Measurement Computing USB-1208HS-2AO Manual de usuario

USB-1208HS-2AO

High-Speed Analog Input and Digital I/O

Document Revision 4

July 2014

User's Guide

HM USB-1208HS-2AO.docx

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Table of Contents

Preface

About this Manual.................................................................................................................................5

Conventions........................................................................................................................................................5

Where to find more information.........................................................................................................................5

Chapter 1

Introducing the USB-1208HS-2AO ......................................................................................................6

Functional block diagram...................................................................................................................................6

Chapter 2

Installing the USB-1208HS-2AO ..........................................................................................................7

What comes with your shipment?.......................................................................................................................7

Hardware .......................................................................................................................................................................... 7

Software............................................................................................................................................................................ 7

Documentation.................................................................................................................................................................. 7

Unpacking...........................................................................................................................................................7

Installing the software ........................................................................................................................................7

Installing the hardware .......................................................................................................................................7

Calibrating the USB-1208HS-2AO ....................................................................................................................8

Chapter 3

Functional Details .................................................................................................................................9

Analog input acquisition modes .........................................................................................................................9

Software paced mode........................................................................................................................................................ 9

Hardware paced mode....................................................................................................................................................... 9

External components ..........................................................................................................................................9

Screw terminals................................................................................................................................................................10

USB connector.................................................................................................................................................................11

Activity LED ...................................................................................................................................................................11

Status LED.......................................................................................................................................................................11

Signal connections............................................................................................................................................11

Analog input....................................................................................................................................................................11

Analog output ..................................................................................................................................................................12

External clock I/O............................................................................................................................................................12

Digital I/O........................................................................................................................................................................13

Counter input...................................................................................................................................................................14

Timer output....................................................................................................................................................................14

Trigger input....................................................................................................................................................................15

Power output....................................................................................................................................................................15

Ground.............................................................................................................................................................................15

Chapter 4

Specifications......................................................................................................................................16

Analog input.....................................................................................................................................................16

Analog output ...................................................................................................................................................18

Digital input/output...........................................................................................................................................18

External trigger.................................................................................................................................................19

External clock input/output...............................................................................................................................19

Counters............................................................................................................................................................20

Timer ................................................................................................................................................................20

Memory ............................................................................................................................................................20

Power................................................................................................................................................................21

USB specifications ...........................................................................................................................................21

USB-1208HS-2AO User's Guide

Environmental ..................................................................................................................................................21

Mechanical .......................................................................................................................................................22

Screw terminal connector and pinout ...............................................................................................................22

Declaration of Conformity..................................................................................................................24

Preface

About this Manual

This document describes the USB-1208HS-2AO data acquisition device and lists device specifications.

Conventions

For more information

Text presented in a box signifies additional information related to the subject matter.

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

Additional information about USB-1208HS-2AO hardware is available on our website at www.mccdaq.com.

You can also contact Measurement Computing Corporation by phone, fax, or email with specific questions.

Knowledgebase: kb.mccdaq.com

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

Chapter 1

Introducing the USB-1208HS-2AO

The USB-1208HS-2AO is a high-speed analog input and digital I/O data acquisition device providing the

following features:

Eight 13-bit single-ended (SE) or four differential (DIFF) analog inputs

Two 12-bit analog outputs

One external clock input and one external output for analog inputs

One external clock input and one external output for analog outputs

One digital trigger input

16 individually configurable digital I/O channels

Two 32-bit counter inputs

One 32-bit timer output

Screw terminals for field wiring connections

The device is powered by the +5 volt USB supply from your computer, and requires no external power.

The USB-1208HS-2AO is a USB 2.0 high-speed device supported under popular Microsoft®Windows®

operating systems. The USB-1208HS-2AO is compatible with both USB 1.1 and USB 2.0 ports (although the

speed of the module maybe limited when using USB 1.1 ports).

Functional block diagram

USB-1208HS-2AO functions are illustrated in Figure 1.

Figure 1. USB-1208HS-2AO functional block diagram

Chapter 2

Installing the USB-1208HS-2AO

What comes with your shipment?

The following items are shipped with the USB-1208HS-2AO:

Hardware

USB-1208HS-2AO

USB cable

Software

MCC DAQ CD

Documentation

In addition to this hardware user's guide, you should also receive the Quick Start Guide. This booklet provides

an overview of the MCC DAQ software you received with the device, and includes information about installing

the software. Please read this booklet completely before installing any software or hardware.

Unpacking

As with any electronic device, take care while handling to avoid damage from static electricity. Before

removing the USB-1208HS-2AO from its packaging, ground yourself using a wrist strap or touch either the

computer chassis or other grounded object to eliminate any stored static charge. If the device is damaged, notify

Measurement Computing Corporation immediately by phone, fax, or email.

Knowledgebase: kb.mccdaq.com

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

For international customers, contact your local distributor. Refer to the International Distributors section on our

web site at www.mccdaq.com/International.

Installing the software

Refer to the Quick Start Guide for instructions on installing the software on the MCC DAQ CD. This booklet is

available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.

Installing the hardware

Be sure you are using the latest system software

Before you install the device, run Windows Update to update your operating system with the latest USB drivers.

Install the MCC DAQ software before you install your board

The driver needed to run your board is installed with the MCC DAQ software. Therefore, you need to install the

software before you install your board. Refer to the Quick Start Guide for instructions.

To connect the USB-1208HS-2AO 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 connected to your computer. The USB cable provides power

and communication to the USB-1208HS-2AO.

When you connect the USB-1208HS-2AO for the first time, a Found New Hardware dialog opens when the

operating system detects the device. The Status LED turns on; this indicates that communication is established

between the device and the computer. Refer to Figure 2 on page 9 for the location of the Status LED. When the

dialog closes, the installation is complete.

USB-1208HS-2AO User's Guide Installing the USB-1208HS-2AO

Caution! Do not disconnect any device from the USB bus while the computer is communicating with the

device, or you may lose data and/or your ability to communicate with the USB-1208HS-2AO.

If the Status LED turns off

The Status LED turns off if communication is lost between the device and the computer. To restore

communication, disconnect the USB cable from the computer and reconnect it. The Status LED should turn on.

Calibrating the USB-1208HS-2AO

The USB-1208HS-2AO is shipped fully calibrated. Calibration coefficients are stored in EEPROM.

Return the device to Measurement Computing Corporation when calibration is required. The normal calibration

interval is once per year.

Chapter 3

Functional Details

Analog input acquisition modes

The USB-1208HS-2AO can acquire analog input data in two basic 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 by

calling a software command. The analog value is converted to digital data and returned to the computer. You

can repeat this procedure until you have the total number of samples that you want.

The throughput sample rate in software paced mode is system-dependent, and can range from 33 S/s to

4000 S/s.

Hardware paced mode

You can acquire data from up to eight channels in hardware-paced mode. The analog data is continuously

acquired, converted to digital values, and written to an onboard FIFO buffer on the USB-1208HS-2AO until

you stop the scan. The FIFO buffer is serviced in blocks as the data is transferred from the USB-1208HS-2AO

FIFO buffer to the memory buffer on your computer.

The maximum sample rate is 1 MS/s aggregate over one-to-eight channels. You can start a continuous scan with

either a software command or with an external hardware trigger event.

External components

The USB-1208HS-2AO has the following external components, as shown in Figure 2.

Screw terminal banks

LED indicators

USB connector

1 Screw terminal pins 1 to 28 4 Activity LED

2 Screw terminal pins 29 to 56 5 USB connector

3 Status LED

Figure 2. External components

USB-1208HS-2AO User's Guide Functional Details

Screw terminals

The differential mode pinout is shown in Figure 3.

Figure 3. Differential mode pinout

The single-ended mode pinout is shown in Figure 4.

Figure 4. Single-ended mode pinout

Use 16 AWG to 30 AWG for signal connections.

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