Advantech USB-4702 User manual

USB-4702
10 kS/s, 12-bit, USB
Multifunction Module
User Manual

USB-4702 User Manual ii
Copyright
The documentation and the software included with this product are copy-
righted 2009 by Advantech Co., Ltd. All rights are reserved. Advantech
Co., Ltd. reserves the right to make improvements in the products
described in this manual at any time without notice. No part of this man-
ual may be reproduced, copied, translated or transmitted in any form or
by any means without the prior written permission of Advantech Co., Ltd.
Information provided in this manual is intended to be accurate and reli-
able. However, Advantech Co., Ltd. assumes no responsibility for its use,
nor for any infringements of the rights of third parties, which may result
from its use.
Acknowledgements
Intel and Pentium are trademarks of Intel Corporation.
Microsoft Windows and MS-DOS are registered trademarks of
Microsoft Corp.
All other product names or trademarks are properties of their respective
owners.
1st Edition
Printed in Taiwan August 2009

iii
Product Warranty (2 years)
Advantech warrants to you, the original purchaser, that each of its prod-
ucts will be free from defects in materials and workmanship for two years
from the date of purchase.
This warranty does not apply to any products which have been repaired or
altered by persons other than repair personnel authorized by Advantech,
or which have been subject to misuse, abuse, accident or improper instal-
lation. Advantech assumes no liability under the terms of this warranty as
a consequence of such events.
Because of Advantech’s high quality-control standards and rigorous test-
ing, most of our customers never need to use our repair service. If an
Advantech product is defective, it will be repaired or replaced at no
charge during the warranty period. For out-of-warranty repairs, you will
be billed according to the cost of replacement materials, service time and
freight. Please consult your dealer for more details.
If you think you have a defective product, follow these steps:
1. Collect all the information about the problem encountered. (For
example, CPU speed, Advantech products used, other hardware
and software used, etc.) Note anything abnormal and list any
onscreen messages you get when the problem occurs.
2. Call your dealer and describe the problem. Please have your man-
ual, product, and any helpful information readily available.
3. If your product is diagnosed as defective, obtain an RMA (return
merchandize authorization) number from your dealer. This allows
us to process your return more quickly.
4. Carefully pack the defective product, a fully-completed Repair and
Replacement Order Card and a photocopy proof of purchase date
(such as your sales receipt) in a shippable container. A product
returned without proof of the purchase date is not eligible for war-
ranty service.
5. Write the RMA number visibly on the outside of the package and
ship it prepaid to your dealer.

USB-4702 User Manual iv
CE
This product has passed the CE test for environmental specifications
when shielded cables are used for external wiring. We recommend the use
of shielded cables. This kind of cable is available from Advantech. Please
contact your local supplier for ordering information.
Technical Support and Assistance
Step 1. Visit the Advantech web site at www.advantech.com/support
where you can find the latest information about the product.
Step 2. Contact your distributor, sales representative, or Advantech's cus-
tomer service center for technical support if you need additional
assistance. Please have the following information ready before
you call:
- Product name and serial number
- Description of your peripheral attachments
- Description of your software (operating system, version, appli-
cation software, etc.)
- A complete description of the problem
- The exact wording of any error messages
Document Feedback
To assist us in making improvements to this manual, we would welcome
comments and constructive criticism. Please send all such - in writing to:
[email protected]
Safety Precaution - Static Electricity
Follow these simple precautions to protect yourself from harm and the
products from damage.
1. To avoid electrical shock, always disconnect the power from your
PC chassis before you work on it. Don't touch any components on
the CPU card or other cards while the PC is on.
2. Disconnect power before making any configuration changes. The
sudden rush of power as you connect a jumper or install a card may
damage sensitive electronic components.

v Table of Contents
Contents
Chapter 1 Introduction ..................................................... 2
1.1 Features ............................................................................. 2
1.2 Software Overview............................................................ 3
1.2.1 More on the CD ............................................................. 3
Chapter 2 Installation ....................................................... 6
2.1 Unpacking ......................................................................... 6
2.2 Driver Installation ............................................................. 7
2.3 Hardware Installation ........................................................ 9
2.4 Hardware Uninstallation ................................................... 9
Figure 2.1:Unplug or Eject Hardware Dialog .............. 10
Figure 2.2:Stop a Hardware device dialog box ............ 10
Chapter 3 Signal Connections ........................................ 12
3.1 Overview ......................................................................... 12
3.2 I/O Connectors ................................................................ 12
3.2.1 Pin Assignments .......................................................... 12
Figure 3.1:I/O Connector Pin Assignment .................. 12
3.2.2 I/O Connector Signal Description ............... 13
Table 3.1:I/O Connector Signal Description ............... 13
3.3 Analog Input Connections............................................... 13
3.3.1 Single-ended Channel Connections ............................. 13
Figure 3.2:Single-Ended Input Channel Connection ... 14
3.3.2 Differential Input Connections .................................... 14
Figure 3.3:Differential Input Channel Connection ...... 15
3.4 Analog Output Connections (Voltage)............................ 15
Figure 3.4:Analog Output Channel Connections ......... 15
3.5 External Trigger Source Connections ............................. 16
3.6 Field Wiring Considerations ........................................... 16
Appendix A Specifications ................................................. 18
A.1 Analog Input ................................. 18
A.2 Analog Output ................................ 19
A.3 Non-Isolated Digital Input/Output ................ 19
A.4 Counter ..................................... 19
A.5 General ............................................................................ 19

USB-4702 User Manual vi

2
CHAPTER
1
Introduction
This chapter will provide information
on the features of the DAS module, a
quick start guide for installation, and
some brief information on software and
accessories for USB-4702 Module.
Sections include:
• Features
• Software Overview

USB-4702 User Manual 2
Chapter 1 Introduction
Thank you for buying the Advantech USB-4702 data acquisition module.
The Advantech USB-4702 is a powerful data acquisition (DAS) module
for the USB port. It features a unique circuit design and complete func-
tions for data acquisition and control.
1.1 Features
USB-4702 has the most requested measurement & control functions:
• 8 single-ended/ 4 differential or combination analog input channels
• 12-bit resolution A/D converter, with up to 10 kS/s sampling rate
• 8 digital input & 8 digital output channels (TTL Level)
• 2 analog output channels
• 16-bit programmable counter/timer x 1
• Programmable gain for each analog input channel
• Automatic channel/gain scanning
• Onboard 512K samples FIFO buffer for AI channels
• Bus-powered
• Supports high-speed USB 2.0
• Auto calibration function
• Hot swappable
Note: The USB chip on your system may have a limitation on
the number of USB devices it will support. Normally,
only five USB-4702 devices can be supported.
Note: The power output of an USB port is 500 mA, while the
USB-4702 requires 500 mA (max.). This means that if
an USB hub is used, it will need an external power sup-
ply to support more than one USB-4702 device.

3 Chapter1
1.2 Software Overview
Advantech offers a rich set of DLL drivers, third-party driver support and
application software on the companion CD-ROM to help fully exploit the
functions of your device. Advantech’s Device Drivers feature a complete
I/O function library to help boost your application performance and work
seamlessly with development tools such as Visual C++, Visual Basic,
Inprise C++ Builder, and Inprise Delphi.
1.2.1 More on the CD
For instructions on how to begin programming in each development tool,
Advantech offers some tutorial chapters in the Device Drivers Manual for
your reference. Please refer to the corresponding sections in these chap-
ters on the Device Drivers Manual to begin your programming efforts.
You can also look at the example source code provided for each program-
ming tool, since they can get you very well oriented.
The Device Drivers Manual can be found on the companion CD-ROM.
Alternatively, if you have already installed the Device Drivers on your
system, The Device Drivers Manual can be readily accessed through the
Start button:
Start/Programs/Advantech Automation/Advantech Device Manager /
Device Driver’s Manual
After you install the examples, (in CD-ROM:\Example\) the example
source code can be found under the corresponding installation folder such
as the default installation path:
\Program Files\Advantech\ADSAPI\Examples

USB-4702 User Manual 4

2
CHAPTER
2
Installation
Sections include:
• Unpacking
• Driver Installation
• Hardware Installation
• Hardware Uninstallation

USB-4702 User Manual 6
Chapter 2 Installation
2.1 Unpacking
After receiving your USB-4702 package, please inspect its contents first.
The package should contain the following items:
• USB-4702 Module
• Shielded USB 2.0 Cable (1.8 m)
• Companion CD-ROM (DLL driver included)
• User Manual
The USB-4702 Module harbors certain electronic components vulnerable
to electrostatic discharge (ESD). ESD could easily damage the integrated
circuits and certain components if preventive measures are not carefully
paid attention to. Before removing the module from the antistatic plastic
bag, you should take following precautions to ward off possible ESD
damage:
• Touch the metal part of your computer chassis with your hand to dis-
charge static electricity accumulated on your body. One can also use a
grounding strap.
• Make contact between the antistatic bag and ground before opening.
After taking out the module, you should first:
Inspect the module for any possible signs of external damage (loose or
damaged components, etc.). If the module is visibly damaged, please
notify our service department or our local sales representative immedi-
ately. Avoid using a damaged module with your system.
• Avoid physical contact with materials that could hold static electricity
such as plastic, vinyl and Styrofoam.

7 Chapter2
2.2 Driver Installation
We recommend you install the software driver before you install the
USB-4702 module into your system, since this will guarantee a smooth
installation process.
The 32-bit DLL driver Setup program for the USB-4702 module is
included on the companion CD-ROM that is shipped with your module
package. Please follow the steps on the following page to install the
driver software:

USB-4702 User Manual 8
For further information on driver-related issues, an online version of the
Device Drivers Manual is available by accessing the following path:
Start\Programs\Advantech Automation
\Device Manager\Device Driver’s Manual

9 Chapter2
2.3 Hardware Installation
After the DLL driver installation is completed, you can now go on to
install the USB-4702 module in any USB port that supports the
USB 1.1/2.0 standard, on your computer. Please follow the steps below to
install the module on your system.
Step 1: Touch the metal part on the surface of your computer to neutralize
the static electricity that might be in your body.
Step 2: Plug your USB module into the selected USB port. Use of exces-
sive force must be avoided; otherwise the module might get damaged.
After your module is installed, you can configure it using the Advantech
Device Manager. The Device Driver's Manual can be found at:
Start\Programs\Advantech Automation\Advantech Device Man-
ager\Device Driver’s Manual
2.4 Hardware Uninstallation
Though the Advantech USB modules are hot swappable, we still recom-
mend you to follow the hardware un-installation procedure to avoid any
unpredictable damages to your device or your system.
Step1: Close the applications of the USB module.
Step2: Right click the “Unplug or Eject Hardware” icon on your task bar.
Note: Make sure you have installed the software driver
before you install the module (please refer to
Section 2.2 Driver Installation)
Note: In case you installed the module without installing
the DLL driver, Win2000/XP will recognize your
module as an “unknown device”. After reboot,it will
prompt you to provide necessary driver. You should
ignore the prompting messages and set up the
driver according to the steps described in Sec.2.2.

USB-4702 User Manual 10
Figure 2.1: Unplug or Eject Hardware Dialog
Step3: Select “Advantech USB-4702 Device” and press “Stop” Button.
Figure 2.2: Stop a Hardware device dialog box
Step4: Unplug your USB device from the USB port.
Note: Please make sure that you have closed the application
before unplugging the USB device, otherwise unex-
pected system error or damage may occur.

2
CHAPTER
3
Signal Connections
This chapter provides useful informa-
tion on how to connect input and output
signals to the USB-4702 via the I/O
connectors.
Sections include:
• Overview
• I/O Connectors
• Analog Input Connections
• Analog Output Connections
• Trigger Source Connections
• Field Wiring Considerations

USB-4702 User Manual 12
Chapter 3 Signal Connections
3.1 Overview
Maintaining good signal connections is one of the most important factors
in ensuring that your application system is sending and receiving data
correctly. A good signal connection can avoid unnecessary and costly
damage to your PC and other hardware devices.
3.2 I/O Connectors
USB-4702 is equipped with one DB-37 connector that facilitates signal
connections to the module.
3.2.1 Pin Assignments
Figure 3.1: I/O Connector Pin Assignment
Warning: The two ground references AGND and DGND should
be used separately for their designated purpose.
Do not connect them together.

13 Chapter3
3.2.2 I/O Connector Signal Description
3.3 Analog Input Connections
USB-4702 supports 8 single-ended/ 4 differential analog inputs. Each
individual input channel is software-selected.
3.3.1 Single-ended Channel Connections
The single-ended input configuration has only one signal wire for each
channel, and the measured voltage (Vm) is the voltage of the wire as ref-
erenced against the common ground.
A signal source without a local ground is also called a “floating source”.
It is fairly simple to connect a single-ended channel to a floating signal
source. In this mode, USB-4702 provides a reference ground for external
floating signal sources.
Figure 3.2 shows a single-ended channel connection between a floating
signal source and an input channel on USB-4702.
Table 3.1: I/O Connector Signal Description
Signal Name Reference Direction Description
AI<0…7> AGND Input Analog Input Channels 0
through 7.
AO0, AO1 AGND Output Analog Input Channels 0 and 1.
AGND - - Analog Ground.
DI<0…7> DGND Input Digital Input Channels 0
through 7.
DO<0…7> DGND Output Digital Output Channels 0
through 7.
DGND - - Digital Ground.
COUNT DGND Input Counter Input.
TRIG DGND Input A/D External Trigger.
+2.5V AGND Output 2.5V DC Voltage Output.
+5V AGND Output 5V DC Voltage Output.

USB-4702 User Manual 14
Figure 3.2: Single-Ended Input Channel Connection
3.3.2 Differential Input Connections
The differential input channels operate with two signal wires for each
channel, and the voltage difference between both signal wires is mea-
sured. On USB-4702, when all channels are configured to differential
input, up to 4 analog channels are available.
If one side of the signal source is connected to a local ground, the signal
source is ground-referenced. Therefore, the ground of the signal source
and the ground of the card will not be exactly of the same voltage. The
difference between the ground voltages forms a commonmode voltage
(Vcm ).
To avoid the ground loop noise effect caused by common-mode voltages,
you can connect the signal ground to the Low input. Figure 3.3 shows a
differential channel connection between a grounded-reference signal
source and an input channel on USB-4702. With this connection, the
PGIA rejects a common-mode voltage Vcm between the signal source and
USB-4702 ground, shown as Vcm in Figure 3.3.
Note: In differential input mode, the input channel nshould be used with
channel n+1. (n=0,2,4,6)