1
USB-DIO24/37
Digital Input/Output
User's Guide
Document Revision 3, January, 2011
© Copyright 2011, Measurement Computing Corporation
HM USB-DIO24_37.doc
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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-DIO24/37 ............................................................................................................. 6
Overview: USB-DIO24/37 features.................................................................................................................... 6
USB-DIO24/37 block diagram ........................................................................................................................... 6
Software features ................................................................................................................................................ 6
Connecting a USB-DIO24/37 to your computer is easy ..................................................................................... 7
Chapter 2
Installing the USB-DIO24/37 ................................................................................................................. 8
What comes with your USB-DIO24/37 shipment?............................................................................................. 8
Hardware .......................................................................................................................................................................... 8
Additional Documentation ................................................................................................................................................ 8
Optional components ........................................................................................................................................................ 8
Unpacking the USB-DIO24/37 ........................................................................................................................... 9
Installing the software ........................................................................................................................................ 9
Installing the USB-DIO24/37 ............................................................................................................................. 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
Mechanical Drawings ....................................................................................................................................... 14
Chapter 4
Specifications ...................................................................................................................................... 15
Digital input/output........................................................................................................................................... 15
Counter ............................................................................................................................................................. 15
Data transfer rates ............................................................................................................................................. 16
Power ................................................................................................................................................................ 16
General ............................................................................................................................................................. 16
Environmental .................................................................................................................................................. 16
Mechanical ....................................................................................................................................................... 17
Main connector and pinout ............................................................................................................................... 17
Declaration of Conformity .................................................................................................................. 18
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-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.
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-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 device supported under popular Microsoft® Windows® operating
systems. It is designed for USB 1.1 ports, and is fully compatible 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 47 kΩ resistors.
An on-board industry standard 82C55 programmable peripheral interface chip provides the 24 discrete digital
I/O lines in four ports. You 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 the system's plug-and-play software.
USB-DIO24/37 block diagram
USB-DIO24/37 functions are illustrated in the block diagram shown here.
Figure 1. USB-DIO24/37 functional block diagram
Software features
For information on the features of InstaCal and the other software included with your USB-DIO24/37, refer to
the Quick Start Guide that shipped with your device.
6
USB-DIO24/37 User's Guide Introducing 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."
7
U
S
B
-
D
I
O
2
4
/
3
7
R
E
V
.
1
C37FFS-x
C37FF-x
Installing the USB-DIO24/37
What comes with your USB-DIO24/37 shipment?
The following items are shipped with the USB-DIO24/37.
Hardware
USB-DIO24/37
Chapter 2
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-DIO24/37 and information regarding installation of that software.
Please read this booklet completely before installing any software or hardware.
Optional components
If you ordered any of the following products with your board, they should be included with your shipment.
Cables
8
USB-DIO24/37 User's Guide Installing the USB-DIO24/37
Signal termination and conditioning accessories
MCC provides signal termination and conditioning boards for use with the USB-DIO24/37. Refer to the
"Field wiring, signal termination and conditioning" section on page 11 for a list of accessory products.
Unpacking the USB-DIO24/37
As with any electronic device, 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 is damaged, notify Measurement Computing Corporation immediately by phone, fax, or
e-mail. For international customers, contact your local distributor where you purchased the USB-DIO24/37.
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
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.
Installing the USB-DIO24/37
To connect the USB-DIO24/37 to the system, connect the USB cable to an available USB port on the computer
or to an external USB hub connected to the computer.
When you connect the USB-DIO24/37 for the first time, multiple Found New Hardware popup balloons open
when the operating system detects the device.
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.
9
USB-DIO24/37 User's Guide Installing the USB-DIO24/37
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
Connecting the board for I/O operations
Connectors and cables
The table below lists the board I/O connector type, compatible cables, and compatible accessory products for
the USB-DIO24/37.
Board connectors, cables, and accessory equipment
Connector pinout
Figure 2. Connector pinout
10
USB-DIO24/37 User's Guide Installing the USB-DIO24/37
37
19
20
1
20
1
37
19
37
20
1
20
1
37
19
20
1
37
19
20
1
37
19
The red stripe
identifies pin # 1
Cables
Figure 3. C37FFS-x cable
Figure 4. C37FF-x cable
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.
CIO-MINI37 – 37-pin screw terminal board.
CIO-MINI37-VERT – 37-pin screw terminal board with vertical 37-pin male D connector.
CIO-ERB08 – Eight Form C, 6A relays.
CIO-SERB08 – 8 Form C relays, 10 Amp, relay accessory board with socketed and field-replaceable
relays.
CIO-ERB24 – 24 Form C, 6A relays.
CIO-SPADE50 — 16" X 4" termination panel which mates with both 37-pin and 50-pin connectors.
SSR-RACK08 – 24-channel solid state I/O module rack.
SSR-RACK24 – 24-channel solid state I/O module rack.
Details on these products are available on our web site at www.mccdaq.com/products/signal_conditioning.aspx.
11
Functional Details
Components
The USB-DIO24/37 has the following components, as shown in Figure 5.
37-pin I/O connector
USB connector
LED
Chapter 3
Figure 5. 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. 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, and can count frequencies of up to 1 MHz.
The six ground (GND) connections are identical and provide a common ground for all device 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
12
USB-DIO24/37 User's Guide Functional Details
LED status
Description
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.
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. The table below explains the function of the USB-DIO24/37 LED.
LED Illumination
Pull-up resistors
Each digital port has an internal 47 kΩ 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 USBDIO24/37, 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 USBDIO24/37 +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.
13
USB-DIO24/37 User's Guide Functional Details
Mechanical Drawings
Figure 6. Circuit board dimensions
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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 = -2.5 mA)
0.4V max
Power up / reset state
Input mode
Pin name (Note 1)
CTR
Counter type
Event counter
Number of channels
1
Input type
TTL, rising edge triggered
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
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
Chapter 4
Counter
Note 1: CTR is a Schmitt trigger input
Table 2. Counter specifications
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USB-DIO24/37 User's Guide 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)
Parameter
Conditions
Specification
Supply current (Note 2)
20 mA typ, 40 mA max
+5V USB power available (Note3)
Connected to Self-Powered Hub
4.5 V min, 5.25 V max
Connected to Bus-Powered Hub
4.1 V min, 5.25 V max
Output current (Note 4)
Connected to Self-Powered Hub
460 mA max
Connected to Bus-Powered Hub
60 mA max
Parameter
Conditions
Specification
USB controller clock error
25 °C
±30 ppm max
0 to 70 °C
±50 ppm max
Device type
USB 1.1 low-speed
Device compatibility
USB 1.1, USB 2.0
Operating temperature range
0 to 70 °C
Storage temperature range
-40 to 85 °C
Humidity
0 to 90% non-condensing
Data transfer rates
Table 3. Data transfer rate specifications
Power
Table 4 . Power specifications
Note 2: This is the total current requirement for the USB-DIO24/37 which includes up to 5 mA for the status
LED.
Note 3: 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 4: This refers to the total amount of current that can be sourced from the USB +5V and digital outputs.
General
Table 5. General specifications
Environmental
Table 6. Environmental specifications
16
USB-DIO24/37 User's Guide 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
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 cables)
SCB-37
CIO-MINI37
CIO-MINI37-VERT
CIO-ERB08
CIO-SERB08
CIO-ERB24
CIO-SPADE50
SSR-RACK08
SSR-RACK24
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
Mechanical
Table 7. Mechanical specifications
Main connector and pinout
Table 8. Connector specifications
Table 9. Connector pinout
17
Declaration of Conformity
Manufacturer: Measurement Computing Corporation
Address: 10 Commerce Way
Suite 1008
Norton, MA 02766
USA
Measurement Computing Corporation declares under sole responsibility that the product
USB-DIO24/37
to which this declaration relates is in conformity with the relevant provisions of the following standards or other
documents:
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 61000-4-2 (1995): Electrostatic Discharge immunity, Criteria C.
IEC 61000-4-3 (1995): Radiated Electromagnetic Field immunity Criteria A.
IEC 61000-4-8 (1994): Power Frequency Magnetic Field immunity Criteria A.
Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in
February, 2006. Test records are outlined in Chomerics Test Report #EMI4445.06.
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
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