USB-1024LS
24-bit Digital I/O
Low-speed USB 2.0 device

User’s GuideUSB-1024LS
USB-based Digital I/O Module
User's Guide

Document Revision 2A, May, 2006
© Copyright 2006, Measurement Computing Corporation

Trademark and Copyright Information
Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo areeither trademarks or registered trademarks of Measurement Computing Corporation. Refer to the Copyrights &Trademarks section on mccdaq.com/legal for more information about Measurement Computing trademarks.
Other product and company names mentioned herein are trademarks or trade names of their respective
companies.
© 2006 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.
NoticeMeasurement 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 that, 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 ininjury. 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 ofpeople.

iii

Table of Contents
Preface

About this User's Guide .......................................................................................................................v
What you will learn from this user's guide .........................................................................................................v
Conventions in this user's guide .........................................................................................................................v
Where to find more information .........................................................................................................................v
Chapter 1

Introducing the USB-1024LS............................................................................................................ 1-1
USB-1024LS block diagram........................................................................................................................... 1-2
Software features ............................................................................................................................................ 1-2
Connecting a USB-1024LS to your computer is easy .................................................................................... 1-3
Chapter 2

Installing the USB-1024LS................................................................................................................ 2-1
What comes with your USB-1024LS shipment? ............................................................................................ 2-1
Hardware ....................................................................................................................................................................... 2-1
Additional documentation.............................................................................................................................................. 2-1

Unpacking the USB-1024LS .......................................................................................................................... 2-1
Installing the software .................................................................................................................................... 2-2
Installing the hardware ................................................................................................................................... 2-2
Chapter 3

Functional Details ............................................................................................................................. 3-1
External components ...................................................................................................................................... 3-1
USB connector............................................................................................................................................................... 3-1
LED ............................................................................................................................................................................... 3-1
Screw terminal wiring.................................................................................................................................................... 3-1
Main connector and pin out ........................................................................................................................................... 3-2
Digital I/O terminals (Port A0 to A7, Port B0 to B7, Port C0 to C7)............................................................................. 3-3
Power terminals ............................................................................................................................................................. 3-4
Ground terminals ........................................................................................................................................................... 3-4
Counter terminal ............................................................................................................................................................ 3-4
Chapter 4

Specifications.................................................................................................................................... 4-1
Digital input / output....................................................................................................................................... 4-1
Counter ........................................................................................................................................................... 4-1
Power.............................................................................................................................................................. 4-1
General ........................................................................................................................................................... 4-2
Environmental ................................................................................................................................................ 4-2
Mechanical ..................................................................................................................................................... 4-2
Main connector and pin out ............................................................................................................................ 4-3

iv

Preface

About this User's Guide
What you will learn from this user's guideThis user's guide explains how to install, configure, and use the USB-1024LS so that you get the most out of its
USB digital I/O features.
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 arereading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
<#:#>

Angle brackets that enclose numbers separated by a colon signify a range of numbers, such as those assigned
to registers, bit settings, etc.

bold text

Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes. For
example:1. Insert the disk or CD and click the OK button.

italic text

Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase. For
example:The InstaCal® installation procedure is explained in the Quick Start Guide.
Never touch the exposed pins or circuit connections on the board.

Where to find more information
Additional information about E-1608 hardware is available on our website at www.mccdaq.com. You can also
contact Measurement Computing Corporation by phone, fax, or email with specific questions.


Knowledgebase: kb.mccdaq.com
Tech support form: www.mccdaq.com/support/support_form.aspx
Email: techsupport@mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Supportv

Chapter 1

Introducing the USB-1024LS
This user's guide contains all of the information you need to connect the USB-1024LS measurement andautomation device to your computer and to other data acquisition hardware.
The USB-DIO24/37 is a USB 1.1 low-speed module 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-1024LS features 24 bits of digital I/O and one 32-bit external event counter. The device is poweredby the +5 volt USB supply. No external power is required.
An on-board industry standard 82C55 programmable peripheral interface chip provides the 24 discrete digital
I/O lines in four ports. You can configure each digital port independently for either input or output.
The USB-1024LS USB device is shown in Figure 1-1. All I/O connections are made to the screw terminals
located along each side of the USB-1024LS.

Figure 1-1. USB-1024LS

1-1

USB-1024LS User's Guide

Introducing the USB-1024LS

USB-1024LS block diagram
USB-1024LS functions are illustrated in the block diagram shown here.

USB 1.1
CompliantInterfaceUSB
Microcontroller

82C55 DIOPort Port Port PortA
B C HI C LO
88

432-bitEvent Counter1 channel

4
1

Screw terminal I/O connector
Figure 1-2. USB-1024LS functional block diagram

Software features
For information on the features of InstaCal and the other software included with your USB-1024LS, refer to the
Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.
Check www.mccdaq.com/download.htm for the latest software version or versions of the software supported
under less commonly used operating systems.

1-2

USB-1024LS User's Guide

Introducing the USB-1024LS

Connecting a USB-1024LS to your computer is easy
Installing a data acquisition device has never been easier.
!

!
!

!
!
!

The USB-1024LS relies upon the Microsoft Human Interface Device (HID) class drivers. The HID classdrivers ship with every copy of Windows that is designed to work with USB ports. We use the Microsoft
HID because it is a standard, and its performance delivers full control and maximizes data transfer rates foryour USB-1024LS. No third-party device driver is required.
The USB-1024LS is plug-and-play. There are no jumpers to position, DIP switches to set, or interrupts toconfigure.
You can connect the USB-1024LS before or after you install the software, and without powering down
your computer first. When you connect an HID to your system, your computer automatically detects it andconfigures the necessary software. You can connect and power multiple HID peripherals to your systemusing a USB hub.
You can connect your system to various devices using a standard four-wire cable. The USB connector
replaces the serial and parallel port connectors with one standardized plug and port combination.
You do not need a separate power supply module. The USB automatically delivers the electrical power
required by each peripheral connected to your system.
Data can flow two ways between a computer and peripheral over USB connections.

1-3

Chapter 2

Installing the USB-1024LS
What comes with your USB-1024LS shipment?
The following items are shipped with the USB-1024LS:

Hardware!

USB-1024LS!

USB cable (2 meter length)

Additional documentation
In addition to this hardware user's guide, you should also receive the Quick Start Guide (available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf). This booklet supplies a brief description of
the software you received with your USB-1024LS and information regarding installation of that software.
Please read this booklet completely before installing any software or hardware.

Unpacking the USB-1024LS
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the USB-1024LS from its packaging, ground yourself using a wrist strap or bysimply touching the computer chassis or other grounded object to eliminate any stored static charge.
If your USB-1024LS is damaged, notify Measurement Computing Corporation immediately by phone, fax, or email. For international customers, contact your local distributor where you purchased the USB-1024LS.
!
!
!

Phone: 508-946-5100 and follow the instructions for reaching Tech Support.
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
2-1

USB-1024LS User's Guide

Installing the USB-1024LS

Installing the software
Refer to the Quick Start Guide for instructions on installing the software on the Measurement Computing Data
Acquisition Software CD. This booklet is available in PDF at www.mccdaq.com/PDFmanuals/DAQ-SoftwareQuick-Start.pdf.

Installing the hardware
Be sure you are using the latest system software
Before you connect the USB-1024LS, make sure that you are using the latest versions of the USB drivers.
Before installing the USB-1024LS, download and install the latest Microsoft Windows updates. In particular,when using Windows XP, make sure you have XP Hotfix KB822603 installed. This update is intended toaddress a serious error in Usbport.sys when you operate a USB device. You can run Windows Update or
download the update from www.microsoft.com/downloads/details.aspx?familyid=733dd867-56a0-4956-b7fee85b688b7f86&displaylang=en. For more information, refer to the Microsoft Knowledge Base article"Availability of the Windows XP SP1 USB 1.1 and 2.0 update." This article is available at
support.microsoft.com/?kbid=822603.
To connect the USB-1024LS to your system, turn your computer on, and connect the USB cable to a USB port
on your computer or to an external USB hub that is connected to your computer. The USB cable provides powerand communication to the USB-1024LS.
When you connect the USB-1024LS for the first time, a Found New Hardware popup balloon (Windows XP)
or dialog (other Windows version) displays as the USB-1024LS is detected by your computer.

Another Found New Hardware balloon or dialog opens after the first closes that identifies the USB-1024LS asa USB Human Interface Device. This balloon or dialog indicates that your USB-1024LS is installed and readyto use.
When the balloon or dialog closes, the LED on the USB-1024LS should flash and then remain lit. This indicatesthat communication is established between the USB-1024LS and your computer.
Caution! Do not disconnect any device from the USB bus while the computer is communicating with theUSB-1024LS, or you may lose data and/or your ability to communicate with the USB-1024LS.
If the LED turns off
If the LED is illuminated but then turns off, the computer has lost communication with the USB-1024LS. To
restore communication, disconnect the USB cable from the computer, and then reconnect it. This action should
restore communication, at which time the LED will turn on.

2-2

Chapter 3

Functional Details
External components
The USB-1024LS has the following external components, as shown in Figure 3-1.
!
!
!

USB connector
LED
Screw terminal banks (2)LED

Screw terminal
Pins 1 to 20

Screw terminal
Pins 21 to 40
USBconnector / cable
Figure 3-1. USB-1024LS external components

USB connector
The USB connector is on the right side of the USB-1024LS housing. This connector provides +5 V power andcommunication. The voltage supplied through the USB connector is system-dependent, and may be less than +5
V. No external power supply is required.

LED
The LED on the front of the housing indicates the communication status of the USB-1024LS. It uses up to 5
mA of current and cannot be disabled. Table 3-1 defines the function of the USB-1024LS LED.
Table 3-1. LED Illumination
LED Illumination

Indication

Steady green
Blinks continuously
Blinks three times

The USB-1024LS is connected to a computer or external USB hub.
Data is being transferred.
Initial communication is established between the USB-1024LS and the computer.

Screw terminal wiring
The USB-1024LS has two rows of screw terminals – one row on the top edge of the housing, and one row on
the bottom edge. Each screw terminal bank provides 20 connections. Pin numbers are identified in Figure 3-2.

3-1

USB-1024LS User's Guide

Functional Details

Pin 20

Pin 1

Pin 40Pin 21Figure 3-2. USB-1024LS screw terminal pin numbers

Screw terminal – pins 1-20
The screw terminals on the top edge of the USB-1024LS (pins 1 to 20) provide the following connections:!
!
!

Eight digital I/O connections (Port C0 to Port C7)
One counter connection (CTR)
Five ground connections (GND)

Screw terminal – pins 21-40
The screw terminals on the bottom edge of the USB-1024LS (pins 21 to 40) provide the following connections:!
!
!

16 digital I/O connections (Port A0 to Port A7, and Port B0 to Port B7)
One power connection (PC+5 V)
Three ground connections (GND)

Main connector and pin out
Connector type
Wire gauge range

Screw Terminal
16 AWG to 30 AWG

3-2

Functional Details

GND
Port B7
Port B6
Port B5
Port B4
Port B3
Port B2
Port B1
Port B0
GND
PC+5V
GND
Port A7
Port A6
Port A5Port A4
Port A3
Port A2
Port A1
Port A0

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21

20 CTR
19 GND
18 n/c17 GND
16 n/c15 GND
14 n/c13 n/c12 GND
11 n/c10 n/c
9 GND
8 Port C7
7 Port C6
6 Port C5
5 Port C4
4 Port C3
3 Port C2
2 Port C1
1 Port C0

USB-1024LS User's Guide

Digital I/O terminals (Port A0 to A7, Port B0 to B7, Port C0 to C7)Connect up to 24 digital I/O lines to the screw terminal containing pins 1 to 8 (Port C0 to Port C7), pins 21 to
28 (Port A0 to Port A7), and pins 32 to 39, (Port B0 to Port B7). Refer to the pinout diagram on page 2 for thelocation of these pins. You can configure each digital port for either input or output.
When configured for input, you can use the USB-1024LS digital I/O terminals to detect the state of any TTL
level input. Refer to the switch shown in Figure 3-3 and the schematic shown in Figure 3-4. If the switch is set
to the +5 V input, Port A0 reads TRUE (1). If you move the switch to GND, Port A0 reads FALSE.

Figure 3-3. Digital connection of Port A0 detecting the state of a switch
Port A0+GND+5V

Figure 3-4. Schematic showing switch detection by digital channel Port A0

For more information on digital signal connections
For more information on digital signal connections and digital I/O techniques, refer to the Guide to Signal
Connections (available on our web site at www.mccdaq.com/signals/signals.pdf).
3-3

USB-1024LS User's Guide

Functional Details

Power terminals
The PC +5 V connection (pin 30) is on the bottom screw terminal of the USB-1024LS. Refer to the pinout
diagram on page 3-2 for the location of this pin. This terminal draws power from the USB connector. The +5 V
screw terminal is a +5 volt output that is supplied by the computer.
Caution! The +5 V terminal is an output. Do not connect to an external power supply or you may damage
the USB-1024LS and possibly the computer.
The maximum total output current that can be drawn from all USB-1024LS connections (power and digital
outputs) is 500 mA. This maximum applies to most personal computers and self-powered USB hubs.
Bus-powered hubs and notebook computers may limit the maximum available output current to 100 mA.
Just connecting the USB-1024LS to your computer draws 18 mA of current from the USB +5 V supply. Onceyou start running applications with the USB-1024LS, each DIO bit can draw up to 2.5 mA. The maximum
amount of +5V current available for external use, over and above that required by the USB-1024LS, is thedifference between the total current requirement of the USB-1024LS (based on the application), and theallowed current draw of the PC platform (500 mA for desktop PCs and self-powered hubs, or 100 mA for
bus-powered hubs and notebook computers).
With all outputs at their maximum output current, you can calculate the total current requirement of the USB1024LS USB +5 V as follows:(USB-1024LS @ 18 mA) + (24 DIO @ 2.5 mA ea) = 78 mA

For an application running on a PC or powered hub, this value yields a maximum user current of 500 mA−78
mA = 422 mA. This number is the total maximum available current at the PC+5V screw terminals.
Measurement Computing highly recommends that you figure in a safety factor of 20% below this maximum
current loading for your applications. A conservative, safe user maximum in this case would be 330 mA.
Since laptop computers typically allow up to 100 mA, the USB-1024LS in a fully-loaded configuration may be
above that allowed by the computer. In this case, you must determine the per-pin loading in the application toensure that the maximum loading criteria is met. The per-pin loading is calculated by simply dividing the +5 V
by the load impedance of the pin in question.

Ground terminals
The 8 ground (GND) connections are identical, and provide a common ground for all USB-1024LS functions.
Refer to the pinout diagram on page 3-2 for the location of the GND terminal pins.

Counter terminal
Pin 20 (CTR) is the input to the 32-bit external event counter. Refer to the pinout diagram on page 3-2 for thelocation of this pin. The internal counter increments when the TTL levels transition from low to high. The
counter can count frequencies of up to 1 MHz.

3-4

Chapter 4

Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Digital input / output
Table 1. Digital I/O specifications
Digital type
Number of I/O
Configuration
Pull up/pull-down configuration
Input high voltage
Input low voltage
Output high voltage (IOH = -2.5 mA)
Output low voltage (IOH = -2.5 mA)
Power up / reset state

82C55
24 (Port A0 through Port C7)
2 banks of 8 and 2 banks of 4, or
3 banks of 8
All pins pulled up to Vs via 47K resistors (default). Selection available forpull down to ground. Hardware selectable via zero ohm resistor.
2.0 V min, 5.5 V absolute max
0.8 V max, –0.5 V absolute min
3.0 V min
0.4 V max
Input mode

CounterTable 2. Counter specifications
Counter type
Number of channels
Input source
Input type
Resolution
Schmidt trigger hysteresis
Input leakage current
Maximum input frequency
High pulse width
Low pulse width
Input low voltage
Input high voltage

Event counter1
CTR screw terminal
TTL, rising edge triggered
32 bits
20 mV to 100 mV
±1 µA
1 MHz
500 ns min
500 ns min
0 V min, 1.0 V max
4.0 V min, 15.0 V max

Power
Table 3. Power specifications
Parameter
Supply current (Note 1)+5V USB power available (Note 2)
Output Current (Note 3)
Note 1:

Conditions

Specification

Connected to Self-Powered HubConnected to Bus-Powered HubConnected to Self-Powered HubConnected to Bus-Powered Hub

20 mA typ, 40 mA max
4.5 V min, 5.25 V max
4.1 V min, 5.25 V max
460 mA max
60 mA maxThis is the total current requirement for the USB-1024LS which includes up to 5mA for the
status LED.
4-1

USB-1024LS User's Guide

Specifications

Note 2:

Self-powered refers to USB hubs and hosts with a power supply. Bus-powered refers to USB
hubs and hosts without their own power supply.

Note 3:This refers to the total amount of current that can be sourced from the USB +5V and digital
outputs.

GeneralTable 4. General specifications
Parameter

Conditions

Specification

USB controller clock error

25 °C
0 to 70 °C±30 ppm max±50 ppm max
USB 1.1 low-speed
USB 1.1, USB 2.0

Device type
Device compatibility

Environmental
Table 5. Environmental specifications
Operating temperature range
Storage temperature range
Humidity-0 to 70 °C-40 to 70 °C
0 to 90% non-condensing

Mechanical
Table 6. Mechanical specifications
Dimensions
USB cable length
User connection length

79 mm (L) x 82 mm (W) x 25 mm (H)3 meters max
3 meters max

4-2

USB-1024LS User's Guide

Specifications

Main connector and pin out
Table 7. Connector specifications
Connector type
Wire gauge range

Screw terminal
30-16 AWG
Table 8. Connector pin out

Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

Signal NamePort C0Port C1
Port C2Port C3
Port C4Port C5Port C6Port C7
GND
n/c
n/c
GND
n/c
n/c
GND
n/c
GND
n/c
GND
CTR

Pin
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

Signal NamePort A0
Port A1
Port A2
Port A3
Port A4
Port A5Port A6
Port A7
GND
PC+5V
GND
Port B0
Port B1
Port B2
Port B3
Port B4
Port B5
Port B6
Port B7
GND

4-3

Declaration of Conformity
Manufacturer:
Address:

Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, MA 02766
USA

Measurement Computing Corporation declares under sole responsibility that the productUSB-1024LS
to which this declaration relates is in conformity with the relevant provisions of the following standards or otherdocuments:
EU EMC Directive 89/336/EEC: Electromagnetic Compatibility, EN 61326 (1997) Amendment 1 (1998)
Emissions: Group 1, Class A!

EN 55011 (1990)/CISPR 11: Radiated and Conducted emissions.

Immunity: EN61326, Annex A!
!
!

IEC 1000-4-2 (1995): Electrostatic Discharge immunity, Criteria C.
IEC 1000-4-3 (1995): Radiated Electromagnetic Field immunity Criteria A.
IEC 1000-4-8 (1994): Power Frequency Magnetic Field immunity Criteria A.

Power line and I/O tests to IEC 1000-4-4, IEC 1000-4-5, IEC 1000-4-6, and IEC 1000-4-11 were not required.
The device is DC powered from an I/O cable which is less than three meters long.
Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in
June, 2004. Test records are outlined in Chomerics Test Report #EMI3902.04.
We hereby declare that the equipment specified conforms to the above Directives and Standards.

Carl Haapaoja, Director of Quality Assurance

Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, Massachusetts 02766(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
www.mccdaq.com