SeaLevel SeaLINK+232I User manual

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
SEALINK+232I
User Manual | 2103

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
Contents
CONTENTS...........................................................................................................................................................2
INTRODUCTION ...................................................................................................................................................3
BEFORE YOU GET STARTED ...............................................................................................................................4
INSTALLATION .................................................................................................................................................... 5
HARDWARE INSTALLATION ............................................................................................................................... 6
TECHNICAL DESCRIPTION .................................................................................................................................8
SPECIFICATIONS ................................................................................................................................................. 9
APPENDIX A –TROUBLESHOOTING................................................................................................................10
APPENDIX B –HOW TO GET ASSISTANCE .....................................................................................................11
APPENDIX C –ELECTRICAL INTERFACE ........................................................................................................12
APPENDIX D –GROUND LOOP PHENOMENON..............................................................................................13
APPENDIX E –ASYNCHRONOUS COMMUNICATIONS ..................................................................................14
APPENDIX F –SILK-SCREEN ............................................................................................................................15
APPENDIX G –COMPLIANCE NOTICES ..........................................................................................................16
WARRANTY ........................................................................................................................................................17
................................................................................................................................................................................

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
Introduction
The Sealevel Systems SeaLINK+232I equips the PC with 1 isolated USB to RS-232 Asynchronous serial port
providing a versatile interface for common RS-232 needs (i.e., modem, mouse, and plotter). The
SeaLINK+232I connects through the PC’s external USB port, so it does not require opening the computer
case. Resources such as IRQ’s and I/O addresses are also not utilized. It does require a system that
supports USB in hardware and operating system.

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
Before You Get Started
What’s Included
The SeaLINK+232I is shipped with the following items. If any of these items is missing or
damaged, contact the supplier.
•SeaLINK+232I Isolated USB to RS-232 Serial I/O Adapter
•USB Cable Part Number CA179 for Connecting to Upstream Host/Hub
•DB25 to DB9 Converter, Part number CA140
Advisory Conventions
Warning
The highest level of importance used to stress a condition where damage could result to the
product, or the user could suffer serious injury.
Important
The middle level of importance used to highlight information that might not seem obvious or a
situation that could cause the product to fail.
Note
The lowest level of importance used to provide background information, additional tips, or other
non-critical facts that will not affect the use of the product.

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
Installation
Operating System Installation
For Windows Users
Begin by locating, selecting, and installing the correct software from the Sealevel software driver database.
SeaCOM software can also be downloaded from the 2103-product webpage: SeaLINK+232I Product
Other Operating Systems
Refer to the appropriate section of the Serial Utilities Software.
LINUX INSTALLATION
Refer to Linux Archives - Sealevel. This link contains valuable information on installing your serial adapter
in the various Linux releases. Also included is a series of files explaining proper Linux syntax and typical
Linux serial implementations.
For additional software support, please call Sealevel Systems’ Technical Support, [phone]. Our
technical support is free and available from 8:00AM-5PM Eastern Time, Monday through Friday. For email
support contact: mailto:supp[email protected].
You are now ready to proceed with connecting the 2103 to your system. Refer to the Hardware Installation
section for details.
Windows NT is not USB aware and thus cannot support this
device.

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
Hardware Installation
The screen captures below are taken from a Windows 7 installation. Your particular operating system may
differ slightly from what is shown based on your version of Windows.
The SeaLINK+232I can be connected to any Upstream Type “A” port either at the PC host or an Upstream
Hub. The SeaLINK+232I is hot-pluggable, meaning there is no need to power down your computer prior to
installation. The SeaLINK+232I requires no user hardware configuration since there are no jumpers present
on the card.
1. After installing the software connect SeaLINK+232I to an Upstream Host or Hub.
This indicates that the system has recognized the new device and will now proceed to locate and
automatically install the driver.
This window indicates that the device has been successfully installed. You may see these windows appear
as a balloon in the bottom right corner of your desktop momentarily instead of as a window. If you view
your system’s Device Manager at this point, you should have a new “COM” port in the Ports (COM & LPT)
Device Class. It should look similar to the screen shot on the following page.

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
Hardware Installation, Continued
You can access your new COM: port by using the assigned COM: identifier shown above. In this case, it is
COM5: but this assignment will vary from system to system. At this point, the hardware is recognized. To
verify operation, use Sealevel Systems supplied WinSSD diagnostic utility. WinSSD can be found in the
Start Menu, under the SeaCOM group.

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
Technical Description
The SeaLINK+232I utilizes a USB UART. This chip features programmable baud rate, data format, 128-byte
Dual Port RX Buffer, and 256-byte Dual Port TX Buffer. The RS-232 transceiver supports data rates up to
460.8K baud. Refer to Appendix C for cable length limitations.
Features
•Hot-Pluggable device that does not require opening the case
•No system resources are required (i.e., I/O ports or IRQ’s)
•LED status indicators for “USB Enabled”, “TD”, and “RD”
Connector Pin Assignments
DB-25 male
Name
Pin #
Mode
TD Transmit Data
2
Output
RD Receive Data
3
Input
RTS Request To Send
4
Output
CTS Clear To Send
5
Input
GND Ground
7
These assignments meet EIA/TIA/ANSI-232E DTE specifications for DB-25 type connectors.
The remaining modem control signals are biased internally in the following fashion: DTR is
connected to DCD and DSR, and RI is tied inactive.

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
Specifications
Environmental Specifications
Specification
Operating
Storage
Temperature Range
0º to 50º C (32º to 122º F)
-20º to 70º C (-4º to 158º F)
Humidity Range
10 to 90% R.H. Non-Condensing
10 to 90% R.H. Non-Condensing
Manufacturing
All Sealevel Systems Printed Circuit boards are built to UL 94V0 rating and are 100% electrically tested.
These printed circuit boards are solder mask over bare copper or solder mask over tin nickel.
Power Consumption
Supply line
+5 VDC
Rating
100 mA
Mean Time Between Failures (MTBF)
Greater than 150,000 hours. (Calculated)
Physical Dimensions
Package Length
3.8 inches (9.66 cm)
Package Width
2.3 inches (5.84 cm)
Package Height
1.0 inches (2.54 cm)

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© Sealevel Systems, Inc. 2103 Manual | SL9091 9/2021
Appendix A –Troubleshooting
Serial Utility test software is supplied with the Sealevel Systems adapter and will be used in the
troubleshooting procedures. Using this software and following these simple steps, most common
problems can be eliminated without the need to call Technical Support.
1. If your adapter isn’t working, first check to make sure that USB support is enabled in
the System BIOS and it is functioning properly in the operating system. This can be
done by using either the Windows 98/ME or Windows 2000 Device Manager.
2. Ensure that the Sealevel Systems software has been installed on the machine so that
the necessary files are in place to complete the installation.
3. When the SeaLINK+232I is configured properly, the USB Enabled LED (EN) will be lit.
This should allow you to use Sealevel’s WinSSD utility and the supplied loopback plug
to check communications. The supplied loopback plug connects TD to RD. If you
decide to test the Modem Control Signals, a full pin loopback plug will be required.
Details on loopback plugs are included within WinSSD. Contact Sealevel Systems if
you need further assistance.
4. When testing the SeaLINK+232I in loopback mode, you should see both the TD and RD
LED’s flashing as well as seeing echoed data on the screen. The loopback test first
transmits a HEX pattern, 55AA, and then an ASCII string of data. If this test passes,
then the SeaLINK+232I is ready for use in your application