SeaLINK+232I
TM
USER MANUAL
M
Part # 2103
Sealevel Systems, Inc. Phone: (864) 843-4343
PO Box 830 Fax: (864) 843-3067
Liberty, SC 29657 USA www.sealevel.com
Contents
INTRODUCTION........................................................................ 1
OVERVIEW......................................................................................1
WHAT’S INCLUDED ........................................................................1
INSTALLATION......................................................................... 2
OPERATING SYSTEM INSTALLATION...............................................2
SYSTEM INSTALLATION ..................................................................2
ECHNICAL DESCRIPTION....................................................... 6
T
FEATURES....................................................................................... 6
CONNECTOR PIN ASSIGNMENTS (DB25 MALE)..............................6
SPECIFICATIONS ...................................................................... 7
ENVIRONMENTAL SPECIFICATIONS.................................................7
MANUFACTURING...........................................................................7
POWER CONSUMPTION ...................................................................7
MEAN TIME BETWEEN FAILURES (MTBF).....................................7
PHYSICAL DIMENSIONS ..................................................................7
APPENDIX A - TROUBLESHOOTING.........................................8
APPENDIX B - HOW TO GET ASSISTANCE .............................. 9
APPENDIX C - ELECTRICAL INTERFACE...............................10
RS-232.........................................................................................10
APPENDIX D - GROUND LOOP PHENOMENON ...................... 11
WHAT IS GROUND LOOP?.............................................................11
CABLING RECOMMENDATIONS.....................................................11
APPENDIX E - ASYNCHRONOUS COMMUNICATIONS ............12
APPENDIX F - SILK-SCREEN..................................................13
APPENDIX G - COMPLIANCE NOTICES.................................. 14
FEDERAL COMMUNICATIONS COMMISSION STATEMENT ..............14
EMC DIRECTIVE STATEMENT ......................................................14
WARRANTY............................................................................15
Figures
Figure 1- SeaLINK+232I cabling example ............................................11
Figure 2 - Asynchronous Communications Bit Diagram .....................12
© Sealevel Systems, Inc.
SL9091 Revision 7/2006
Sealevel Systems, Incorporated. All rights reserved.
Introduction
Introduction
Overview
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 n ot utilized. It does
require a system that supports USB in hardware and operating system.
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 CA 140
• Sealevel Software
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Installation
Installation
Operating System Installation
Please note that you should install the software before installing the hardware.
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 ME 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 a driver.
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Installation
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.
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Installation
Windows has now located a driver and installed the software. Click “Finish” to
proceed. 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 Ports (COM & LPT) Device
Class. It should look similar to the screen shot on the following page.
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Installation
You can access your new COM: port by using the assigned COM: identifier
shown above. In this case, it is COM4: 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.
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Technical Description
Technical Description
The SeaLINK+232I utilizes a USB UART. This chip features programmable
baud rate, data format, 128 byte Dual Port TX Buffer, and 384 byte Dual Port
RX 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 (DB25 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
Note: These assignments meet EIA/TIA/ANSI-574 DTE specifications for
DB-25 type connectors.
Technical Note: The remaining modem control signals are biased in the
following fashion: DTR is connected to DCD and DSR, and RI is tied
inactive.
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Specifications
Specifications
Environmental Specifications
Specification Operating Storage
Temperature
Range
Humidity Range
0º to 50º C
(32º to 122º F)
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
-20º to 70º C
(-4º to 158º F)
10 to 90% R.H.
Non-Condensing
Supply line
Rating
+5 VDC
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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Appendix A – Troubleshooting
Appendix A - T roubleshooting
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.
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Appendix B – How To Get Assistance
Appendix B - How To Get Assistance
1. Read this manual thoroughly before attempting to install the
adapter in your system.
2. When calling for technical assistance, please have your user
manual and current adapter settings. If possible, please have the
adapter connected in a computer ready to run diagnostics.
3. Sealevel Systems provides an FAQ section on its web site. Please
refer to this for many commonly asked questions. This section can
be found at http://www.sealevel.com/faq.htm
4. Visit Sealevel’s website at www.sealevel.com
software updates and newest manuals.
5. Technical support is available Monday through Friday from 8:00
a.m. to 5:00 p.m. Eastern time. Technical support can be reached at
(864) 843-4343.
RETURN AUTHORIZATION MUST BE OBTAINED FROM
SEALEVEL SYSTEMS BEFORE RETURNED MERCHANDISE WILL
BE ACCEPTED. AUTHORIZATION CAN BE OBTAINED BY
CALLING SEALEVEL SYSTEMS AND REQUESTING A RETURN
MERCHANDISE AUTHORIZATION (RMA) NUMBER.
for the latest
Sealevel Systems SeaLINK+232I Page 9
Appendix C - Electrical Interface
Appendix C - Electrical Interface
RS-232
Quite possibly the most widely used communication standard is RS-232. This
implementation has been defined and revised several times and is often referred
to as RS-232 or EIA/TIA-232. The IBM PC computer defined the RS-232 port
on a 9 pin D sub connector and subsequently the EIA/TIA approved this
implementation as the EIA/TIA-574 standard. This standard is defined as the
9-Position Non-Synchronous Interface between Data Terminal Equipment and
Data Circuit-Terminating Equipment Employing Serial Binary Data
Interchange. Both implementations are in wide spread use and will be referred
to as RS-232 in this document. RS-232 is capable of operating at data rates up to
20 Kbps at distances less than 50 ft. The absolute maximum data rate may vary
due to line conditions and cable lengths. RS-232 is a single ended or unbalanced
interface, meaning that a single electrical signal is compared to a common signal
(ground) to determine binary logic states. The RS-232 and the EIA/TIA-574
specification define two types of interface circuits, Data Terminal Equipment
(DTE) and Data Circuit-Terminating Equipment (DCE). The SeaLINK+232I is
a DTE device.
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Appendix D – Ground Loop Phenomenon
Appendix D - Ground Loop Phenomenon
What is Ground Loop?
Ground loop Phenomenon occurs when two (or more) pieces of equipment are
connected together with a common ground and a different ground potential
exists at each location. This current can cause the connected equipment to
experience noise that in turn causes data transmission errors. In the extreme this
ground current can cause equipment malfunction or even destruction.
Cabling Recommendations
When connecting the SeaLINK+232I, care should be taken that both ends of
the connection are not isolated from ground (see Figure 1). This “floating”
ground condition could cause the capacitive or inductive coupling of voltages
that will cause a break down in the DC to DC converter circuit or in the optoisolator circuit. This condition will cause data erro rs and possibly destruction of
the receiver circuit.
TD
AB
Isolated
Adapter
Isolation
Barrier
RD
RTS
CTS
Ground
Non
Isolated
Adapter
Figure 1- SeaLINK+232I cabling example
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Appendix E - Asynchronous Communications
r
Appendix E - Asynchronous Communications
Serial data communications implies that individual bits of a character are
transmitted consecutively to a receiver that assembles the bits back into a
character. Data rate, error checking, handshaking, and character framing
(start/stop bits) are pre-defined and must correspond at both the transmitting and
receiving ends.
Asynchronous communications is the standard means of serial data
communication for PC compatibles and PS/2 computers. The original PC was
equipped with a communication or COM: port that was designed around an
8250 Universal Asynchronous Receiver Transmitter (UART). This device
allows asynchronous serial data to be transferred through a simple and
straightforward programming interface. Character boundaries for asynchronous
communications are defined by a starting bit followed by a pre-defined number
of data bits (5, 6, 7, or 8). The end of the character is defined by the
transmission of a pre-defined number of stop bits (usually 1, 1.5 or 2). An extra
bit used for error detection is often appended before the stop bits.
Idle state of
line
1
0
5 to 8 Data Bits
Figure 2 - Asynchronous Communications Bit Diagram
Odd, Even
or
Unused
P
BIT
STOP
Remain Idle o
next start bit
1
1.5
2
This special bit is called the parity bit. Parity is a simple method of determining
if a data bit has been lost or corrupted during transmission. There are several
methods for implementing a parity check to guard against data corruption.
Common methods are called (E)ven Parity or (O)dd Parity. Sometimes parity is
not used to detect errors on the data stream. This is refereed to as (N)o parity.
Because each bit in asynchronous communications is sent consecutively, it is
easy to generalize asynchronous communications by stating that each character
is wrapped (framed) by pre-defined bits to mark the beginning and end of the
serial transmission of the character. The data rate and communication
parameters for asynchronous communications have to be the same at both the
transmitting and receiving ends. The communication parameters are baud rate,
parity, number of data bits per character, and stop bits (i.e. 9600,N,8,1).
Sealevel Systems SeaLINK+232I Page 12
Appendix F – Silk Screen
Appendix F - Silk -Screen
2.09 in
3.28 in
1.39 in
Sealevel Systems SeaLINK+232I Page 13
Appendix G - Compliance Notices
Appendix G - Compliance Notices
Federal Communications Commission Statement
FCC - This equipment has been tested and found to comply with the limits for
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide 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. Operation of this equipment in a residential area is likely to
cause harmful interference. In such case the user will be required to correct the
interference at his own expense.
EMC Directive Statement
Products bearing the CE Label fulfill the requirements of
the EMC directive (89/336/EEC) and of the low-voltage
directive (73/23/EEC) issued by the European
Commission.
To obey these directives, the following European standards must be met:
EN55022 Class B - ‘Limits and methods of measurement of radio
EN60950 (IEC950) - ‘Safety of information technology
equipment, including electrical business equipment’
Always use cabling provided with this product if possible. If no cable is
provided or if an alternate cable is required, use high quality shielded cabling to
maintain compliance with EMC directives.
interference characteristics of information technology equipment’
EN55024-‘Information technology equipment Immunity
characteristics Limits and methods of measurement.
Sealevel Systems SeaLINK+232I Page 14
Warranty
Warranty
Sealevel Systems, Inc. provides a lifetime warranty for
this product. Should this product fail to be in good
working order at any time during this period, Sealevel
Systems will, at it's option, replace or repair it at no
additional charge except as set forth in the following terms. This warranty does
not apply to products damaged by misuse, modifications, accident or disaster.
Sealevel Systems assumes no liability for any damages, lost profits, lost savings
or any other incidental or consequential damage resulting from the use, misuse
of, or inability to use this product. Sealevel Systems will not be liable for any
claim made by any other related party.
RETURN AUTHORIZATION MUST BE OBTAINED FROM
SEALEVEL SYSTEMS BEFORE RETURNED MERCHANDISE WILL
BE ACCEPTED. AUTHORIZATION CAN BE OBTAINED BY
CALLING SEALEVEL SYSTEMS AND REQUESTING A RETURN
MERCHANDISE AUTHORIZATION (RMA) NUMBER.
Sealevel Systems, Incorporated
2779 Greenville Highway
P.O. Box 830
Liberty, SC 29657 USA
(864) 843-4343 FAX: (864) 843-3067
www.sealevel.com
email: support@sealevel.com
Technical Support is available from 8 a.m. to 5 p.m. Eastern time.
Monday - Friday
Trademarks
Sealevel Systems, Incorporated acknowledges that all trademarks referenced in
this manual are the service mark, trademark, or registered trademark of the
respective company.
SeaLINK+232I is a trademark of Sealevel Systems, Incorporated.
Sealevel Systems SeaLINK+232I Page 15
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