Measurement USB-1608FS-Plus User Manual
USB-1208LS
Document Revision 3
March 2013
© Copyright 2013
User's Guide
Analog and Digital I/O
HM USB-1208LS.docx
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Table of Contents
Preface
About this User's Guide ....................................................................................................................... 5
Conventions in this user's guide ......................................................................................................................... 5
Where to find more information ......................................................................................................................... 5
Chapter 1
Introducing the USB-1208LS................................................................................................................ 6
Functional block diagram ................................................................................................................................... 6
Connecting a USB-1208LS to your computer is easy ........................................................................................ 7
Chapter 2
Installing the USB-1208LS.................................................................................................................... 8
What comes with your shipment? ....................................................................................................................... 8
Hardware .......................................................................................................................................................................... 8
Documentation ................................ ................................................................ ................................................................ .. 8
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8
Chapter 3
Functional Details ................................................................................................................................. 9
Analog input acquisition modes ......................................................................................................................... 9
Software paced mode ........................................................................................................................................................ 9
Hardware paced mode....................................................................................................................................................... 9
Burst scan mode ................................................................................................................................................................ 9
External components .......................................................................................................................................... 9
USB connector .................................................................................................................................................................10
LED .................................................................................................................................................................................10
Screw terminal wiring ......................................................................................................................................................10
Signal connections ............................................................................................................................................ 11
Analog inputs ...................................................................................................................................................................11
Digital I/O ........................................................................................................................................................................13
Trigger input ....................................................................................................................................................................14
Counter input ...................................................................................................................................................................14
Calibration output ............................................................................................................................................................14
Power output ....................................................................................................................................................................14
Ground terminals .............................................................................................................................................................14
Accuracy ........................................................................................................................................................... 15
Mechanical drawings ................................................................................................................................ ........ 18
Chapter 4
Specifications ...................................................................................................................................... 19
Analog input ..................................................................................................................................................... 19
Analog output ................................................................................................................................................... 20
Digital input/output........................................................................................................................................... 21
External trigger ................................................................................................................................................. 21
Counter ............................................................................................................................................................. 21
Non-volatile memory ........................................................................................................................................ 22
Power ................................................................................................................................................................ 22
General ............................................................................................................................................................. 22
Environmental .................................................................................................................................................. 22
Mechanical ....................................................................................................................................................... 23
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USB-1208LS User's Guide
Signal connector ............................................................................................................................................... 23
Declaration of Conformity .................................................................................................................. 25
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Preface
About this User's Guide
This user's guide describes the Measurement Computing USB-1208LS 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.
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-1208LS hardware is available on our website at www.mccdaq.com. You can
also contact Measurement Computing Corporation 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
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Chapter 1
Introducing the USB-1208LS
The USB-1208LS is a USB 1.1 low-speed device supported under popular Microsoft® Windows® operating
systems. It is designed for USB 1.1 ports, and tested for compatibility with both USB 1.1 and USB 2.0 ports.
The USB-1208LS features eight analog inputs, two 10-bit analog outputs, 16 digital I/O connections, and one
32-bit external event counter.
The analog inputs are software configurable for either eight 11-bit single-ended inputs, or four 12-bit
differential inputs. An on-board industry standard 82C55 programmable peripheral interface chip provides the
16 digital I/O lines in two 8-bit ports. You can configure each port independently for either input or output.
The USB-1208LS is powered by the +5 volt USB supply from your computer; no external power is required.
I/O connections are made to the device screw terminals.
Functional block diagram
USB-1208LS functions are illustrated in the block diagram shown here.
Figure 1. Functional block diagram
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USB-1208LS User's Guide Introducing the USB-1208LS
Connecting a USB-1208LS to your computer is easy
Installing a data acquisition device has never been easier.
The USB-1208LS relies upon the Microsoft Human Interface Device (HID) class drivers. The HID class
drivers ship with every copy of Windows that is designed to work with USB ports. We use the Microsoft
HID because it is a standard, and its performance delivers full control and maximizes data transfer rates for
your USB-1208LS. No third-party device driver is required.
The USB-1208LS is plug-and-play. There are no jumpers to position, DIP switches to set, or interrupts to
configure.
You can connect the USB-1208LS before or after you install the software, and without powering down
your computer first. When you connect an HID to your system, your computer automatically detects it and
configures the necessary software. You can connect and power multiple HID peripherals to your system
using a USB hub.
You can connect your system to various devices using a standard four-wire cable. The USB connector
replaces the serial and parallel port connectors with one standardized plug and port combination.
You do not need a separate power supply module. The USB automatically delivers the electrical power
required by each peripheral connected to your system.
Data can flow two ways between a computer and peripheral over USB connections.
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Chapter 2
Installing the USB-1208LS
What comes with your shipment?
As you unpack your USB-1208LS, verify that the following components are included.
Hardware
The following items should be included with your shipment.
USB-1208LS
USB cable
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, you should take care while handling to avoid damage from static
electricity. Before removing the USB-1208LS 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, contact us immediately using one of the following methods:
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
website 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 installing the device, run Windows Update to update your system with the latest HID and USB drivers.
To connect the USB-1208LS 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 device. When you connect the USB-1208LS for the first time, a Found New
Hardware dialog opens when the operating system detects the device. Another dialog identifies the USB-
1208LS as a USB Human Interface Device. When this dialog closes the installation is complete. The device
LED should blink and then remain on, to indicate that communication is established between the device and
your computer.
If the LED turns off
If the LED is on but then turns off, the computer has lost communication with the USB-1208LS. 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.
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