Measurement Computing USB-3114 User manual

USB-3114
USB-based Analog Output
User Guide
Document Revision 4A, January, 2011
© Copyright 2011, Measurement Computing Corporation

3
HM USB-3114.doc
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.
© 2011 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.

4
Table of Contents
Preface
About this User's Guide.......................................................................................................................6
What you will learn from this user's guide.........................................................................................................6
Conventions in this user's guide .........................................................................................................................6
Where to find more information.........................................................................................................................6
Chapter 1
Introducing the USB-3114....................................................................................................................7
Overview: USB-3114 features ...........................................................................................................................7
USB-3114 block diagram...................................................................................................................................8
Software features................................................................................................................................................8
Chapter 2
Installing the USB-3114........................................................................................................................9
What comes with your USB-3114 shipment? ....................................................................................................9
Hardware .......................................................................................................................................................................... 9
Additional documentation................................................................................................................................................10
Unpacking the USB-3114.................................................................................................................................10
Installing the software ......................................................................................................................................10
Installing the hardware .....................................................................................................................................10
Connecting the AC power adapter...................................................................................................................................10
Connecting the USB-3114 to your system.......................................................................................................................11
Calibrating the USB-3114................................................................................................................................11
Chapter 3
Functional Details...............................................................................................................................12
External components ........................................................................................................................................12
USB connector.................................................................................................................................................................12
USB LED.........................................................................................................................................................................12
Power connector ..............................................................................................................................................................12
Power LED ......................................................................................................................................................................13
Screw terminal banks.......................................................................................................................................................13
Analog voltage output terminals (VOUT0 to VOUT15) .................................................................................................14
Digital I/O terminals (DIO0 to DIO7) .............................................................................................................................14
Digital I/O control terminal (DIO CTL) for pull-up/down configuration........................................................................15
Ground terminals (AGND, DGND).................................................................................................................................15
Synchronous DAC load terminal (SYNCLD)..................................................................................................................15
Counter terminal (CTR)...................................................................................................................................................15
Power terminal (+5V)......................................................................................................................................................15
Synchronizing multiple units............................................................................................................................16
Mechanical drawings........................................................................................................................................17
Chapter 4
Specifications......................................................................................................................................18
Analog voltage output ......................................................................................................................................18
Analog output calibration.................................................................................................................................19
Digital input/output ..........................................................................................................................................20
Synchronous DAC Load...................................................................................................................................20
Counter.............................................................................................................................................................21
Memory ............................................................................................................................................................21
Microcontroller.................................................................................................................................................21
Power................................................................................................................................................................21

USB-3114 User's Guide
USB specifications ...........................................................................................................................................22
Environmental ..................................................................................................................................................22
Mechanical .......................................................................................................................................................22
Main connector and pin out..............................................................................................................................23
Declaration of Conformity..................................................................................................................24

6
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Measurement Computing USB-3114 data acquisition device and lists the
specifications.
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 a screen, such as buttons, text boxes, and check boxes.
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.

7
Chapter 1
Introducing the USB-3114
Overview: USB-3114 features
This user's guide contains all of the information you need to connect the USB-3114 to your computer and to the
signals you want to measure. The USB-3114 is part of the Measurement Computing brand of USB-based data
acquisition products.
The USB-3114 is a USB 2.0 full-speed, high-drive device that is supported under popular Microsoft®
Windows®operating systems. The USB-3114 is fully compatible with both USB 1.1 and USB 2.0 ports.
The USB-3114 provides 16 channels of high-drive analog voltage output, high output current, eight digital I/O
connections, and one 32-bit event counter.
Each of the voltage outputs of the USB-3114 incorporates high-drive current output capability. The high drive
current outputs allow each of the voltage outputs to sink/source up to 40 mA (maximum) of load current.
Caution! The USB-3114 voltage outputs should not be kept in a short-circuit condition for longer than the
specified 100 ms. For those applications that may potentially exceed the 40 mA maximum current
limit or the 100 ms short-circuit condition, external current limiting must be used to prevent
potential damage to the USB-3114.
The USB-3114 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 outputs may be updated individually or simultaneously.
The USB-3114 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. A bidirectional synchronization connection allows you to
simultaneously update the DAC outputs on multiple devices.
The USB-3114 is powered by a 5 volt, 2 amp AC power adapter that is shipped with the board. All I/O
connections are made to the screw terminals located along each side of the USB-3114.
Figure 1. USB-3114

USB-3114 User's Guide Introducing the USB-3114
8
USB-3114 block diagram
USB-3114 functions are illustrated in the block diagram shown here.
Figure 2. USB-3114 block diagram
Software features
For information on the features of InstaCal and the other software included with your USB-3114, refer to the
Quick Start Guide that shipped with your device.

9
Chapter 2
Installing the USB-3114
What comes with your USB-3114 shipment?
The following items are shipped with the USB-3114.
Hardware
USB-3114 device
USB cable (2 meter length)
External power supply and cord –10 watt AC power adapter. MCC part number PS-5V2AEPS.

USB-3114 User's Guide Installing the USB-3114
10
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/PDFs/manuals/DAQ-Software-Quick-Start.pdf. This booklet supplies a brief description
of the software you received with your USB-3114 and information regarding installation of that software.
Please read this booklet completely before installing any software or hardware.
Unpacking the USB-3114
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the USB-3114 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 any components are missing or damaged, notify Measurement Computing Corporation immediately by
phone, fax, or e-mail:
Phone: [phone] and follow the instructions for reaching Tech Support.
Fax: [phone] to the attention of Tech Support
Email: [email protected]
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/PDFs/manuals/DAQ-
Software-Quick-Start.pdf.
Installing the hardware
Be sure you are using the latest system software
Before you connect the USB-3114, make sure that you are using the latest versions of the USB drivers.
Before installing the USB-3114, 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 to
address 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-b7fe-
e85b688b7f86&displaylang=en. For more information, refer to the Microsoft Knowledge Base article
"Availability of the Windows XP SP1 USB 1.1and 2.0update." This article is available at
support.microsoft.com/?kbid=822603.
Connecting the AC power adapter
Power to the USB-3114 is provided with the 10 watt USB adapter (PS-5V2AEPS). To connect the power
supply to your USB-3114, connect the USB adapter cord to the power connector on the USB-3114 device, and
plug the AC adapter into a power outlet.
The power LED on the device lights up when the USB-3114 is receiving power from the AC power adapter.

USB-3114 User's Guide Installing the USB-3114
11
Connecting the USB-3114 to your system
To connect the USB-3114 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 power
and communication to the USB-3114.
When you connect the USB-3114 to a computer 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. After the
USB-3114 is installed, the USB LED should flash and then remain lit. This indicates that communication is
established between the USB-3114 and your computer.
Caution! Do not disconnect any device from the USB bus while the computer is communicating with the
USB-3114, or you may lose data and/or your ability to communicate with the USB-3114.
If the USB LED turns off
If the USB LED is illuminated but then turns off, the computer has lost communication with the USB-3114. To
restore communication, disconnect the USB cable from the computer, and then reconnect it. This should restore
communication, and the LED should turn back on.
Calibrating the USB-3114
The USB-3114 is shipped fully calibrated. Calibration coefficients are stored in the device FLASH memory.
Return the device to Measurement Computing Corporation when calibration is required. The normal calibration
interval is once per year.

12
Chapter 3
Functional Details
External components
The USB-3114 has the following external components, as shown in Figure 3.
USB connector
USB LED
Power connector
Power LED
Screw terminal banks (2)
Figure 3. USB-3114 external components
USB connector
The USB connector provides communication. Use the external power supply that shipped with the USB-3114
to power the device.
USB LED
The USB LED indicates the communication status of the USB-3114. It uses up to 10 mA of current and cannot
be disabled. The table below defines the function of the USB LED.
LED Illumination
LED Illumination
Indication
Steady green
The USB-3114 is connected to a computer or external USB hub.
Blinks continuously
Data is being transferred.
Power connector
Connect the external power adapter (MCC part number PS-5V2AEPS) to this connector.

USB-3114 User's Guide Functional Details
13
Power LED
The power LED lights up when the USB-3114 is receiving power from the AC power adapter.
Screw terminal banks
The USB-3114 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-3114 screw terminal pin numbering
Screw terminal –pins 1-28
The screw terminals on the bottom edge of the USB-3114 (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-3114 (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)

USB-3114 User's Guide Functional Details
14
Figure 5. USB-3114 signal pin out
Analog voltage output terminals (VOUT0 to VOUT15)
The screw terminal pins labeled VOUT0 to VOUT15 are voltage output terminals (see Figure 5). The voltage
output range for each channel is software-programmable for either bipolar or unipolar. The bipolar range is
±10 V, and the unipolar range is 0 to 10 V. The channel outputs may be updated individually or simultaneously.
Digital I/O terminals (DIO0 to DIO7)
You can connect up to eight digital I/O lines to the screw terminals labeled DIO0 to DIO7 (pins 21 through 28).
You can configure each digital port for either input or output.
When you configure the digital bits for input, you can use the digital I/O terminals to detect the state of any
TTL level input. Refer to the switch shown in Figure 6 and the schematic shown in Figure 7. When the switch
is set to the +5 V USER input, DIO7 reads TRUE (1). If you move the switch to DGND, DIO7 reads
FALSE (0).
Figure 6. DIO7 detecting the state of a switch
Figure 7. Schematic showing DIO7 detecting the state of a switch
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/pdfs/DAQ-Signal-Connections.pdf).

USB-3114 User's Guide Functional Details
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Digital I/O control terminal (DIO CTL) for pull-up/down configuration
All digital pins are floating by default. When inputs are floating, the state of unwired inputs are undefined (they
may read high or low). You can configure the inputs to read a high or low value when they aren’t wired. Use
the DIO CTL connection (pin 54) to configure the digital pins for pull-up (inputs read high when unwired) or
pull-down (inputs read low when unwired).
To pull up the digital pins to +5V, wire the DIO CTL terminal pin to the +5V terminal pin (pin 56).
To pull down the digital pins to ground (0 volts), wire the DIO CTL terminal pin to a DGND terminal pin
(pin 50, 53, or 55).
Ground terminals (AGND, DGND)
Eight analog ground (AGND) connections provide a common ground for all analog voltage output channels.
Three digital ground (DGND) connections provide a common ground for the DIO, CTR, SYNCLD and +5V
connections.
Synchronous DAC load terminal (SYNCLD)
The synchronous DAC load connection (pin 49) is a bidirectional I/O signal that allows you to simultaneously
update the DAC outputs on multiple devices. You can use this pin for two purposes:
Configure as an input (slave mode) to receive the D/A LOAD signal from an external source.
When the SYNCLD pin receives the trigger signal, the analog outputs are updated simultaneously.
SYNCLD pin must be logic low in slave mode for immediate update of DAC outputs
When the SYNCLD pin is in slave mode, the analog outputs can be updated immediately or when a positive
edge is seen on the SYNCLD pin (this is under software control.)
The SYNCLD pin must be at a low logic level for DAC outputs to update immediately. If the external source
supplying the D/A LOAD signal is pulling the SYNCLD pin high, no update will occur.
Refer to the "USB-3100 Series" section in the Universal Library User's Guide for information on how to
update DAC outputs immediately.
Configure as an output (master mode) to send the internal D/A LOAD signal to the SYNCLD pin.
You can use the SYNCLD pin to synchronize with a second USB-3114 and simultaneously update the
DAC outputs on each device. Refer to Synchronizing multiple units section on page 16.
Use InstaCal to configure the SYNCLD mode as master or slave. On power up and reset the SYNCLD pin is
set to slave mode (input).
Refer to the "USB-3100 Series" section in the Universal Library User's Guide for information on how to
configure the USB-3114 with the Universal Library.
Counter terminal (CTR)
The CTR connection (pin 52) is the input to the 32-bit event counter. The internal counter increments when the
TTL levels transition from low to high. The counter can count frequencies of up to 1 MHz.
Power terminal (+5V)
The +5 V connection (pin 56) draws power from the external power connector. This terminal is a +5V output.
Caution! The +5V terminal is an output. Do not connect to an external power supply or you may damage
the USB-3114 and possibly the computer.

USB-3114 User's Guide Functional Details
16
Synchronizing multiple units
You can connect the SYNCLD terminal pin (pin 49) of two USB-3114 units together in a master/slave
configuration and simultaneously update the DAC outputs of both devices. Do the following.
1. Connect the SYNCLD pin of the master USB-3114 to the SYNCLD pin of the slave USB-3114.
2. Configure the SYNCLD pin on the slave device for input to receive the D/A LOAD signal from the master
device. Use InstaCal to set the direction of the SYNCLD pin.
3. Configure the SYNCLD pin on the master device for output to generate an output pulse on the SYNCLD
pin.
Set the Universal Library SIMULTANEOUS option for each device. Refer to the Universal Library User's Guide
for information on how to configure the USB-3114 with the Universal Library.
When the SYNCLD pin on the slave device receives the signal, the analog output channels on each device are
updated simultaneously.
An example of a master/slave configuration is shown here.
Figure 8. Synchronizing the update of multiple units

USB-3114 User's Guide Functional Details
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Mechanical drawings
Figure 9. Circuit board (top) and housing dimensions

18
Chapter 4
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog voltage output
Table 1. Analog voltage output specifications
Parameter
Conditions
Specifications
Digital to Analog converter
DAC8554
Number of channels
16
Resolution
16 bits
Output ranges
Calibrated
±10 V, 0 to 10 V
Software configurable
Un-calibrated
±10.2 V, -0.04 to 10.08 V
Software configurable
Output Transient
±10 V to (0 to 10 V) or
(0 to 10 V) to ±10 V range
selection (Note 1)
Duration 5 µS typ.
Amplitude 5 V p-p typ
Host PC is reset, powered up,
suspended or a reset command is
issued to device. (Note 2)
Duration 2 S typ.
Amplitude 2 V p-p typ
Initial power on.
Duration 50 mS typ.
Amplitude 5 V peak typ
Differential non-linearity
(Note 3)
Calibrated
±1.25 LSB typ.
-2 LSB to +1 LSB max.
Un-calibrated
±0.25 LSB typ.
±1 LSB max
Output current
(Note 4)
VOUTx pins
±40 mA max.: single channel
±180mA max.: total load current
Output short-circuit protection
(Note 4)
VOUTx connected to AGND
100 mS max.
Output coupling
DC
Power on and reset state
DACs clear to zero-scale: 0 V, ±50 mV typ.
Output range: 0-10V
Output noise
0 to 10 V range
14.95 µVrms typ.
±10 V range
31.67 µVrms typ.
Settling time
to 1 LSB accuracy
25 µS typ.
Slew rate
0 to10 V range
2.0 V/µS typ.
±10 V range
4.0 V/µS typ.
Throughput
single channel
100 Hz max., system dependent
multi-channel
100 Hz/#ch max., system dependent
Note 1: The USB-3114 output voltage level defaults to 0V whenever the output voltage range is
reconfigured.
The USB-3114 output voltage level will also default to 0V:
1) Whenever the host PC is reset, shut down or suspended
2) If a reset command is issued to the device.

USB-3114 User's Guide Specifications
19
Note 2: The duration of this particular output transient is highly dependent on the enumeration process of
the host PC. Typically the output of the USB-3114 is stable after 2 seconds.
Note 3: The maximum differential non-linearity specification applies to the entire 0 to 50 °C temperature
range of the USB-3114. This specification also accounts for the maximum errors due to the
software calibration algorithm (in Calibrated mode only) and the DAC8554 digital to analog
converter non-linearities.
Note 4: The USB-3114 voltage outputs should not be kept in a short-circuit condition for longer than the
specified limit of 100 ms. For those applications that may potentially exceed the 40 mA
maximum current limit or the 100 ms short-circuit condition, external current limiting must be
used to prevent potential damage to the USB-3114.
Table 2. Absolute accuracy specifications –calibrated output, VOUTx Rload = 20 mA fixed resistive load
Range
Accuracy (±LSB)
±10 V
14.0
0 to 10 V
22.0
Table 3. Absolute accuracy components specifications –calibrated output
Range
% of reading
Offset (±mV)
Temp drift (%/°C)
Absolute accuracy at FS (±mV)
±10 V
±0.0183
1.831
0.00055
3.661
0 to 10 V
±0.0183
0.915
0.00055
2.746
Table 4. Relative accuracy specifications
Range
Relative accuracy (±LSB)
±10 V , 0 to 10 V
4.0 typ.
12.0 max.
Analog output calibration
Table 5. Analog output calibration specifications
Parameter
Conditions
Specifications
Recommended warm-up time
15 minutes min.
On-board precision reference
DC level: 5.000 V ±1 mV max.
Tempco: ±10 ppm/°C max.
Long term stability: ±10 ppm/SQRT(1000 hrs)
Calibration method
Voutx Rload = 20 mA fixed
resistive load
Software calibration
Calibration interval
1 year

USB-3114 User's Guide Specifications
20
Digital input/output
Table 6. Digital I/O specifications
Digital logic type
CMOS
Number of I/O
8
Configuration
Independently configured for input or output
Pull-up/pull-down configuration
(Note 5)
User configurable
All pins floating (default)
Digital I/O input loading
TTL (default)
47 K ohms (pull-up/pull down configurations)
Digital I/O transfer rate (system paced)
System dependent, 33 to 1000 port reads/writes or single bit reads/writes per
second.
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)
3.8 V min
Output low voltage (IOL = 2.5 mA)
0.7 V max
Power on and reset state
Input
Note 5: Pull up and pull down configuration area available using the DIO CTL terminal block pin 54.
The pull down configuration requires the DIO CTL pin (pin 54) to be connected to a DGND pin
(pin 50, 53 or 55). For a pull up configuration, the DIO CTL pin should be connected to the +5V
terminal pin (pin 56).
Synchronous DAC Load
Table 7. SYNCLD I/O specifications
Parameter
Conditions
Specification
Pin name
SYNCLD (terminal block pin 49)
Power on and reset state
Input
Pin type
Bidirectional
Termination
Internal 100K ohms pull-down
Software selectable direction
Output
Outputs internal D/A LOAD signal.
Input
Receives D/A LOAD signal from external source.
Input clock rate
100 Hz max
Clock pulse width
Input
1 µs min
Output
5 µs min
Input leakage current
±1.0 µA typ.
Input high voltage
4.0 V min, 5.5 V absolute max
Input low voltage
1.0 V max, –0.5 V absolute min
Output high voltage (Note 6)
IOH = –2.5 mA
3.3 V min
No load
3.8 V min
Output low voltage (Note 6)
IOL = 2.5 mA
1.1 V max
No load
0.6 V max
Note 6: SYNCLD is a Schmitt trigger input and is over-current protected with a 200 Ohm series resistor.
Note 7: When SYNCLD is in input mode, the analog outputs may either be updated immediately or when
a positive edge is seen on the SYNCLD pin (this is under software control.) However, the pin
must be at a low logic level in order for the DAC outputs to be updated immediately. If an
external source is pulling the pin high, no update will occur.