SeaLevel SeaLINK+ 485 User manual

Part # 2102
Sealevel Systems, Inc
155 Technology Place
P.O. Box 830
Liberty, SC 29657 USA
Phone: [phone]
FAX: [phone]
www.sealevel.com
SeaLINK+485
USER MANUAL
TM

Contents
INTRODUCTION ........................................................................ 1
OVERVIEW ...........................................................................................1
WHAT’S INCLUDED..............................................................................1
INSTALLATION.......................................................................... 2
OPERATING SYSTEM INSTALLATION ....................................................2
SYSTEM INSTALLATION .......................................................................2
CONFIGURATION...................................................................... 6
ELECTRICAL INTERFACE SELECTION.....................................................6
SWITCH EXAMPLES .............................................................................7
TECHNICAL DESCRIPTION ....................................................... 8
FEATURES............................................................................................8
CONNECTOR PIN ASSIGNMENTS (DB25 MALE)..................................8
SPECIFICATIONS....................................................................... 9
ENVIRONMENTAL SPECIFICATIONS.......................................................9
MANUFACTURING................................................................................9
POWER CONSUMPTION........................................................................9
MEAN TIME BETWEEN FAILURES (MTBF)..........................................9
PHYSICAL DIMENSIONS........................................................................9
APPENDIX A -TROUBLESHOOTING....................................... 10
APPENDIX B -HOW TO GET ASSISTANCE............................. 11
APPENDIX C -ELECTRICAL INTERFACE................................ 12
RS-530.............................................................................................12
RS-422.............................................................................................12
RS-485.............................................................................................13
APPENDIX D -ASYNCHRONOUS COMMUNICATIONS ............ 14
APPENDIX E -COMPLIANCE NOTICES................................... 15
FEDERAL COMMUNICATIONS COMMISSION STATEMENT...................15
EMC DIRECTIVE STATEMENT ...........................................................15

WARRANTY............................................................................ 16
Figures:
Figure 1-RS-530/422 4 Wire 485 (Default)....................................................7
Figure 2 -RS-485, 2 Wire with Echo ...............................................................7
Figure 3 -RS-485, 2 Wire No Echo.................................................................7
Figure 4 -Asynchronous Communications Bit Diagram...............................14
© 2001c Sealevel Systems, Incorporated. All rights reserved.

Introduction
Sealevel Systems SeaLINK+485 Page 1
Introduction
Overview
The Sealevel Systems SeaLINK+485 equips the PC with 1 USB to
RS-530/422/485 Asynchronous serial port providing a versatile interface for
common RS-530/422/485 needs. The advantage of this product over more
traditional approaches is that it doesn’t require opening the computer case, nor
does it require resources such as I/O ports or IRQ’s. It does require a system
that supports USB both in terms of hardware and operating system.
What’s Included
The SeaLINK+485 is shipped with the following items. If any of these items is
missing or damaged, contact the supplier.
•SeaLINK+485 USB to RS-530/422/485 Serial I/O Adapter
•USB Cable Part Number CA179 for Connecting to Upstream
Host/Hub
•Sealevel Software

Installation
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Installation
Operating System Installation
Choose Install Software at the beginning of the CD and select the Serial I/O
software drivers and install SeaCOM.
System 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+485: can be connected to any Upstream Type “A” port either at
the PC host or an Upstream Hub. The SeaLINK+485 is hot-pluggable, meaning
there is no need to power down your computer prior to installation. The
SeaLINK+485: requires no user hardware configuration since there are no
jumpers present on the card.
1. Connect SeaLINK+485 to an Upstream Host or Hub.
This indicates that the system has recognized the new device and will now
proceed to locate a driver.

Installation
Sealevel Systems SeaLINK+485 Page 3
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
Sealevel Systems SeaLINK+485 Page 4
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.

Installation
Sealevel Systems SeaLINK+485 Page 5
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, Programs group.

Configuration
Sealevel Systems SeaLINK+485 Page 6
Configuration
Electrical Interface Selection
The port on the SeaLINK+485 has the ability to be used as RS-530/422/485,
RS-422 or 2 wire RS-485. This is selectable via the 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 ON enables, adds and
connects. SW1 position OFF disables, removes and disconnects.
SW1 Function
1RS-485 Two Wire Auto Enable/Disable
2Echo Enable/Disable
3Adds or removes the 120 ohm termination
4Adds or removes the 1K ohm pull-up resistor in the RS-422/RS-485 receiver circuit (Receive data only)
5Adds or removes the 1K ohm pull-down resistor in the RS-422/RS-485 receiver circuit (Receive data only)
6Connects the TX+ to RX+ for RS-485 two wire operation
7Connects the TX-to RX-for RS-485 two wire operation
8Not Used

Configuration
Sealevel Systems SeaLINK+485 Page 7
Switch Examples
Please use the following examples to configure your adapter.
Figure 1-RS-530/422 4 Wire 485 (Default)
Figure 2-RS-485, 2 Wire with Echo
Figure 3-RS-485, 2 Wire No Echo
ON
1 2 3 4 5 6 7 8
OFF
RS-530/422
ON
RS-485 1 2 3 4 5 6 7 8
OFF
OFF
ON
RS-485 1 2 3 4 5 6 7 8
OFF