Logicbus 3101 USB Based Analog Output User Guide

USB-3101
USB-based Analog Output
User’s Guide

November 2017. Rev 4
© Measurement Computing Corporation

3101 USB Based Analog Output

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.

Preface

About this User’s Guide

What you will learn from this user’s guide
This user’s guide describes the Measurement Computing USB-3101 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-3101 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: techsupport@mccdaq.com
• Phone: 508-946-5100 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.

Chapter 1 Introducing the USB-3101

Overview: USB-3101 features
This user’s guide contains all of the information you need to connect the USB-3101 to your computer and to the signals you want to control. The USB-3101 is part of the Measurement Computing brand of USB-based data acquisition products.
The USB-3101 is a USB 2.0 full-speed device that is supported under popular Microsoft operating systems. The USB-3101 is fully compatible with both USB 1.1 and USB 2.0 ports. Windows® The USB-3101 provides four channels of analog voltage output, eight digital I/O connections, and  one 32-bit event counter.
The USB-3101 has a quad (4-channel) 16-bit digital-to-analog converter (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-3101 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-3101 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-3101.

USB-3101 block diagram
USB-3101 functions are illustrated in the block diagram shown here.

Chapter 2 Installing the USB-3101

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-3101 product page on our website for information about the software supported by the USB-3101.
Install the software before you install your device
The driver needed to run the USB-3101 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-3101 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-3101 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.

Chapter 3 Functional Details

External components
The USB-3101 has the following external components, as shown in Figure 3.

• USB connector
• Status LED
• Power LED
• Screw terminal banks (2)

USB connector
The USB connector provides power and communication to the USB-3101. 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-3101. It flashes when data is being transferred, and is off when the USB-3101 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-3101 is connected to a USB port on your computer or to an external USB hub that is connected to your computer.

Screw terminal banks
The USB-3101 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.

Screw terminal – pins 1-28
The screw terminals on the bottom edge of the USB-3101 (pins 1 to 28) provide the following connections:

• Two analog voltage output connections (VOUT0, VOUT2)
• 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-3101 (pins 29 to 56) provide the following connections:

• Two analog voltage output connections (VOUT1, VOUT3)
• 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 (+5 V)

Analog voltage output terminals (VOUT0 to VOUT3)
The screw terminal pins labeled VOUT0 to VOUT3 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 bit 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 Figure 6. 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).

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 website at www.mccdaq.com/support/DAQ-Signal- Connections.aspx)).

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 pulldown (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 Help 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-3101 and simultaneously update the DAC outputs on each device. Refer to Synchronizing multiple units section on page 12.

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).

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 USB 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-3101 and possibly the computer.

Synchronizing multiple units
You can connect the SYNCLD terminal pin (pin 49) of two USB-3101 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-3101 to the SYNCLD pin of the slave USB-3101.
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.
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.

Chapter 4 Specifications

All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog voltage output

Table 1. Analog voltage output specifications

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: 5V p-p typ
Host PC is reset, powered on, suspended or a  reset command is issued to device.
(Note 2)| Duration: 2 S typ
Amplitude: 2V p-p typ
Initial power on| Duration: 50 mS typ
Amplitude: 5V 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| VOUTx pins| ±3.5 mA typ
Output short-circuit protection| VOUTx connected to AGND| Indefinite
Output coupling| | DC
Power on and reset state| | DACs cleared 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 to 10 V range| 1.20 V/µS typ
±10 V range| 1.20 V/µS typ
Throughput| Single-channel| 100 Hz max, system dependent
Multi-channel| 100 Hz/#ch max, system dependent

Note 3: The maximum differential non-linearity specification applies to the entire 0 to 70 °C temperature range of the USB-3101. 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.

Table 2. Absolute accuracy specifications – calibrated output

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

Analog output calibration
Table 5. Analog output calibration specifications

Tempco: ±10 ppm/°C max
Long term stability: ±10 ppm/SQRT(1000 hrs)
Calibration method| Software calibration
Calibration interval| 1 year

Digital input/output

Table 6. Digital I/O specifications

Pull-up/pull-down configuration

(Note 4)

| User configurable
All pins floating (default)
Digital I/O input loading| TTL (default)
47 kL (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 4: 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

Note 5: SYNCLD is a Schmitt trigger input and is over-current protected with a 200 Ohm series resistor.
Note 6: 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 for the DAC outputs to be updated immediately. If an external  source is pulling the pin high, no update will occur.

Counter

Table 8. CTR I/O specifications

to 1000 reads per second.
Counter write| System dependent, 33 to 1000 reads per second.
Schmidt trigger hysteresis| | 20 mV to 100 mV
Input leakage current| | ±1.0 µA typ
Input frequency| | 1 MHz max
High pulse width| | 500 nS min
Low pulse width| | 500 ns min
Input high voltage| | 4.0 V min, 5.5 V absolute max
Input low voltage| | 1.0 V max, –0.5 V absolute min

Memory

Table 9. Memory specifications

Microcontroller

Table 10. Microcontroller specifications

Power

Table 11. Power specifications

4.5 V min, 5.25 V max
+5V user output current (Note 9)| Available at terminal block pin 56| 10 mA max

Note 7: This is the total quiescent current requirement for the USB-3101 which includes up to 10 mA for the status LED. This does not include any potential loading of the digital I/O bits, +5V user terminal, or the VOUTx outputs.
Note 8: Output voltage range assumes USB power supply is within specified limits.
Note 9: This refers to the total amount of current that can be sourced from the +5V user terminal (pin 56) for general use. This specification also includes any additional contribution due to DIO loading.

USB specifications
Table 12. USB specifications

VBUS/GND, min 28 AWG D+/D–)

Environmental
Table 13. Environmental specifications

Mechanical
Table 14. Mechanical specifications

Screw terminal connector
Table 15. Main connector specifications

EU Declaration of Conformity

According to ISO/IEC 17050-1:2010

Manufacturer: Measurement Computing Corporation

Address:
10 Commerce Way
Norton, MA 02766
USA

Product Category: Electrical equipment for measurement, control and laboratory use.
Date and Place of Issue : October 10, 2017, Norton, Massachusetts USA
Test Report Number: EMI4712.07/EMI5193.08

Measurement Computing Corporation declares under sole responsibility that the product
USB-3101

is in conformity with the relevant Union Harmonization Legislation and complies with the essential requirements of the following applicable European Directives:
Electromagnetic Compatibility (EMC) Directive 2014/30/EU
Low Voltage Directive 2014/35/EU
RoHS Directive 2011/65/EU

Conformity is assessed in accordance to the following standards:
EMC:

Emissions:

• EN 61326-1:2013 (IEC 61326-1:2012), Class A
• EN 55011: 2009 + A1:2010 (IEC CISPR 11:2009 + A1:2010), Group 1, Class A

Immunity:

• EN 61326-1:2013 (IEC 61326-1:2012), Controlled EM Environments
• EN 61000-4-2:2008 (IEC 61000-4-2:2008)
• EN 61000-4-3 :2010 (IEC61000-4-3:2010)

Safety:

• EN 61010-1 (IEC 61010-1)

Environmental Affairs:
Articles manufactured on or after the Date of Issue of this Declaration of Conformity do not contain any of the restricted substances in concentrations/applications not permitted by the RoHS Directive.

Carl Haapaoja, Director of Quality Assurance

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

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Phone: +36 (52) 515400
Fax: +36 (52) 515414
http://hungary.ni.com/debrecen

sales@logicbus.com
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www.logicbus.com

References

• Test and Measurement Systems, a part of Emerson - NI
• MCC DAQ - About
• MCC DAQ - About
• MCC DAQ - About
• Support - Digilent
• Support - Digilent

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