SeaLevel SeaLINK plus 485I User manual

Part # 2104
SeaLINK+485I
USER MANUAL
TM
M
Sealevel Systems, Inc. Phone: [phone]
PO Box 830 Fax: [phone]
Liberty, SC 29657 USA www.sealevel.com

Contents
INTRODUCTION........................................................................ 1
INSTALLATION INSTRUCTIONS................................................ 2
WINDOWS 98/ME/2000/XP/VISTA™OPERATING SYSTEMS..........2
PHYSICAL INSTALLATION...............................................................3
CONFIGURATION ..................................................................... 7
ELECTRICAL INTERFACE SELECTION ..............................................7
SWITCH EXAMPLES.........................................................................8
TECHNICAL DESCRIPTION....................................................... 9
SPECIFICATIONS .................................................................... 10
APPENDIX A-TROUBLESHOOTING....................................... 11
APPENDIX B-HOW TO GET ASSISTANCE ............................ 12
APPENDIX C-ELECTRICAL INTERFACE............................... 13
APPENDIX D-GROUND LOOP PHENOMENON ...................... 14
APPENDIX E-ASYNCHRONOUS COMMUNICATIONS ............ 15
APPENDIX F-SILK-SCREEN.................................................. 16
APPENDIX G-COMPLIANCE NOTICES.................................. 17
WARRANTY............................................................................ 18
Figures
Figure 1- RS-422, 4 Wire RS-485 (Default).............................................8
Figure 2 - RS-485, 2 Wire with Echo........................................................8
Figure 3 - RS-485, 2 Wire No Echo..........................................................8
Figure 4 – SeaLINK+485I cabling example...........................................14
Figure 5 - Asynchronous Communications Bit Diagram .....................15
© Sealevel Systems, Inc.
SL9092 Revision 4/2007
Sealevel Systems, Incorporated. All rights reserved.

Introduction
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Introduction
Overview
The Sealevel Systems SeaLINK+485I equips the PC with 1 isolated USB to
RS-422/485 Asynchronous serial port providing a versatile interface for
common RS-422/485 needs. The SeaLINK+485I 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.
What’s Included
The SeaLINK+485I is shipped with the following items. If any of these items is
missing or damaged, contact the supplier.
•SeaLINK+485I Isolated USB to RS-422/485 Serial I/O Adapter
•USB Cable Part Number CA179 for Connecting to Upstream
Host/Hub
•Sealevel Software

Installation
Installation Instructions
Windows 98/ME/2000/XP/Vista™ Operating Systems
Do not connect the device to a USB port until the software is installed.
1. Start Windows.
2. Insert the Sealevel Software CD in to your CD drive.
3. If ‘Auto-Start’ is enabled the installation window will
automatically appear. Otherwise, navigate to the root directory of
your CD drive and double-click the ‘autorun.exe’ application to
launch the installation window.
4. Select ‘Install Software’.
5. Select the Part Number for your device from the listing.
6. The setup file will automatically detect the operating environment
and install the proper components. Follow the information
presented on the installation screens that follow.
7. A screen may appear with the declaration: “The publisher cannot
be determined due to the problems below: Authenticode signature
not found.” Please select the ‘Yes’ button and proceed with the
installation. This declaration simply means that the Operating
System is not aware of the driver being loaded. It will not cause
any harm to your system.
8. During setup, you may specify installation directories and other
preferred configurations. This program also adds entries to the
system registry that are necessary for specifying the operating
parameters for each driver. An uninstall option is included to
remove the driver and all registry/INI file entries from your
system.
9. Proceed with the physical installation of your SeaLINK USB serial
adapter.
NOTE:
Windows NT is not USB aware and thus cannot
support this device.
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Installation
Physical Installation
The screen captures below are taken from a Windows 98 installation. Your
particular operating system may differ slightly from what is shown based on
your version of windows.
The SeaLINK+485I can be connected to any Upstream Type “A” port either at
the PC host or an Upstream Hub. The SeaLINK+485I is hot-pluggable,
meaning there is no need to power down your computer prior to installation.
The SeaLINK+485I has an onboard 8 position dip switch that is used to
configure the interface. Prior to connecting the SeaLINK+485I, be sure to
configure this dip switch for your specific application. Please see the
Configuration section for more information. The SeaLINK+485I is defaulted to
RS-422 mode so changes are only required if you will be using the product in an
RS-485 application.
1. After installing the software connect SeaLINK+485I to an Upstream Host
or Hub.
This indicates that the system has recognized the new device and will now
proceed to locate a driver.
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Installation
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Since you have already installed the software by running “Setup”, simply click
“Next” to proceed. The drivers that were installed during setup will
automatically be used to configure the adapter for use.

Installation
Windows has now located a driver and installed the software. After the driver
has been located click “Finish. You should see one more “New Hardware
Found”, indicating the actual port being created. If you view your systems
Device Manager at this point, you should have a new “COM” port in the
Port(COM & LPT) Device Class. It should look similar to the screen shot on the
following page.
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Installation
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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 Programs, SeaCOM group.

Configuration
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Configuration
Electrical Interface Selection
The port on the SeaLINK+485I has the ability to be used in both half and full
duplex RS-422/485 applications. This is selectable through DIP-switch SW1.
The chart below describes each of the switch position’s function. Please refer to
the following page for switch setting examples. Switch SW1, in the “ON”
position, either enables, adds or connects, based on the function of the switch
position listed below. Switch SW1, position OFF, disables, removes or
disconnects .
SW1 Function
1 RS-485 Two Wire Auto Enable/Disable
2 Echo Enable/Disable
3 Adds or removes the 120 ohm termination
4 Adds or removes the 1K ohm pull-up resistor in the
RS-422/RS-485 receiver circuit (Receive data only)
5 Adds or removes the 1K ohm pull-down resistor in the
RS-422/RS-485 receiver circuit (Receive data only)
6 Connects the TX+ to RX+ for RS-485 two wire operation
7 Connects the TX- to RX- for RS-485 two wire operation
8 Not Used

Configuration
Switch Examples
Please use the following examples to configure your adapter.
ON
12345678
OFF
RS-422
Figure 1- RS-422, 4 Wire RS-485 (Default)
OFF
ON
RS-485 12345678
OFF
Figure 2 - RS-485, 2 Wire with Echo
ON
RS-485 12345678
OFF
Figure 3 - RS-485, 2 Wire No Echo
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