Measurement Computing USB-DIO24/37 User manual

i

USB-DIO24/37
Digital Input/Output
User’s Guide
Document Revision 1, July, 2005
© Copyright 2005, Measurement Computing Corporation

Your new Measurement Computing product comes with a fantastic extra —
Management committed to your satisfaction!
Refer to www.mccdaq.com/execteam.html for the names, titles, and contact information of each key executive at
Measurement Computing.
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
two missions:
To offer the highest-quality, computer-based data acquisition, control, and GPIB hardware and software
available—at the best possible price.
To offer our customers superior post-sale support—FREE. Whether providing unrivaled telephone technical and
sales support on our latest product offerings, or continuing that same first-rate support on older products and
operating systems, we’re committed to you!
Lifetime warranty: Every hardware product manufactured by Measurement Computing Corporation is warranted against
defects in materials or workmanship for the life of the product. Products found defective are repaired or replaced promptly.
Lifetime Harsh Environment Warranty®: We will replace any product manufactured by Measurement Computing
Corporation that is damaged (even due to misuse) for only 50% of the current list price. I/O boards face some tough
operating conditionssome more severe than the boards are designed to withstand. When a board becomes damaged, just
return the unit with an order for its replacement at only 50% of the current list price. We don’t need to profit from your
misfortune. By the way, we honor this warranty for any manufacturer’s board that we have a replacement for.
30 Day Money Back Guarantee: You may return any Measurement Computing Corporation product within 30 days of
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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.
ii
HM USB-DIO24-37.doc

Trademark and Copyright Information
TracerDAQ, InstaCal, Universal Library, Harsh Environment Warranty, Measurement Computing Corporation, and the
Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation.
SoftWIRE is a registered trademark of SoftWIRE Technology, Inc.
Windows, Microsoft, and Visual Studio are either trademarks or registered trademarks of Microsoft Corporation. LabVIEW
is a trademark of National Instruments. 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 the written approval of the CEO of 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.
iii

Table of Contents
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-DIO24/37......................................................................................................... 1-1
Overview: USB-DIO24/37 features................................................................................................................ 1-1
USB-DIO24/37 block diagram....................................................................................................................... 1-1
Software features ............................................................................................................................................ 1-2
Connecting a USB-DIO24/37 to your computer is easy................................................................................. 1-2
Chapter 2
Installing the USB-DIO24/37............................................................................................................. 2-1
What comes with your USB-DIO24/37 shipment?......................................................................................... 2-1
Hardware ....................................................................................................................................................................... 2-1
Software......................................................................................................................................................................... 2-1
Documentation............................................................................................................................................................... 2-1
Optional components ..................................................................................................................................................... 2-2
Unpacking the USB-DIO24/37....................................................................................................................... 2-2
Installing the software .................................................................................................................................... 2-2
Installing the USB-DIO24/37 ......................................................................................................................... 2-3
Connecting the USB-DIO24/37 to your system............................................................................................................. 2-3
Connecting the board for I/O operations ........................................................................................................ 2-3
Connectors, cables – main I/O connector....................................................................................................................... 2-3
Pin out – main I/O connector ......................................................................................................................................... 2-4
Cables ............................................................................................................................................................................ 2-4
Field wiring, signal termination and conditioning ......................................................................................................... 2-5
Chapter 3
Functional Details ............................................................................................................................. 3-1
Components.................................................................................................................................................... 3-1
37-pin I/O connector...................................................................................................................................................... 3-1
USB connector............................................................................................................................................................... 3-2
LED ............................................................................................................................................................................... 3-2
Pull-up resistors ............................................................................................................................................................. 3-2
Power consumption ........................................................................................................................................ 3-2
Chapter 4
Specifications.................................................................................................................................... 4-1
Digital input/output......................................................................................................................................... 4-1
Counter ........................................................................................................................................................... 4-1
Data transfer rates........................................................................................................................................... 4-1
Power.............................................................................................................................................................. 4-2
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 guide
This user's guide explains how to install, configure and use the USB-DIO24/37 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.
< # : # > 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
The following electronic documents provide information that is relevant to the operation of the USB-
DIO24/37.
MCC's Specifications: USB-DIO24/37 (the PDF version of Chapter 5 in this guide) is available on
our web site at www.mccdaq.com/pdfs/PCI-DIO24-37.pdf.
MCC's Quick Start Guide is available on our web site at www.mccdaq.com/PDFmanuals/DAQ-
Software-Quick-Start.pdf.
MCC's Guide to Signal Connections is available on our web site at
www.mccdaq.com/signals/signals.pdf.
MCC's Universal Library User's Guide is available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-user-guide.pdf.
MCC's Universal Library Function Reference is available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-functions.pdf.
MCC's Universal Library for LabVIEW™User’s Guide is available on our web site at
www.mccdaq.com/PDFmanuals/SM-UL-LabVIEW.pdf.
This user's manual is also available on our web site at www.mccdaq.com/PDFmanuals/USB-DIO24-
37.pdf.
v

Chapter 1
Introducing the USB-DIO24/37
Overview: USB-DIO24/37 features
This manual explains how to install, configure and use the USB-DIO24/37 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-DIO24/37 is a USB 2.0 low-speed module supported under Microsoft® Windows® 98 (2nd
edition), Windows ME, Windows 2000, and Window XP. 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-DIO24/37 features 24 bits of digital I/O and one 32-bit external event counter. The device is
powered by the +5 volt USB supply. No external power is required. All I/O connections are made to a 37-
pin connector. Digital channels are pulled up to +5V with 47k resistors.
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-DIO24/37 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-DIO24/37 block diagram
USB-DIO24/37 functions are illustrated in the block diagram shown here.
PORT A
Control
PORT A (7:0)
PORT B (7:0)
PORT CH (3:0)
PORT B
PORT CH
PORT CL
PORT CL (3:0)
USB
Microcontroller
500 mA
USB 2.0
compliant
interface
8
37-Pin I/O Connector
32-bit
Event Counter
1 channel
1
82C55 DIO
Figure 1-1. USB-DIO24/37 functional block diagram
1-1

USB-DIO24/37 User's Guide Introducing the USB-DIO24/37
Software features
The following software ships with the USB-DIO24/37 free of charge.
InstaCal installation, calibration, and test utility
TracerDAQ™ suite of virtual instruments
SoftWIRE® for Visual Studio® .NET graphical programming
MCC DAQ Components for VS .NET (installed with SoftWIRE® for VS .NET)
For information on the features of InstaCal, TracerDAQ, and SoftWIRE, refer to the Quick Start Guide
booklet that ships with the USB-DIO24/37.
Connecting a USB-DIO24/37 to your computer is easy
Installing a data acquisition device has never been easier.
The USB-DIO24/37 relies upon the Microsoft Human Interface Device (HID) class drivers. The HID
class drivers 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 for your USB-DIO24/37. No third-party device driver is required.
The USB-DIO24/37 is plug-and-play. There are no jumpers to position, DIP switches to set, or
interrupts to configure.
You can connect the USB-DIO24/37 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 and configures the necessary software. You can connect and power multiple HID
peripherals to your system using 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.
Data can flow two ways between a computer and peripheral over USB connections.
Make sure that you have the latest Windows Updates installed for your USB driver, particularly "XP
Hotfix KB822603."
1-2

Chapter 2
Installing the USB-DIO24/37
What comes with your USB-DIO24/37 shipment?
As you unpack your board, make sure each of the items shown below is included.
Hardware
USB-DIO24/37
USB-DIO24/37
REV.1
USB cable (2 meter length)
Software
The Measurement Computing Data Acquisition Software CD contains the following software:
InstaCal installation, calibration, and test utility
TracerDAQ suite of virtual instruments
SoftWIRE for VS .NET
SoftWIRE MCC DAQ Components for .NET
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). Please read this booklet completely
before installing any software and hardware.
2-1

USB-DIO24/37 User's Guide Installing the USB-DIO24/37
Optional components
If you ordered any of the following products with your board, they should be included with your
shipment.
Universal Library
Universal Library™ Data Acquisition and Control Programming Tools (also includes the InstaCal
utility, the Universal Library User's Guide, and the Universal Library Function Reference)
Cables
C37FFS-x
C37FF-x
Signal termination and conditioning accessories
MCC provides signal termination and conditioning boards that you can use with the USB-DIO24/37.
Refer to the "Field wiring, signal termination and conditioning" section on page 2-5 for a complete list of
compatible accessory products.
Unpacking the USB-DIO24/37
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the USB-DIO24/37 from its packaging, ground yourself using a wrist strap
or by simply touching the computer chassis or other grounded object to eliminate any stored static charge.
If your USB-DIO24/37 arrives already damaged, notify Measurement Computing Corporation
immediately by phone, fax, or email. For international customers, contact your local distributor where
you purchased the USB-DIO24/37.
Phone: [phone] and follow the instructions for reaching Tech Support.
Fax: [phone] to the attention of Tech Support
Email: [e-mail]
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-Software-Quick-Start.pdf.
2-2

USB-DIO24/37 User's Guide Installing the USB-DIO24/37
Installing the USB-DIO24/37
Connecting the USB-DIO24/37 to your system
To connect the USB-DIO24/37 to your system, 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 communication to
the USB-DIO24/37.
When you connect the USB-DIO24/37 for the first time, multiple Found New Hardware popup balloons
(Windows XP) or dialogs (other Windows versions) appear as the USB-DIO24/37 is detected.
When installation is complete, the USB LED should flash and then remain lit. This indicates that
communication is established between the USB-DIO24/37 and your computer.
If the USB LED turns off
If the USB LED is lit but then turns off, the computer has lost communication with the USB-DIO24/37.
To restore communication, disconnect the USB cable from the computer, and then reconnect it. This
should restore communication, and the USB LED should turn back on.
Caution! Do not disconnect any device from the USB bus while the computer is communicating with
the USB-DIO24/37, or you may lose data and/or your ability to communicate with the USB-
DIO24/37.
Connecting the board for I/O operations
Connectors, cables – main I/O connector
Table 2-1 lists the board I/O connector type, compatible cables, and compatible accessory products for
the USB-DIO24/37.
Table 2-1. Board connectors, cables, and accessory equipment
Connector type 37-pin D-type connector
Compatible cables C37FF-x unshielded ribbon cable. x = length in feet.
C37FFS-x cable shielded round cable. x = length in feet.
Compatible accessory products (with the
C37FFS-x and C37FF-x cables)
SCB-37
CIO-MINI37
CIO-MINI37-VERT
CIO-ERB08
CIO-SERB08
CIO-ERB24
CIO-SPADE50
SSR-RACK08
SSR-RACK24
2-3

USB-DIO24/37 User's Guide Installing the USB-DIO24/37
Pin out – main I/O connector
1CTR
2NC
3PortBBit7
4PortBBit6
5PortBBit5
6PortBBit4
7PortBBit3
8PortBBit2
9PortBBit1
10 Port B Bit 0
11 GND
12 NC
13 GND
14 NC
15 GND
16 NC
17 GND
18 +5
19 GND
+5 20
GND 21
Port C Bit 7 22
Port C Bit 6 23
Port C Bit 5 24
Port C Bit 4 25
Port C Bit 3 26
Port C Bit 2 27
Port C Bit 1 28
Port C Bit 0 29
Port A Bit 7 30
Port A Bit 6 31
Port A Bit 5 32
Port A Bit 4 33
Port A Bit 3 34
Port A Bit 2 35
Port A Bit 1 36
Port A Bit 0 37
Figure 2-2. Main I/O connector pin out
Cables
37
19
20 1
20
1
37
19
37
20 1
20
1
37
19
Figure 2-3. C37FFS-xcable
20
1
37
19
20
1
37
19
The red stripe
identifies pin # 1
Figure 2-4. C37FF-xcable
2-4

USB-DIO24/37 User's Guide Installing the USB-DIO24/37
Field wiring, signal termination and conditioning
You can connect the USB-DIO24/37 to the following accessory boards using the C37FF-x or C37FFS-x
cable.
SCB-37 – 37-conductor, shielded signal connection/screw terminal box. Details on this product are
available on our web site at www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=196&pf_id=1166.
CIO-MINI37 – 37-pin screw terminal board. Details on this product are available on our web site at
www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=102&pf_id=1543.
CIO-MINI37-VERT – 37-pin screw terminal board with vertical 37-pin male D connector. Details on
this product are available on our web site at
www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=102&pf_id=256.
CIO-ERB08 – Eight Form C, 6A relays. Details on this product are available on our web site at
www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=123&pf_id=240.
CIO-SERB08 – 8 Form C relays, 10 Amp, relay accessory board with socketed and field-replaceable
relays. Details on this product are available on our web site at
www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=123&pf_id=680.
CIO-ERB24 – 24 Form C, 6A relays. Details on this product are available on our web site at
www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=123&pf_id=241.
CIO-SPADE50 — 16" X 4" termination panel which mates with both 37-pin and 50-pin connectors.
Details on this product are available on our web site at www.mccdaq.com/pdfs/screw.pdf.
SSR-RACK08 – 24-channel solid state I/O module rack. Details on this product are available on our
web site at www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=122&pf_id=620.
SSR-RACK24 – 24-channel solid state I/O module rack. Details on this product are available on our
web site at www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=122&pf_id=1193.
2-5

Chapter 3
Functional Details
Components
The USB-DIO24/37 has the following components, as shown in Figure 3-1.
37-pin I/O connector
USB connector
LED
LED
37-pin I/O connector
USB
Connector
Figure 3-1. USB-DIO24/37 components
37-pin I/O connector
The 37-pin connector provides 24 digital I/O, one counter, six ground, and two 5V power connections.
The digital I/O is configured as two 8-bit and two 4-bit ports based on the 82C55 specification. You
can configure each port independently for input (default) or output.
The CTR signal is the input to the 32-bit external event counter. The internal counter increments
when the digital input level transitions from low to high. The counter can count frequencies of up to
1 MHz.
The six ground (GND) connections are identical, and provide a common ground for all USB-
DIO24/37 functions.
The two power connections draw power from the USB connector. The +5 pin is a +5 volt output that
is supplied by the computer.
Caution! The +5 V pin is an output. Do not connect to an external power supply or you may damage
the USB-DIO24/37 and possibly the computer
3-1

USB-DIO24/37 User's Guide Functional Details
USB connector
The USB connector provides +5 V power and communication. 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 indicates the communication status of the USB-DIO24/37. It uses up to 5 mA of current and
cannot be disabled. Ta explains the function of the USB-DIO24/37 LED.ble 3-2
Table 3-2 LED Illumination
When the LED is… It indicates…
Steady green The USB-DIO24/37 is connected to a computer or external USB hub.
Blinks continuously Data is being transferred.
Blinks three times Initial communication is established between the USB-DIO24/37 and the computer.
Pull-up resistors
Each digital port has an internal 47k pull-up resistor network. All digital pins are pulled up to +5 V (high
logic level) on power up and reset.
Power consumption
The maximum total output current that can be drawn from all USB-DIO24/37 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.
Once you start running applications with the USB-DIO24/37, 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-
DIO24/37, is the difference between the total current requirement of the USB-DIO24/37 (based on the
application), and the allowed 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
USB-DIO24/37 +5 V as follows:
(USB-DIO24/37 @ 40 mA) + (24 DIO @ 2.5 mA ea) = 100 mA
For an application running on a PC or powered hub, this value yields a maximum user current of
500 mA−100 mA = 400 mA. This number is the total maximum available current at the +5 output pins.
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
320 mA.
Since laptop computers typically allow up to 100 mA, the USB-DIO24/37 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 to ensure 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.
3-2

Chapter 4
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Digital input/output
Table 4-1. Digital I/O specifications
Digital type 82C55
Number of I/O 24 (Port A Bit 0 through Port C Bit7)
Configuration 2 banks of 8 and 2 banks of 4 or
3 banks of 8
Pull up/pull-down configuration All pins pulled up to Vs via 47K resistors (default). Selection available for
pull down to ground. Hardware selectable via zero ohm resistor.
Input high voltage 2.0 V min, 5.5 V absolute max
Input low voltage 0.8 V max, –0.5 V absolute min
Output high voltage (IOH = -2.5 mA) 3.0 V min
Output low voltage (IOH = -2.5mA) 0.4V max
Power up / reset state Input mode
Counter
Table 4-2. Counter specifications
Pin name (Note 1) CTR
Counter type Event counter
Number of channels 1
Input source CTR screw terminal
Resolution 32 bits
Schmidt trigger hysteresis 20 mV to 100 mV
Input leakage current ±1 µA
Maximum input frequency 1 MHz
High pulse width 500 ns min
Low pulse width 500 ns min
Input low voltage 0 V min, 1.0 V max
Input high voltage 4.0 V min, 15.0 V max
Note 1: CTR is a Schmitt trigger input
Data transfer rates
Table 4-3. Data transfer rate specifications
Digital I/O transfer rates (software paced)
Digital input 62 port reads or single bit reads per second (typical)
Digital output 125port writes or single bit writes per second (typical)
Counter/timer read/write rates (software paced)
Counter read 62 port reads per second (typical)
Counter clear 125 port writes per second (typical)
4-1

USB-DIO24/37 User's Guide Specifications
Power
Table 4-4 . Power specifications
Parameter Conditions Specification
Supply current (Note 2) 20mA typ, 40 mA max
Connected to Self-Powered Hub 4.5 V min, 5.25 V max+5V USB power available (Note 3)
Connected to Bus-Powered Hub 4.1 V min, 5.25 V max
Connected to Self-Powered Hub 460 mA maxOutput current (Note 4)
Connected to Bus-Powered Hub 60 mA max
Note 2:
Note 3:
Note 4:
This is the total current requirement for the USB-DIO24/37 which includes up to 5 mA for
the status LED.
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.
This refers to the total amount of current that can be sourced from the USB +5V and digital
outputs.
General
Table 4-5. General specifications
Parameter Conditions Specification
25 °C ±30 ppm maxUSB controller clock error
0 to 70 °C ±50 ppm max
Device type USB 1.1 low-speed
Device compatibility USB 1.1, USB 2.0
Environmental
Table 4-6. Environmental specifications
Operating temperature range 0 to 70 °C
Storage temperature range -40 to 85 °C
Humidity 0 to 90% non-condensing
Mechanical
Table 4-7. Mechanical specifications
Dimensions 119 mm (L) x 84 mm (W) x 14 mm(H)
USB cable length 3 meters max
USB cable type A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG VBUS/GND, min
28 AWG D+/D-)
User connection length 3 meters max
4-2

USB-DIO24/37 User's Guide Specifications
Main connector and pin out
Table 4-8. Connector specifications
Connector type 37-Pin D-type
Compatible cables C37FF-x unshielded ribbon cable. x = length in feet.
C37FFS-x cable shielded round cable. x = length in feet.
Compatible accessory products (with the
C37FFS-x and C37FF-x cable)
SCB-37
CIO-MINI37
CIO-MINI37-VERT
CIO-ERB08
CIO-SERB08
CIO-ERB24
CIO-SPADE50
SSR-RACK08
SSR-RACK24
Table 4-9. Connector pin out
Pin Signal Name Pin Signal Name
1 CTR 20 +5
2 NC 21 GND
3 Port B Bit 7 22 Port C Bit 7
4 Port B Bit 6 23 Port C Bit 6
5 Port B Bit 5 24 Port C Bit 5
6 Port B Bit 4 25 Port C Bit 4
7 Port B Bit 3 26 Port C Bit 3
8 Port B Bit 2 27 Port C Bit 2
9 Port B Bit 1 28 Port C Bit 1
10 Port B Bit 0 29 Port C Bit 0
11 GND 30 Port A Bit 7
12 NC 31 Port A Bit 6
13 GND 32 Port A Bit 5
14 NC 33 Port A Bit 4
15 GND 34 Port A Bit 3
16 NC 35 Port A Bit 2
17 GND 36 Port A Bit 1
18 +5 37 Port A Bit 0
19 GND
4-3

EC Declaration of Conformity
We, Measurement Computing Corporation, declare under sole responsibility that the product
USB-DIO24/37 USB-based 24-bit digital IO board
Part Number Description
to which this declaration relates, meets the essential requirements, is in conformity with, and CE marking
has been applied according to the relevant EC Directives listed below using the relevant section of the
following EC standards and other informative documents:
EU EMC Directive 89/336/EEC: Essential requirements relating to electromagnetic compatibility.
EN 55022 Class B (1995): Radiated and conducted emission requirements for information technology
equipment.
ENV 50204 (1995): Radio-frequency electromagnetic field immunity.
EN 55024 (1998): EC generic immunity requirements.
EN 50082-1 (1997): EC generic immunity requirements.
EN 61000-4-2 (1995): Electrostatic discharge immunity.
EN 61000-4-3 (1997) ENV 50204 (1996): RF immunity.
EN 61000-4-4 (1995): Electric fast transient burst immunity.
EN 61000-4-5 (1995): Surge immunity.
EN 61000-4-6 (1996): Radio frequency common mode immunity.
EN 61000-4-8 (1994): Power frequency magnetic field immunity.
EN 61000-4-11 (1994): Voltage dip and interrupt immunity.
Carl Haapaoja, Vice-President of Design Verification

Measurement Computing Corporation
16 Commerce Boulevard,
Middleboro, Massachusetts 02346
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E-mail: [email protected]
www.mccdaq.com