Measurement Computing USB-1616FS User manual

USB-1616FS
Measurement Advantage™ brand
USB-based Analog and Digital I/O
User's Guide
Document Revision 3, March, 2005
© Copyright 2005, Measurement Computing Corporation™

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USB-1616FS User's Guide
ii
HM USB-1616FS.doc
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iii
Table of Contents
Preface
About this User's Guide .......................................................................................................................v
What you will learn from this user's guide .........................................................................................................v
Conventions in this user's guide .........................................................................................................................v
Where to find more information .........................................................................................................................v
Chapter 1
Introducing the USB-1616FS............................................................................................................ 1-1
Overview: USB-1616FS features ................................................................................................................... 1-1
USB-1616FS block diagram........................................................................................................................... 1-2
Software features ............................................................................................................................................ 1-3
Connecting a USB-1616FS to your computer is easy..................................................................................... 1-3
Chapter 2
Installing the USB-1616FS................................................................................................................ 2-1
What comes with your USB-1616FS shipment? ............................................................................................ 2-1
Hardware ....................................................................................................................................................................... 2-1
Software......................................................................................................................................................................... 2-1
Documentation............................................................................................................................................................... 2-2
Unpacking the USB-1616FS .......................................................................................................................... 2-2
Installing the software .................................................................................................................................... 2-2
Installing the USB-1616FS............................................................................................................................. 2-2
Connecting the external power supply ........................................................................................................................... 2-2
Connecting the USB-1616FS to your system................................................................................................................. 2-3
Chapter 3
Functional Details ............................................................................................................................. 3-1
Theory of operation - analog input acquisition modes ................................................................................... 3-1
Software paced mode..................................................................................................................................................... 3-1
Continuous scan mode ................................................................................................................................................... 3-1
Burst scan mode............................................................................................................................................................. 3-1
Internal components ....................................................................................................................................... 3-2
USB OUT connector...................................................................................................................................................... 3-2
USB IN connector.......................................................................................................................................................... 3-2
External power connectors............................................................................................................................................. 3-3
USB LED....................................................................................................................................................................... 3-3
PWR LED...................................................................................................................................................................... 3-3
Screw terminal wiring.................................................................................................................................................... 3-3
Analog input terminals (CH0 IN to CH15 IN)............................................................................................................... 3-4
Digital I/O terminals (DIO0 to DIO7)............................................................................................................................ 3-5
Power terminals ............................................................................................................................................................. 3-6
Ground terminals ........................................................................................................................................................... 3-6
Counter terminal ............................................................................................................................................................ 3-7
Trigger terminal ............................................................................................................................................................. 3-7
SYNC terminal .............................................................................................................................................................. 3-7
Daisy chaining additional modules to the USB-1616FS ................................................................................ 3-7
Sample rate limitations when using multiple USB-1616FS devices .............................................................................. 3-8
Power limitations when using multiple USB-1616FS devices....................................................................................... 3-8
Accuracy......................................................................................................................................................... 3-8
Gain queue.................................................................................................................................................... 3-11
Synchronizing multiple units........................................................................................................................ 3-11

USB-1616FS User's Guide
iv
Chapter 4
Specifications ....................................................................................................................................4-1
Analog input section....................................................................................................................................... 4-1
Single board throughput................................................................................................................................................. 4-2
Multiple board throughput ............................................................................................................................................. 4-2
Throughput benchmarks ................................................................................................................................................ 4-3
Usage note ..................................................................................................................................................................... 4-3
Digital input/output ........................................................................................................................................ 4-4
External trigger............................................................................................................................................... 4-4
External clock input/output ............................................................................................................................ 4-4
Counter section............................................................................................................................................... 4-5
Memory .......................................................................................................................................................... 4-5
Microcontroller............................................................................................................................................... 4-5
Power.............................................................................................................................................................. 4-5
USB +5 V voltage .......................................................................................................................................... 4-6
External power input ...................................................................................................................................... 4-6
External power output .................................................................................................................................... 4-6
USB specifications ......................................................................................................................................... 4-6
Environmental ................................................................................................................................................ 4-6
Mechanical ..................................................................................................................................................... 4-7
Screw terminal connector type ....................................................................................................................... 4-7
Screw terminal pin out.................................................................................................................................... 4-7

v
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide explains how to install, configure, and use the USB-1616FS so that you get the most out
of its analog and digital I/O features. This user's guide also refers you to related documents available on our
web site, and to technical support resources.
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.
< # : # > Angle brackets that enclose numbers separated by a colon signify a range of numbers, such as those
assigned to registers, bit settings, etc.
bold text Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check
boxes. For example:
1. Insert the disk or CD and click the OK button.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
For example:
!The InstaCal® installation procedure is explained in the DAQ Software Quick Start.
!Never touch the exposed pins or circuit connections on the board.
Where to find more information
The following electronic documents provide information relevant to the operation of your Measurement
Advantage™ brand USB-1616FS.
!MCC's Specifications: USB-1616FS (the PDF version of Chapter 4 in this guide) is available on our
web site at www.mccdaq.com/pdfs/USB-1616FS.pdf.
!MCC's DAQ Software Quick Start is available on our web site at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.
!MCC's Universal Library User's Guide is available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-user-guide.pdf.
!MCC's Universal Library Function Reference is available on our web site at
http://www.mccdaq.com/PDFmanuals/sm-ul-functions.pdf.
!MCC's Universal Library for LabVIEW™User’s Guide is available on our web site at
www.mccdaq.com/PDFmanuals/SM-UL-LabVIEW.pdf.
!MCC's Guide to Signal Connections is available on our web site at
www.mccdaq.com/signals/signals.pdf.
USB-1616FS User’s Guide (this document) is available in PDF on our web site at
http://www.mccdaq.com/PDFmanuals/USB-1616FS.pdf.

1-1
Chapter 1
Introducing the USB-1616FS
Overview: USB-1616FS features
This user's guide contains all of the information you need to connect the USB-1616FS to your computer
and to the signals you want to measure. The USB-1616FS is part of the Measurement Advantage™ brand
of USB-based data acquisition products.
The USB-1616FS is a USB 2.0 full-speed device supported under Microsoft® Windows® 98 (2nd edition),
Windows ME, Windows 2000, and Windows XP.
The USB-1616FS provides true simultaneous sampling of up to sixteen 16-bit single-ended analog inputs.
Simultaneous input sampling is accomplished through the use of one A/D converter per channel. The
module features sampling rates of up to 50 kS/s per channel, and up to 9500 S/s per channel throughput for
all channels. You can configure the analog input range of each channel independently via software. An on-
board temperature sensor lets you monitor your environment temperature.
Eight digital IO lines are independently selectable as input or output. A 32-bit counter can count TTL
pulses. A SYNC (synchronization) control line lets you synchronize two USB-1616FS modules to acquire
data synchronously from 32 analog inputs.
The USB-1616FS is powered by an external +9 V unregulated power supply that is shipped with the board.
POWER OUT and USB OUT connectors let you power and control multiple Measurement Advantage
boards from one external power source and one USB port in a daisy chain fashion.
The USB-1616FS is enclosed in a rugged housing that you can mount on a DIN rail or on a bench. The
USB-1616FS is shown in Figure 1-1.
Figure 1-1. USB-1616FS

USB-1616FS User's Guide Introducing the USB-1616FS
1-2
USB-1616FS block diagram
USB-1616FS functions are illustrated in the block diagram shown here.
Screw terminal I/O connector
SPI
8
USB
Microcontroller
SYNC
USB
Full-speed
USB 2.0
Compliant
Interface 16
DIO
TRIG_IN
Screw terminal I/O connector
1
G= 1, 2,
5, 10
A/D 0 A/D 1 A/D 2 A/D 3 A/D 4 A/D 5 A/D 6 A/D 7 A/D 8 A/D 9
A/D 10
A/D 11
A/D 12 A/D 13 A/D 14 A/D 15
32-bit
Event Counter
1 channel
32k x 16
SRAM 16
16
USB
Cal Ref
V
oltages
Temp.
Sensor
Figure 1-2. USB-1616FS functional block diagram

USB-1616FS User's Guide Introducing the USB-1616FS
1-3
Software features
The following software ships with the USB-1616FS free of charge.
!InstaCal installation, calibration, and test utility
!TracerDAQ™ suite of virtual instruments
!SoftWIRE® for Visual Studio® .NET graphical programming
!MCC DAQ Components for VS .NET (installed with SoftWIRE® for VS .NET)
For information on the features of InstaCal, TracerDAQ, and SoftWIRE, refer to the DAQ Software Quick
Start booklet that shipped with the USB-1616FS.
Connecting a USB-1616FS to your computer is easy
Installing a data acquisition device has never been easier.
!The USB-1616FS 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-1616FS. No third-party device driver is required.
!The USB-1616FS is plug-and-play. There are no jumpers to position, DIP switches to set, or interrupts
to configure.
!You can connect the USB-1616FS 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
improves upon serial and parallel port connectors with one standardized plug and port combination.
!Data can flow two ways between a computer and peripheral over USB connections.
Make sure that you have the latest Windows Updates installed for your USB driver, particularly "XP Hotfix
KB822603."

2-1
Chapter 2
Installing the USB-1616FS
What comes with your USB-1616FS shipment?
As you unpack your USB-1616FS, verify that the following components are included.
Hardware
!USB-1616FS
!USB cable (24 AWG VBUS/GND, 2 meter length)
!External power supply and cord (CB-PWR-9V3A) – 9 volt, 3 amp DC power supply
Software
The Measurement Computing Data Acquisition Software CD contains the following software:
!InstaCal installation, calibration, and test utility
!TracerDAQ suite of virtual instruments
!SoftWIRE for VS .NET
!SoftWIRE MCC DAQ Components for .NET

USB-1616FS User's Guide Installing the USB-1616FS
2-2
Documentation
In addition to this hardware user's guide, you should also receive the DAQ Software Quick Start (available
in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf). Please read this booklet
completely before installing any software and hardware.
Unpacking the USB-1616FS
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the USB-1616FS 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 your USB-1616FS arrives already damaged, notify Measurement Computing Corporation immediately
by phone, fax, or email. For international customers, contact your local distributor where you purchased the
USB-1616FS.
!Phone: [phone] and follow the instructions for reaching Tech Support.
!Fax: [phone] to the attention of Tech Support
!Email: [e-mail]
Installing the software
Refer to the DAQ Software Quick Start for instructions on installing the software on the Measurement
Computing Data Acquisition Software CD. This booklet is available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.
Installing the USB-1616FS
Before you connect the USB-1616FS to your computer, connect the external power supply that was
shipped with the device.
You can connect up to four Measurement Advantage products in a daisy chain configuration to a single
USB 2.0 port on your computer. If your system has a USB 1.1 port, you can connect up to two
Measurement Advantage products.
Connecting the external power supply
Power to the USB-1616FS is provided with the +9 V external power supply (CB-PWR-9V3A). You must
connect the external power supply before connecting the USB cable to the USB-1616FS and your
computer.

USB-1616FS User's Guide Installing the USB-1616FS
2-3
To connect the power supply to your USB-1616FS, do the following.
1. Connect the external power cord to the POWER IN connector on the rear of the USB-1616FS
enclosure. This connector is labeled IN on the board.
2. Plug the power supply into a power outlet.
The PWR LED illuminates green when +9 V power is supplied to the USB-1616FS. If the voltage supply is
less than +6.0 V or more than +12.5 V, the PWR LED does not light.
Do not connect external power to the POWER OUT connector
The power connector labeled POWER OUT on the enclosure (OUT on the board) is used to provide power
to an additional Measurement Advantage product. If you connect the external power supply to the POWER
OUT connector, the USB-1616FS does not receive power, and the PWR LED does not illuminate.
Connecting the USB-1616FS to your system
To connect the USB-1616FS to your system, do the following.
1. Connect the USB cable that was shipped with the device to the USB connector labeled USB IN on
the USB-1616FS.
The USB cable supplied with the USB-1616FS has a higher gauge wire than generic USB cables, and
is required for proper enumeration of the USB-1616FS.
2. Connect the other end of the USB cable to a USB port on your computer or to an external USB hub
that is connected to your computer. The PWR LED illuminates green. The USB cable provides power
and communication to the USB-1616FS.
The USB-1616FS installs as a composite device with separate devices attached. When you connect the
USB-1616FS for the first time, Found New Hardware popup balloons (Windows XP) or dialogs (other
Windows versions) display as each USB-1616FS interface is detected. The USB LED blinks and then
remains lit during this enumeration.
It is normal for multiple dialogs to appear when you connect the USB-1616FS for the first time. For
additional information, refer to the "Notes on installing and using the USB-1616FS" that was shipped with
the USB-1616FS.
If you are running Windows XP and connect the USB-1616FS to a USB 1.1 port, a balloon displays the
message "Your USB device can perform faster if you connect to a USB 2.0 port." You can ignore this
message. The USB-1616FS will function properly when connected to a USB 1.1 port, although USB
bandwidth is limited.
After the USB-1616FS is installed the USB LED remains lit to indicate that communication is established
between the USB-1616FS and your computer.
If the USB LED turns off
If the USB LED is illuminated but then turns off, the computer has lost communication with the USB-
1616FS. To restore communication, disconnect the USB cable from the computer, and then reconnect it.
This should restore communication, and the USB LED should turn back on.

USB-1616FS User's Guide Installing the USB-1616FS
2-4
Caution! Do not disconnect any device from the USB bus while the computer is communicating with
the USB-1616FS, or you may lose data and/or your ability to communicate with the USB-
1616FS.
If your system does not detect the USB-1616FS
If a "USB device not recognized" message appears when you connect the USB-1616FS, do the following.
1. Unplug the USB cable from the USB-1616FS.
3. Unplug the external power cord from the POWER IN connector on the enclosure.
4. Plug the external power cord back into the POWER IN connector.
5. Plug the USB cable back into the USB-1616FS.
Your system should now properly detect the USB-1616FS hardware. Contact technical support if your
system still does not detect the USB-1616FS.
Removing USB-1616FS boards from Windows XP systems
Device Manager may require up to 30 seconds to detect the removal of a USB-1616FS board from a
Windows XP system with Service Pack 1 or Service Pack 2 installed. This time increases with each
additional connected board. If you remove four boards from your system, the time required for Device
Manager to update may be almost two minutes.
If you re-attach the USB-1616FS to your system before Device Manager updates, the USB LED will not
light. Your system will not detect that new hardware is installed until Device Manager first detects that
hardware has been removed.
The InstaCal software will be unresponsive during this re-detection time. Wait until Device Manager
updates with the new hardware before running InstaCal. The USB-1616FS has been detected by the system
when the USB LED on the USB-1616FS is illuminated.

3-1
Chapter 3
Functional Details
Theory of operation - analog input acquisition modes
The USB-1616FS can acquire analog input data in three basic modes – software paced, continuous scan,
and burst scan.
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 from any one
channel.
The maximum throughput sample rate in software paced mode is about 250 S/s, but may vary depending on
your system.
Continuous scan mode
You can acquire data from up to 16 channels simultaneously in continuous scan mode. The analog data is
continuously acquired, converted to digital values, and written to an on-board FIFO buffer on the USB-
1616FS until you stop the scan. The FIFO buffer is serviced in blocks as the data is transferred from the
USB-1616FS FIFO buffer to the memory buffer on your computer.
You can acquire data with the USB-1616FS from one channel at 50 kS/s and up to 16 channels at 9.5 kS/s
each. Table 4-1 on page 4-2 lists the throughput rates for 1 to 16 channels. You can start a continuous scan
with either a software command or with an external hardware trigger event.
Burst scan mode
In burst scan mode, you can acquire data with the USB-1616FS using the full capacity of its 32K sample
FIFO. The acquired data is then read from the FIFO and transferred to a user memory buffer on the
computer. You can initiate a single acquisition sequence for any number of input channels by either a
software command or an external hardware trigger.
Burst scans are limited to the depth of the on-board memory, as the data is acquired at a rate faster than it
can be transferred to the computer. The maximum sampling rate is an aggregate rate, where the total
acquisition rate for all channels is 200 kS/s divided by the number of channels. The maximum rate for each
channel is 50 kS/s. The maximum rate that you can acquire data using burst scan mode is 50 kS/s per
channel for one, two, or four channels, and 12.5 kS/s per channel for 16 channels.

USB-1616FS User's Guide Functional Details
3-2
Internal components
Major components on the USB-1616FS are shown in Figure 3-1.
!Two (2) USB connectors
!Two (2) external power connectors
!USB LED
!PWR LED
!Four (4) Screw terminal banks
PWR LED
USB LED
I/O screw terminal connectors I/O screw terminal connectors
USB IN
POWER
OUT
POWER IN
USB
OUT
Figure 3-1. USB-1616FS module components
USB OUT connector
The USB OUT connector is a downstream hub output port intended for use with other Measurement
Advantage products only. The USB hub is self-powered, and can provide 100 mA maximum current at 5 V.
The USB out connector is labeled USB OUT on the enclosure and on the board.
For information on daisy chaining to other Measurement Advantage products, refer to Daisy chaining
additional modules to the USB-1616FS on page 3-7.
USB IN connector
Connect the USB IN connector to the USB port on your computer (or USB hub connected to your
computer). The USB in connector is labeled USB IN on the enclosure and on the board.

USB-1616FS User's Guide Functional Details
3-3
External power connectors
The USB-1616FS has two external power connectors labeled POWER IN and POWER OUT on the
enclosure. The POWER IN connector is labeled IN on the board, and the POWER OUT connector is labeled
OUT on the board.
To supply external power, connect the POWER IN connector to the supplied +9 V external power supply
(CB-PWR-9V3A).
The POWER OUT connector lets you power additional daisy chained Measurement Advantage products
from a single external power supply. The C-MAPWR-xcable is available from MCC to connect additional
Measurement Advantage products.
USB LED
The USB LED indicates the communication status of the USB-1616FS. This LED uses up to 5 mA of
current and cannot be disabled. Table 3-1 explains the function of the USB LED.
Table 3-1. USB LED Illumination
USB LED
illumination
Indication
Steady green The USB-1616FS is connected to a computer or external USB hub.
Blinks continuously Initial communication is established between the USB-1616FS and the computer, or data
is being transferred.
PWR LED
The USB-1616FS incorporates an on-board voltage supervisory circuit that monitors the USB VBUS (5V)
and the external 9 V power supply. If the input voltage falls outside of the specified ranges the PWR LED
shuts off (see Table 3-2).
Table 3-2. PWR LED Illumination
PWR LED
illumination
Indication
Steady green USB +5 V power or +9 V external power is supplied to the USB-1616FS.
Off Input power is not supplied, or a power fault has occurred. A power fault occurs when the
input power falls outside of the specified voltage range:
USB VBUS (+5 V): 4.75 V to 5.25 V
External power: (+9 V): 6.0 V to 12.5 V
Screw terminal wiring
The USB-1616FS has two rows of screw terminals. Each row has 26 connections. Signal labels are shown
in Figure 3-2.
Figure 3-2. USB-1616FS screw terminals

USB-1616FS User's Guide Functional Details
3-4
The screw terminals provide the following connections:
!eight digital I/O terminals (DIO 0 to DIO 7)
!one external digital trigger terminal (TRIG IN)
!one power terminal (5V)
!eight ground terminals (GND 0 to 7)
!one external event counter terminal (CTR)
!one terminal for external clocking and multi-unit synchronization (SYNC)
!16 analog input terminals (CHANNEL IN 0 to 15)
!16 analog ground terminals (AGND 0 to 15)
Use 14 AWG to 30 AWG wire for your signal connections.
Caution! Keep the length of stripped wire at a minimum to avoid a short to the enclosure! When
connecting your field wiring to the screw terminals, use the strip gage on the terminal strip, or
strip to 5.5 - 7.0 mm (0.215" to 0.275") long.
Each screw terminal is identified with a label on the board and on the underside of the enclosure lid. Refer
to Table 3-3 for the signal name associated with each board label.
Table 3-3. Board labels and associated signal names
Board label Signal name Board label Signal name
0 DIO 0 0 GND 0
1 DIO 1 1 GND 1
2 DIO 2 2 GND 2
3 DIO 3 3 GND 3
4 DIO 4 4 GND 4
5 DIO 5 5 GND 5
6 DIO 6 6 GND 6
DIO
7 DIO 7
GND
7 GND 7
TRIG IN TRIG IN CTR CTR
5V 5V SYNC SYNC
0 CH 0 0 AGND 0
1 CH 1 1 AGND 1
2 CH 2 2 AGND 2
3 CH 3 3 AGND 3
4 CH 3 4 AGND 4
5 CH 4 5 AGND 5
6 CH 5 6 AGND 6
7 CH 6 7 AGND 7
8 CH 8 8 AGND 8
9 CH 9 9 AGND 9
10 CH 10 10 AGND 10
11 CH 11 11 AGND 11
12 CH 12 12 AGND 12
13 CH 13 13 AGND 13
14 CH 14 14 AGND 14
CHANNEL IN
15 CH 15
AGND
15 AGND 15
Analog input terminals (CH0 IN to CH15 IN)
You can connect up to 16 analog input connections (CH0 IN through CH15 IN) to the screw terminals
labeled Channel IN 0-15. We recommend that you connect unused analog input terminals to ground
terminals during operation. For example, if you are not using CH7 IN, connect this terminal to AGND 7.