Related Manuals for Measurement Computing USB-231-OEM
Summary of Contents for Measurement Computing USB-231-OEM
- Page 1 USB-231-OEM Analog and Digital I/O User's Guide January 2019. Rev 4 © Measurement Computing Corporation...
- Page 2 Other product and company names mentioned herein are trademarks or trade names of their respective companies. © 2019 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.
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Page 3: Table Of Contents
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-231-OEM ......................6 Functional block diagram ........................... 7 Chapter 2 Installing the USB-231-OEM ......................... 8 Unpacking................................ - Page 4 USB-231-OEM User's Guide Power output ..............................23 USB specifications ............................23 Environmental ..............................24 Mechanical ............................... 24 Header connectors ............................24 Differential mode pinout ..............................24 Single-ended mode pinout ...............................25...
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Page 5: Preface
Preface About this User's Guide What you will learn from this user's guide This user's guide describes the Measurement Computing USB-231-OEM data acquisition device and lists device specifications. Conventions in this user's guide For more information Text presented in a box signifies additional information related to the subject matter. -
Page 6: Introducing The Usb-231-Oem
One 34-pin header connector for field wiring connections The USB-231-OEM is a USB 2.0 high speed device that is compatible with USB 3.0 ports. The device is also compatible with USB 1.1 ports, but use with this older hardware is not recommended due to longer initialization times that can occur when the USB-231-OEM is connected through USB 1.1 ports or hubs. -
Page 7: Functional Block Diagram
USB-231-OEM User's Guide Introducing the USB-231-OEM Functional block diagram Device functions are illustrated in the block diagram shown here. Figure 1. USB-231-OEM functional block diagram... -
Page 8: Installing The Usb-231-Oem
Installing the hardware Installing on a Windows platform Connect the USB-231-OEM to a to an available USB port on the computer running Windows. Connect the other end of the cable to the micro-USB connector on the device. No external power is required. -
Page 9: Functional Details
Functional Details Analog input acquisition modes The USB-231-OEM can acquire analog input data in two different modes – software paced and hardware paced. Software paced mode You can acquire one analog sample at a time in software paced mode. You initiate the A/D conversion with a software command. -
Page 10: Board Components
USB-231-OEM User's Guide Functional Details Board components Board components are shown in Figure 2. Micro-USB connector 34-pin header connector (J2) Figure 2. Board components USB connector The Micro-USB connector provides +5 V power and communication. No external power supply is required. -
Page 11: Signal Connections
You can connect up to eight single-ended inputs or up to four differential inputs to connectors CH0H/CH0L through . The input voltage range is ±10 V. Figure 3 shows the USB-231-OEM analog input CH3H/CH3L circuitry. Figure 3. USB-231-OEM analog input circuitry The main analog input circuitry blocks are as follows: —The multiplexer (MUX) routes one AI channel at a time to the mode selector multiplexer... - Page 12 Input range The USB-231-OEM has an input range of ±10 V. For DIFF mode, each AI should stay within ±10 V with respect to AGND, and the voltage between positive and negative inputs should be lower or equal to ±10 V. For SE mode, signals of ±10 V at any analog input connector with respect to AGND are accurately measured.
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Page 13: Analog Output
USB-231-OEM User's Guide Functional Details Multichannel scanning The USB-231-OEM can scan multiple channels at high rates and digitize the signals accurately. However, you should consider several issues when designing your measurement system to ensure the high accuracy of your measurements: To ensure fast settling times, your signal sources should have an ... - Page 14 Generating analog output data The USB-231-OEM can generate analog output data in two different modes – software paced and hardware paced. – Software controls the rate at which data is generated. Software sends a separate ...
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Page 15: Digital I/O
Power-on states At system startup and reset, the USB-231-OEM sets all DIO lines to high-impedance inputs. The device does not drive the signal high or low. Each line has a weak pull-down resistor connected to it. -
Page 16: Trigger Input
Counting down is not supported – you cannot set the initial count to 100 and count down to 99, 98, 97. USB signals, power (D–, D+, VBUS) When using a USB connector on your motherboard to connect the USB-231-OEM to the USB host through the 34-pin connector, do not connect to the USB connector. -
Page 17: Vo Power Source
The +5 V load should be connected between connector and . The current delivered by the USB-231-OEM at the connector is sourced from the USB connector. To meet the USB specifications, a maximum of 150 mA can be used from the... -
Page 18: Ground
USB-231-OEM User's Guide Functional Details Figure 11. Connecting the +VO power source load The + 5 V power is always enabled and the voltage is present at the connector when the device is in active mode. The +5 V power source is not available for about one second after the device is first connected to the USB connector or when the device is in suspend mode. -
Page 19: Mechanical Drawings
USB-231-OEM User's Guide Functional Details Mechanical drawings Figure 12. Circuit board dimensions... -
Page 20: Specifications
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 input Table 1. Analog input specifications Parameter Condition Specification A/D converter type Successive approximation ADC resolution 16 bits Sampling rate... -
Page 21: Analog Output
USB-231-OEM User's Guide Specifications Analog output Table 3. Analog output specifications Parameter Condition Specification Resolution 16 bits, 1 in 65,536 Output range ±10 V Number of channels Update rate Hardware paced 5 kS/s simultaneous per channel max, hardware-paced Trigger sources... -
Page 22: Digital Input
USB-231-OEM User's Guide Specifications Digital input Table 5. Digital input specifications Parameter Condition Specification Input voltage range Power on 0 V to 5 V Power off 0 V to 3.3 V (Note 1) Input voltage protection ±20 V on two lines per port (maximum of five... -
Page 23: Led Electrical Characteristics
Maximum load USB current <500 mA (Note 3) Note 2: A typical bus-powered hub provides 100 mA on its USB lines. The USB-231-OEM does not work on a bus- powered hub. Note 3: The maximum power draw from all output terminals should be kept under 0.9 W to avoid overloading the USB... -
Page 24: Environmental
USB-231-OEM User's Guide Specifications Environmental Table 13. Environmental specifications (Indoor use only) Parameter Specification Operating temperature range 0 °C to 45 C Storage temperature range –40 °C to 85 °C Operating humidity range 5% to 95% RH, non-condensing Storage humidity range... -
Page 25: Single-Ended Mode Pinout
USB-231-OEM User's Guide Specifications Single-ended mode pinout Do not connect to connector pins labeled NC. Table 17. J2 single-ended pinout Signal name Pin description Signal name Pin description AOUT0 Analog output 0 AOUT1 Analog output 1 AGND Analog ground AGND... - Page 26 Measurement Computing Corporation NI Hungary Kft 10 Commerce Way H-4031 Debrecen, Hátar út 1/A, Hungary Norton, Massachusetts 02766 Phone: +36 (52) 515400 (508) 946-5100 Fax: +36 (52) 515414 Fax: (508) 946-9500 http://hungary.ni.com/debrecen E-mail: info@mccdaq.com www.mccdaq.com...
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