Advantech USB-4751 User manual

User Manual
USB-4751/4751L
48/24-channel Digital Input/
Output USB Module

USB-4751/4751L User Manual ii
Copyright
The documentation and the software included with this product are copyrighted 2023
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 manual may be reproduced, copied, translated, or transmitted
in any form or by any means without the prior written permission of Advantech Co.,
Ltd. The information provided in this manual is intended to be accurate and reliable.
However, Advantech Co., Ltd. assumes no responsibility for its use, nor for any
infringements of the rights of third parties that may result from its use.
Acknowledgments
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.
Product Warranty (2 years)
Advantech warrants the original purchaser that each of its products 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 that have been repaired or altered by
persons other than repair personnel authorized by Advantech, or products that have
been subject to misuse, abuse, accident, or improper installation. 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 testing, most
customers never need to use our repair service. If an Advantech product is defective,
it will be repaired or replaced free of charge during the warranty period. For out-of-
warranty repairs, customers will be billed according to the cost of replacement mate-
rials, service time, and freight. Please consult your dealer for more details.
If you believe your product to be defective, follow the steps outlined below.
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 displayed when the prob-
lem occurs.
2. Call your dealer and describe the problem. Please have your manual, product,
and any helpful information readily available.
3. If your product is diagnosed as defective, obtain a return merchandise authori-
zation (RMA) number from your dealer. This allows us to process your return
more quickly.
4. Carefully pack the defective product, a completed Repair and Replacement
Order Card, and a proof of purchase date (such as a photocopy of your sales
receipt) into a shippable container. Products returned without a proof of pur-
chase date are not eligible for warranty service.
5. Write the RMA number clearly on the outside of the package and ship the pack-
age prepaid to your dealer.
Part No. 2003475102 Edition 3
Printed in Taiwan January 2023

iii USB-4751/4751L User Manual
Declaration of Conformity
FCC Class A
This equipment has been tested and found to comply with the limits for a Class A dig-
ital device, pursuant to part 15 of the FCC Rules. These limits are designed to pro-
vide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Opera-
tion of this equipment in a residential area is likely to cause harmful interference. In
this event, users are required to correct the interference at their own expense.
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
type of cable is available from Advantech. Please contact your local supplier for
ordering information.
Test conditions for passing also include the equipment being operated within an
industrial enclosure. In order to protect the product from damage caused by electro-
static discharge (ESD) and EMI leakage, we strongly recommend the use of CE-
compliant industrial enclosure products.
Technical Support and Assistance
1. Visit the Advantech website at www.advantech.com/support to obtain the latest
product information.
2. Contact your distributor, sales representative, or Advantech's customer service
center for technical support if you need additional assistance. Please have the
following information ready before calling:
–Product name and serial number
–Description of your peripheral attachments
–Description of your software (operating system, version, application software,
etc.)
–A complete description of the problem
–The exact wording of any error messages
Document Feedback
To assist us with improving this manual, we welcome all comments and constructive
criticism. Please send all feedback in writing to [email protected].

USB-4751/4751L User Manual iv
Safety Precautions - Static Electricity
Follow these simple precautions to protect yourself from harm and the products from
damage.
To avoid electrical shock, always disconnect the power from the PC chassis
before manual handling. Do not touch any components on the CPU card or
other cards while the PC is powered on.
Disconnect the power before making any configuration changes. A sudden rush
of power after connecting a jumper or installing a card may damage sensitive
electronic components.

v USB-4751/4751L User Manual
Contents
Chapter 1 Introduction..........................................1
1.1 Introduction ............................................................................................... 2
1.2 Hardware Features ................................................................................... 2
1.3 Software Overview.................................................................................... 2
Chapter 2 Installation............................................3
2.1 Unpacking ................................................................................................. 4
2.2 Driver Installation ...................................................................................... 4
Figure 2.1 XNavi Installer ............................................................ 4
2.2.1 Software Development Using DAQNavi SDK ............................... 5
2.3 Hardware Installation ................................................................................ 5
2.4 Hardware Uninstallation............................................................................ 6
Figure 2.2 Uninstalling USB-4751/4751L .................................... 6
Chapter 3 Signal Connections .............................7
3.1 Overview ................................................................................................... 8
3.2 I/O Connectors.......................................................................................... 8
3.2.1 Pin Assignments ........................................................................... 8
Figure 3.1 I/O Connector Pin Assignment ................................... 8
Figure 3.2 CN1/CN2 .................................................................... 8
3.2.2 Pin Assignments CN1 ................................................................... 9
Table 3.1: .................................................................................... 9
3.2.3 Pin Assignments CN2 ................................................................... 9
Table 3.2: .................................................................................... 9
3.2.4 I/O Connector Signal Description................................................ 10
Table 3.3: I/O Connector Signal Descriptions ........................... 10
3.2.5 LED Indicator Status Description ................................................ 10
Table 3.4: Table 3.2: LED Indicator Status Description............. 10
3.3 Digital I/O Connections ........................................................................... 11
3.3.1 Digital Input Signal Connection (TTL DI/O, Pull-Up)................... 11
Figure 3.3 Digital input signal connection .................................. 11
3.3.2 Digital Output Signal Connection (TTL DI/O).............................. 12
Figure 3.4 Digital output signal connection................................ 12
3.3.3 Counter Input Signal Connection (TTL, Pull-Up) ........................ 12
Figure 3.5 Counter input signal connection ............................... 12
3.3.4 Counter Output Signal Connection (TTL) ................................... 13
Figure 3.6 Counter output signal connection ............................. 13
3.4 Field Wiring Considerations .................................................................... 13
Appendix A Specifications ....................................15
A.1 Digital Input/Output ................................................................................. 16
A.2 Digital Input ............................................................................................. 16
A.3 Digital Output .......................................................................................... 16
A.4 General-Purpose Counter ....................................................................... 17
A.5 General Specifications ............................................................................ 17

USB-4751/4751L User Manual vi

Chapter 1
1Introduction
Sections include:
Introduction
Features
Specifications

USB-4751/4751L User Manual 2
1.1 Introduction
Thank you for buying the Advantech’s USB-4751/4751L data acquisition module.
The Advantech USB-4751/4751L is a powerful data acquisition (DAS) module for the
USB port. It features a unique circuit design and complete functions for data acquisi-
tion and control.
1.2 Hardware Features
USB-4751/4751L features excellent measurement & control functions:
48/24 digital input/output channels
50-pin box header
Interrupt handling
Programmable Counter/Timer
Supports both dry and wet contact
Compatible with USB 1.1/2.0
Bus-powered
1.3 Software Overview
Advantech offers device drivers, SDKs, third-party driver support and application
software to help fully exploit the functions of your DAQ devices. All these software
packages are available on Advantech website: http://www.advantech.com/.
The Advantech Navigator is a utility that allows you to set up, configure and test your
device, and later stores your settings in a proprietary database.
1. To set up the I/O device for your card, you could first run the Advantech Naviga-
tor program (by accessing Start/Programs/Advantech Automation/DAQNavi/
Advantech Navigator). The settings could also be saved to XML file, that can be
loaded in the applications using LoadProfile API.
2. You can then view the device(s) already installed on your system (if any) on the
Installed Device tree view. If the software and hardware installation are com-
pleted, you will see the device in the Installed Devices list.
Note! You can install up to sixteen USB-4751/4751L’s to a system because of
the maximum number limit of the device BoardID.
Note! The power output of an USB port is 500 mA, while the USB-4751/4751L
requires 500mA (Max.). This means that if an USB hub is used, it will
need an external power supply to support more than one USB-4751/
4751L device.
Note! For detailed specifications of USB-4751/4751L, please refer to Appendix
A, Specifications.

Chapter 2
2Installation
Sections include:
Unpacking
Driver Installation
Hardware Installation
Hardware Uninstallation

USB-4751/4751L User Manual 4
2.1 Unpacking
After receiving your USB-4751/4751L package, please inspect its contents first. The
package should contain the following items:
USB-4751/4751L Module
Shielded USB 2.0 Cable (1.72 m)
User Manual
The USB-4751/4751L 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 anti-static plastic bag, you should take following pre-
cautions to ward off possible ESD damage:
Touch the metal part of your computer chassis with your hand to discharge static
electricity accumulated on your body. One can also use a grounding strap.
Make contact between the anti-static 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 depart-
ment or our local sales representative immediately. Avoid using a damaged module
with your system.
Avoid physical contact with materials that could hold static electricity such as
plastic, vinyl and Styrofoam.
2.2 Driver Installation
The driver package could be found on Advantech Support Portal (https://www.advan-
tech.com/support). Search for USB-4751/4751L on the support portal, then the corre-
sponded driver/SDK package could be found. You’ll get the XNavi installer after the
download session finishes.
Execute the installer, then it will guide you through the session. You can choose the
device and software components you’d like to install in the system (Figure 2.1). After
the selection, click on “start” to begin the installation.
Figure 2.1 XNavi Installer

5 USB-4751/4751L User Manual
Chapter 2 Installation
2.2.1 Software Development Using DAQNavi SDK
DAQNavi SDK is the software development kit for programming applications with
Advantech DAQ products. The necessary runtime DLL, header files, software man-
ual and tutorial videos could be installed via XNavi installer. They could be found
under C:\Advantech\DAQNavi (default directory) after the finishing the installation.
2.3 Hardware Installation
After the driver installation is completed, you can now go on to install the USB-4751/
4751L module in any USB port that supports the USB 1.1/2.0 standard, on your com-
puter. It is suggested that you refer to the computer’s user manual if you have any
doubts. Please follow the steps below to install the module on your system.
1. Touch the metal part on the surface of your computer to neutralize the static
electricity that might be in your body.
2. Plug your USB module into the selected USB port. Use of excessive force must
be avoided; otherwise the module might get damaged.
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 driver first, operat-
ing systems will recognize your module as an “unknown device” after
reboot, and will prompt you to provide necessary driver. You should
ignore the prompting messages (just click the Cancel button) and set up
the driver according to the steps described in Section 2.2 Driver Installa-
tion.

USB-4751/4751L User Manual 6
2.4 Hardware Uninstallation
Though the Advantech USB modules are hot swappable, we still recommend you to
follow the hardware uninstallation procedure to avoid any unpredictable damage to
your device or your system.
1. Close the applications of the USB module.
2. Open the Windows Device Manager and right click on the Advantech USB-
4751/4751L Device”. Then select the “Uninstall” to remove the USB-4751/
4751L.
Figure 2.2 Uninstalling USB-4751/4751L
3. Unplug your USB device from the USB port.
Note! Please make sure that you have closed the application before unplug-
ging the USB device, otherwise unexpected system error or damage
may occur.

Chapter 3
3Signal Connections
Sections include:
Overview
Digital I/O Connections
Field Wiring Considerations

USB-4751/4751L User Manual 8
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 hard-
ware devices.
3.2 I/O Connectors
USB-4751/4751L is equipped with plug-in screw-terminal connectors that facilitate
connection to the module without terminal boards or cables.
3.2.1 Pin Assignments
Figure 3.1 I/O Connector Pin Assignment
Figure 3.2 CN1/CN2

9 USB-4751/4751L User Manual
Chapter 3 Signal Connections
3.2.2 Pin Assignments CN1
3.2.3 Pin Assignments CN2
Table 3.1:
CN1
Pin Number Pin Name Description
1 PC07 Digital input/output port C0 channel 7
3 PC06 Digital input/output port C0 channel 6
5 PC05 Digital input/output port C0 channel 5
7 PC04 Digital input/output port C0 channel 4
9 PC03 Digital input/output port C0 channel 3
11 PC02 Digital input/output port C0 channel 2
13 PC01 Digital input/output port C0 channel 1
15 PC00 Digital input/output port C0 channel 0
17 PB07 Digital input/output port B0 channel 7
19 PB06 Digital input/output port B0 channel 6
21 PB05 Digital input/output port B0 channel 5
23 PB04 Digital input/output port B0 channel 4
25 PB03 Digital input/output port B0 channel 3
27 PB02 Digital input/output port B0 channel 2
29 PB01 Digital input/output port B0 channel 1
31 PB00 Digital input/output port B0 channel 0
33 PA07 Digital input/output port A0 channel 7
35 PA06 Digital input/output port A0 channel 6
37 PA05 Digital input/output port A0 channel 5
39 PA04 Digital input/output port A0 channel 4
41 PA03 Digital input/output port A0 channel 3
43 PA02 Digital input/output port A0 channel 2
45 PA01 Digital input/output port A0 channel 1
47 PA00 Digital input/output port A0 channel 0
49 +5V_OUT +5V DC Power
2, 4, 6, 8, 10, 12, 14, 16, 18,
20, 22, 24, 26, 28, 30, 32, 34,
36, 38, 40, 42, 44, 46, 48, 50
GND Ground
Table 3.2:
CN2 (USB-4751 only)
Pin Number Pin Name Description
1 PC17 Digital input/output port C1 channel 7
3 PC16 Digital input/output port C1 channel 6
5 PC15 Digital input/output port C1 channel 5
7 PC14 Digital input/output port C1 channel 4
9 PC13 Digital input/output port C1 channel 3
11 PC12 Digital input/output port C1 channel 2
13 PC11 Digital input/output port C1 channel 1
15 PC10 Digital input/output port C1 channel 0

USB-4751/4751L User Manual 10
3.2.4 I/O Connector Signal Description
3.2.5 LED Indicator Status Description
The USB Module is equipped with a LED indicator to show the current status of the
device. When you plug the USB device into the USB port, the LED indicator will blink
five times and then stay lit to indicate that it is on. Please refer to the following table
for detailed LED indicator status information.
17 PB17 Digital input/output port B1 channel 7
19 PB16 Digital input/output port B1 channel 6
21 PB15 Digital input/output port B1 channel 5
23 PB14 Digital input/output port B1 channel 4
25 PB13 Digital input/output port B1 channel 3
27 PB12 Digital input/output port B1 channel 2
29 PB11 Digital input/output port B1 channel 1
31 PB10 Digital input/output port B1 channel 0
33 PA17 Digital input/output port A1 channel 7
35 PA16 Digital input/output port A1 channel 6
37 PA15 Digital input/output port A1 channel 5
39 PA14 Digital input/output port A1 channel 4
41 PA13 Digital input/output port A1 channel 3
43 PA12 Digital input/output port A1 channel 2
45 PA11 Digital input/output port A1 channel 1
47 PA10 Digital input/output port A1 channel 0
49 +5V_OUT +5VDC Power
2, 4, 6, 8, 10, 12, 14, 16, 18,
20, 22, 24, 26, 28, 30, 32,
34, 36, 38, 40, 42, 44, 46,
48, 50
GND Ground
Table 3.2:
Table 3.3: I/O Connector Signal Descriptions
Pin Name Description
C<1…2>_IN Counter input terminals
C<1…2>_GATE Counter gate input terminals
C<1…2>_OUT Counter output terminals
INT_OUT Interrupt output terminal
GND Ground
Table 3.4: Table 3.2: LED Indicator Status Description
LED Status Description
ON Device ready for work ON Device ready for work
Off Device not ready to work Off Device not ready to work
Slow Blinking (5 times) Device Initialization
Fast Blinking Device working

11 USB-4751/4751L User Manual
Chapter 3 Signal Connections
3.3 Digital I/O Connections
3.3.1 Digital Input Signal Connection (TTL DI/O, Pull-Up)
A digital input/output (DI/O) channel can be configured by software to perform digital
input measurement, which is the power-on default configuration, or digital output
generation. When performing digital input measurement, the voltage logic level
between the digital input (DI) terminal and the digital ground (DGND) terminal is mea-
sured. To prevent undetermined or fluctuating results when input is floating, the digi-
tal input channel is internally pulled-up. This is shown in Figure 3.3.
Figure 3.3 Digital input signal connection

USB-4751/4751L User Manual 12
3.3.2 Digital Output Signal Connection (TTL DI/O)
A digital input/output (DI/O) channel can be configured by software to perform digital
input measurement, which is the power-on default configuration, or digital output
generation. When performing digital output generation, a voltage logic level is gener-
ated between the digital output (DO) terminal and the digital ground (DGND) termi-
nal. This is shown in Figure 3.4.
Figure 3.4 Digital output signal connection
Each digital output channel can source or sink only finite amount of current. If this
limit is exceeded, the output voltage will not stay in the specified voltage logic level.
Refer to the device specifications for the maximum source and skin current values.
3.3.3 Counter Input Signal Connection (TTL, Pull-Up)
The voltage logic level between the counter input (counter clock, counter gate,
counter arm, and sample clock) terminals and the digital ground (DGND) terminal is
measured. To prevent undetermined or fluctuating results when input is floating, the
counter input signals are internally pulled-up. This is shown in Figure 3.5.
Figure 3.5 Counter input signal connection

13 USB-4751/4751L User Manual
Chapter 3 Signal Connections
3.3.4 Counter Output Signal Connection (TTL)
A voltage logic level is generated between the counter output terminal and the digital
ground (DGND) terminal. This is shown in Figure 3.6.
Figure 3.6 Counter output signal connection
Each counter output channel can source or sink only finite amount of current. If this
limit is exceeded, the output voltage will not stay in the specified voltage logic level.
Refer to the device specifications for the maximum source and skin current values.
3.4 Field Wiring Considerations
When you use USB-4751/4751L to acquire data from outside, noises in the
environment might significantly affect the accuracy of your measurements if due
cautions are not taken. The following measures will be helpful to reduce possi-
ble interference running signal wires between signal sources and the USB-
4751/4751L.
The signal cables must be kept away from strong electromagnetic sources such
as power lines, large electric motors, circuit breakers or welding machines since
they may cause strong electromagnetic interference. Keep the analog signal
cables away from any video monitor, since it can significantly affect a data
acquisition system.
If the cable travels through an area with significant electromagnetic interference,
you should adopt individually shielded, twisted-pair wires as the analog input
cable. This type of cable has its signal wires twisted together and shielded with
a metal mesh. The metal mesh should only be connected to one point at the sig-
nal source ground.
Avoid running the signal cables through any conduit that might have power lines
in it.
If you have to place your signal cable parallel to a power line that has a high
voltage or high current running through it, try to keep a safe distance between
them. Or place the signal cable in a right angle to the power line to minimize the
undesirable effect.

USB-4751/4751L User Manual 14