Measurement Computing USB-3105 User manual

USB-3105
USB-based Analog Output
User's Guide
November 2017. Rev. 4
© Measurement Computing Corporation

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USB-3105
Trademark and Copyright Information
Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo are
either 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.
© 2017 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 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 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.

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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-3105 ....................................................................................................................6
Overview: USB-3105 features............................................................................................................................6
USB-3105 block diagram ...................................................................................................................................7
Chapter 2
Installing the USB-3105 ........................................................................................................................8
Unpacking...........................................................................................................................................................8
Installing the software ........................................................................................................................................8
Installing the hardware .......................................................................................................................................8
Calibrating the hardware.....................................................................................................................................8
Chapter 3
Functional Details .................................................................................................................................9
External components ..........................................................................................................................................9
USB connector.................................................................................................................................................................. 9
Status LED........................................................................................................................................................................ 9
Power LED ....................................................................................................................................................................... 9
Screw terminal banks.......................................................................................................................................................10
Analog voltage output terminals (VOUT0 to VOUT15)..................................................................................................11
Digital I/O terminals (DIO0 to DIO7)..............................................................................................................................11
Digital I/O control terminal (DIO CTL) for pull-up/down configuration ........................................................................12
Ground terminals (AGND, DGND) .................................................................................................................................12
Synchronous DAC load terminal (SYNCLD)..................................................................................................................12
Counter terminal (CTR)...................................................................................................................................................12
Power terminal (+5V) ......................................................................................................................................................12
Synchronizing multiple units............................................................................................................................13
Chapter 4
Specifications......................................................................................................................................14
Analog voltage output ......................................................................................................................................14
Analog output calibration .................................................................................................................................15
Digital input/output...........................................................................................................................................15
Synchronous DAC Load...................................................................................................................................16
Counter .............................................................................................................................................................16
Memory ............................................................................................................................................................17
Microcontroller.................................................................................................................................................17
Power ................................................................................................................................................................17
USB specifications ...........................................................................................................................................17
Environmental ..................................................................................................................................................17
Mechanical .......................................................................................................................................................18
Screw terminal connector .................................................................................................................................18

USB-3105 User's Guide
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EU Declaration of Conformity............................................................................................................19

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Preface
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Measurement Computing USB-3105 data acquisition device and lists device
specifications.
Conventions in this user's guide
For more information
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 is used for the names of objects on a screen, such as buttons, text boxes, and checkboxes.
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
Additional information about USB-3105 hardware is available on our website at www.mccdaq.com. You can
also contact Measurement Computing Corporation with specific questions.
Knowledgebase: kb.mccdaq.com
Tech support form: www.mccdaq.com/support/support_form.aspx
Email: [e-mail]
Phone: [phone] and follow the instructions for reaching Tech Support
For international customers, contact your local distributor. Refer to the International Distributors section on our
web site at www.mccdaq.com/International.

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Chapter 1
Introducing the USB-3105
Overview: USB-3105 features
This user's guide contains all of the information you need to connect the USB-3105 to your computer and to the
signals you want to control. The USB-3105 is part of the Measurement Computing brand of USB-based data
acquisition products.
The USB-3105 is a USB 2.0 full-speed device that is supported under popular Microsoft®Windows®operating
systems. The USB-3105 is fully compatible with both USB 1.1 and USB 2.0 ports.
The USB-3105 provides 16 channels of analog voltage output, eight digital I/O connections, and one 32-bit
event counter.
The USB-3105 has four quad (4-channel) 16-bit digital-to-analog converters (DAC). You set the voltage output
range of each DAC channel independently with software for either bipolar or unipolar. The bipolar range is
±10 V, and the unipolar range is 0 to 10 V. The analog outputs may be updated individually or simultaneously.
A bidirectional synchronization connection allows you to simultaneously update the DAC outputs on multiple
devices.
The USB-3105 features eight bidirectional digital I/O connections. You can configure the DIO lines as input or
output in one 8-bit port. All digital pins are floating by default. A screw terminal connection is provided for
pull-up (+5 V) or pull-down (0 volts) configuration.
The 32-bit counter can count TTL pulses.
The USB-3105 is powered by the +5 volt USB supply from your computer. No external power is required. All
I/O connections are made to the screw terminals located along each side of the USB-3105.
Figure 1. USB-3105

USB-3105 User's Guide Introducing the USB-3105
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USB-3105 block diagram
USB-3105 functions are illustrated in the block diagram shown here.
Figure 2. USB-3105 block diagram
Screw terminal I/O connector
SPI
USB
Microcontroller
Screw terminal I/O connector
8
SYNCLD
Event Counter
1 channel
(32-bit) 1
D/A
D/A
D/A
D/A
DIO
8channels
16
4
4
4
4
1
Analog Voltage
Output
16 channels (16-bit)
4-channel
Quad
16
USB
Full-speed
USB 2.0
Compliant
Interface

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Chapter 2
Installing the USB-3105
Unpacking
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the device 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.
Contact us immediately if any components are missing or damaged.
Installing the software
Refer to the MCC DAQ Quick Start and the USB-3105 product page on our website for information about the
software supported by the USB-3105.
Install the software before you install your device
The driver needed to run the USB-3105 is installed with the software. Therefore, you need to install the
software package you plan to use before you install the hardware.
Installing the hardware
To connect the USB-3105 to your system, connect the USB cable to an available USB port on the computer or
to an external USB hub connected to the computer. Connect the other end of the USB cable to the USB
connector on the device. No external power is required.
When connected for the first time, a Found New Hardware dialog opens when the operating system detects the
device. When the dialog closes, the installation is complete. The Status LED on the USB-3105 turns on after
the device is successfully installed.
If the Power LED turns off
If communication is lost between the device and the computer, the device LED turns off. To restore
communication, disconnect the USB cable from the computer and then reconnect it. This should restore
communication, and the LED should turn on.
Calibrating the hardware
The Measurement Computing Manufacturing Test department performs the initial factory calibration. Return
the device to Measurement Computing Corporation when calibration is required. The recommended calibration
interval is one year.

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Chapter 3
Functional Details
External components
The USB-3105 has the following external components, as shown in Figure 3.
USB connector
Status LED
Power LED
Screw terminal banks (2)
Figure 3. USB-3105 external components
USB connector
The USB connector provides power and communication to the USB-3105. The voltage supplied through the
USB connector is system-dependent, and may be less than 5 V. No external power supply is required.
Status LED
The Status LED indicates the communication status of the USB-3105. It flashes when data is being transferred,
and is off when the USB-3105 is not communicating. This LED uses up to 10 mA of current and cannot be
disabled.
Power LED
The power LED lights up when the USB-3105 is connected to a USB port on your computer or to an external
USB hub that is connected to your computer.

USB-3105 User's Guide Functional Details
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Screw terminal banks
The USB-3105 has two rows of screw terminals—one row on the top edge of the housing, and one row on the
bottom edge. Each row has 28 connections. Use 16 AWG to 30 AWG wire gauge when making screw terminal
connections. Pin numbers are identified in Figure 4.
Figure 4. USB-3105 screw terminal pinout numbering
Screw terminal – pins 1-28
The screw terminals on the bottom edge of the USB-3105 (pins 1 to 28) provide the following connections:
Eight analog voltage output connections (VOUT0, VOUT2, VOUT4, VOUT6, VOUT8, VOUT10, VOUT12,
VOUT14)
Four analog ground connections (AGND)
Eight digital I/O connections (DIO0 to DIO7)
Screw terminal – pins 29-56
The screw terminals on the top edge of the USB-3105 (pins 29 to 56) provide the following connections:
Eight analog voltage output connections (VOUT1, VOUT3, VOUT5, VOUT7, VOUT9, VOUT11, VOUT13,
VOUT15)
Four analog ground connections (AGND)
One SYNC terminal for external clocking and multi-unit synchronization (SYNCLD)
Three digital ground connections (DGND)
One external event counter connection (CTR)
One digital I/O pull-down resistor connection (DIO CTL)
One voltage output power connection (+5V)
Pin 56Pin 29
Pin 28Pin 1