................................................................... 8

Additional documentation ................................................................................................................................................. 8

Optional components ........................................................................................................................................................ 8

Unpacking the USB-DIO24H/37 ........................................................................................................................ 9

Installing the software ........................................................................................................................................ 9

Installing the USB-DIO24H/37 .......................................................................................................................... 9

Connecting the USB-DIO24H/37 to your system ............................................................................................................. 9

Connecting the board for I/O operations .......................................................................................................... 10

Connectors and cables......................................................................................................................................................10

Connector pinout..............................................................................................................................................................10

Cables ..............................................................................................................................................................................11

Field wiring, signal termination and conditioning ...........................................................................................................11

Chapter 3

Functional Details ............................................................................................................................... 12

Components ...................................................................................................................................................... 12

37-pin I/O connector ........................................................................................................................................................12

USB connector .................................................................................................................................................................13

LED .................................................................................................................................................................................13

Pull-up resistors ...............................................................................................................................................................13

Power consumption .......................................................................................................................................... 13

Output (source) current limits ..........................................................................................................................................14

Output (sink) current limits ..............................................................................................................................................14

Mechanical Drawings ....................................................................................................................................... 14

Chapter 4

Specifications ...................................................................................................................................... 15

Digital input/output........................................................................................................................................... 15

Counter ............................................................................................................................................................. 16

Data transfer rates ............................................................................................................................................. 16

Power ................................................................................................................................................................ 16

General ............................................................................................................................................................. 17

Environmental .................................................................................................................................................. 17

Mechanical ....................................................................................................................................................... 17

Main connector and pinout ............................................................................................................................... 17

Declaration of Conformity .................................................................................................................. 19

4

About this User's Guide

What you will learn from this user's guide

This user's guide explains how to install, configure and use the USB-DIO24H/37 digital I/O board. This user's
guide also refers you to related documents available on our web site and to technical support resources.

Conventions in this user's guide

For more information on …

Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.

Caution! Shaded caution statements present information to help you avoid injuring yourself and others,

damaging your hardware, or losing your data.

bold text Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes.

Preface

italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.

Where to find more information

For additional information relevant to the operation of your hardware, refer to the Documents subdirectory
where you installed the MCC DAQ software (C:\Program Files\Measurement Computing\DAQ by default), or
search for your device on our website at www.mccdaq.com.

5

Chapter 1

Introducing the USB-DIO24H/37

Overview: USB-DIO24H/37 features

This manual explains how to install, configure and use the USB-DIO24H/37 digital I/O board. You can use this
board in a variety of digital applications to control logic devices such as switches, gauges, relays, pumps, and
sensors.

The USB-DIO24H/37 is a USB 2.0 low-speed device supported under popular Microsoft® Windows® operating
systems. It is designed for USB 1.1 ports, and was tested for full compatibility with both USB 1.1 and USB 2.0
ports.

The USB-DIO24H/37 is a high drive, 24-line digital I/O device that includes one 32-bit external event counter.
Power is supplied by the +5 volt USB supply from your computer. No external power is required.

Digital I/O lines are accessed through a 37-pin connector. Each digital port can be configured for either input or
output. Digital channels are pulled up to +5V with 47k resistors.

The control register that sets the direction of the I/O ports is an emulation of the 82C55 in mode 0 (only). The
74FCT244 outputs are high-drive TTL, capable of sourcing 15 mA and sinking 64 mA.

The USB-DIO24H/37 board is completely plug-and-play, with no jumpers or switches to set. All board
addresses are set by your system's plug-and-play software.

USB-DIO24H/37 block diagram

USB-DIO24H/37 functions are illustrated in the block diagram shown here.

Figure 1. USB-DIO24H/37 functional block diagram

6