TM
DUOCOM:
USER MANUAL
Part # 3088
Sealevel Systems, Inc
155 Technology Place
P.O. Box 830
Liberty, SC 29657 USA
Phone: (864) 843-4343
FAX:
(864) 843-3067
www.sealevel.com
Contents
INTRODUCTION ........................................................................ 1
OVERVIEW ...........................................................................................1
WHAT’S INCLUDED..............................................................................1
FACTORY DEFAULT SETTINGS..............................................................1
CARD SETUP............................................................................. 2
ADDRESS SELECTION............................................................................2
IRQ SELECTION ...................................................................................3
INTERRUPT MODES ..............................................................................4
INSTALLATION.......................................................................... 6
OPERATING SYSTEM INSTALLATION ....................................................6
For Windows Users .......................................................................6
Other Operating Systems ..............................................................6
SYSTEM INSTALLATION .......................................................................6
TECHNICAL DESCRIPTION ....................................................... 7
FEATURES ............................................................................................7
CONNECTOR P IN ASSIGNMENTS (DB9 MALE).....................................7
SPECIFICATIONS ....................................................................... 8
ENVIRONMENTAL SPECIFICATIONS.......................................................8
MANUFACTURING................................................................................8
P OWER CONSUMPTION ........................................................................8
MEAN TIME BETWEEN FAILURES (MTBF) ..........................................8
P HYSICAL DIMENSIONS........................................................................8
APPENDIX A - TROUBLESHOOTING ......................................... 9
APPENDIX B - HOW TO GET ASSISTANCE ............................. 11
APPENDIX C - ELECTRICAL INTERFACE ................................ 12
RS-232.............................................................................................12
APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ............ 13
APPENDIX E - SILK-SCREEN .................................................. 14
APPENDIX F - COMPLIANCE NOTICES ................................... 15
FEDERAL COMMUNICATIONS COMMISSION STATEMENT ...................15
CANADIAN RADIO INTERFERENCE REGULATIONS ..............................15
EMC DIRECTIVE STATEMENT ...........................................................16
WARRANTY ............................................................................ 17
Figure 1 - Address Selection Table.................................................................. 2
Figure 2 - Header E1 and E2, IRQ Selection.................................................. 3
Figure 3 - Header E3, Normal IRQ Mode ...................................................... 4
Figure 4 - Header E3, Shared IRQ Mode ....................................................... 4
Figure 5 - Header E3, Sharing IRQ’s with another adapter.......................... 5
Figure 6 - Asynchronous Communications Bit Diagram............................... 13
© 1999g Sealevel Systems, Incorporated. All rights reserved.
Introduction
Introduction
Overview
The Sealevel Systems DUOCOM: provides the PC with 2 Asynchronous serial
ports providing a versatile interface for common RS-232 needs (i.e. modem,
mouse and plotters).
What’s Included
The DUOCOM: is shipped with the following items. If any of these items are
missing or damaged, contact the supplier.
•
•
•
DUOCOM: Serial I/O Adapter
Serial Utility Software
User Manual
Factory Default Settings
The DUOCOM: factory default settings are as follows:
Port #
Port 1
Port 2
Base Address
280
288
IRQ
5
10
To install the DUOCOM: using factory default settings, refer to Installation on
page 6.
For your reference, record installed DUOCOM: settings below:
Port #
Port 1
Port 2
Sealevel Systems DUOCOM:
Base Address
IRQ
Page 1
Card Setup
Card Setup
The DUOCOM: contains several jumper straps which must be set for proper
operation.
Address Selection
Each serial port on the DUOCOM: occupies eight consecutive I/O locations,
and looks to the PC as a standard serial port. A DIP switch (SW1) is used to set
the port address options for the DUOCOM:. Be careful when selecting the port
addresses as some selections may conflict with existing ports. The following
table shows the addressing options available with the standard PAL. If you do
not see an address option that suits your needs, please contact Sealevel
Systems Technical Support about a custom PAL option.
Port1
J2
3F8
3E8
2F8
2F8
3220
4220
5220
5220
280
300
310
280
290
300
Disabled
Port2
J3
2F8
2E8
2E8
3E8
3228
4228
5228
4220
290
308
318
288
298
280
Disabled
SW1
1
On
On
On
On
On
On
On
Off
Off
Off
Off
Off
Off
Off
Off
SW1
2
On
On
On
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
SW1
3
On
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
SW1
4
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
Figure 1 - Address Selection Table
Note: Each COM: port in your system should have a unique address. Typically
COM1: - COM4: addresses are 3F8, 2F8, 3E8 & 2E8 Hex. If a COM1:
& COM2: are already present, use the second addressing option, this
will provide the typical addresses for COM3: & COM4: .
Refer to Appendix A for common address contentions.
Sealevel Systems DUOCOM:
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Card Setup
IRQ Selection
Headers E1 and E2 select the interrupt request for each serial port (E1 - Port 1,
E2 - Port 2). If COM1: is selected, the corresponding jumper must be on the
IRQ4 setting. If COM2: is selected, the corresponding jumper must be on
IRQ3.
Note: Most communications software applications default COM3: to IRQ4 and
COM4: to IRQ3. This requires the sharing of interrupts between COM1:
and COM3:, and between COM2: and COM4:. While this is the default,
it is not always the preferred setting. Check your software configuration
instructions to determine the most appropriate IRQ selection.
E1
2/9 3 4 5 7 10 11 12 15
E2
2/9 3 4 5 7 10 11 12 15
Figure 2 - Header E1 and E2, IRQ Selection
Any two or more ports can share a common IRQ by placing the jumpers on the
same IRQ setting, and setting the appropriate selections at E3. Consult your
particular software for IRQ selection. If no interrupt is desired, remove the
jumper.
Sealevel Systems DUOCOM:
Page 3
Card Setup
Interrupt Modes
Header E3 selects the interrupt mode for each port. Each port must be set in
the correct mode to insure proper installation.
‘N’ indicates the (N)ormal, single interrupt per port mode. ‘S’ Indicates the
(S)hared interrupt mode, which allows more than one port to access a single
IRQ. Any two or more ports can share a common IRQ by placing the jumpers
on the same IRQ setting, and setting the appropriate selections at E1. Consult
your particular software for IRQ selection. If no interrupt is desired, remove
the jumper. ‘R’ indicates the inclusion of a 1K ohm pull-down resistor
required on one port when sharing interrupts.
N S
R
1
E3 2
Figure 3 - Header E3, Normal IRQ Mode
Set the jumpers to ‘S’ for shared interrupt mode on all blocks sharing an IRQ.
Also set one block for ‘R’. This provides the pull-down resistor circuit that
makes sharing of IRQs possible. If you are using more than one DUOCOM: or
a compatible adapter in a bus you should only have one port set to ‘R’. The
following example shows both ports sharing a single IRQ.
N S
R
1
E3 2
Figure 4 - Header E3, Shared IRQ Mode
Sealevel Systems DUOCOM:
Page 4
Card Setup
Set the jumper to ‘S’ if you are using more than one DUOCOM: in a bus or you
wish to completely remove the pull-down resistor for hardware compatibility.
Setting the adapter in this configuration when it is not accompanied by a pulldown resistor will prevent the ports from triggering an interrupt.
N S
E3
R
1
2
Figure 5 - Header E3, Sharing IRQ’s with another adapter
Sealevel Systems DUOCOM:
Page 5
Technical Description
Installation
Operating System Installation
For Windows Users
Start by choosing Install Software at the beginning of the CD. Choose
Asynchronous COM: Port Software, SeaCOM.
Other Operating Systems
Refer to the appropriate section of the Serial Utilities Software.
System Installation
The DUOCOM: can be installed in any of the PC expansion slots, but to access
the ‘AT’ or (E)ISA IRQs (10 - 15) it must be installed in one of the 16 bit slots.
The DUOCOM: contains several jumper straps for each port which must be set
for proper operation prior to installing the adapter into the computer.
1.
2.
3.
4.
Turn off PC power. Disconnect the power cord.
Remove the PC case cover.
Locate an available slot and remove the blank metal slot cover.
Gently insert the DUOCOM: into the slot. Make sure that the adapter is
seated properly.
5. Replace the screw.
6. Replace the cover.
7. Connect the power cord.
Installation is complete.
Sealevel Systems DUOCOM:
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Technical Description
Technical Description
The DUOCOM: utilizes the 16550 UART. This chip features programmable
baud rate, data format, interrupt control and a 16 byte input and output FIFO.
Also available as an option is the 16C650 UART that provides a deeper FIFO
(32 bytes) and enhanced clocking features.
Features
•
Addressable as COM1: - COM4: and other selectable address
combinations.
•
‘Shareable’ IRQs allow more than one port to share a single IRQ.
•
IRQs 2-5, 7, 10, 11, 12, 15 supported.
Connector Pin Assignments (DB9 Male)
TD
RTS
DTR
GND
RD
DCD
DSR
CTS
RI
Name
Transmit Data
Request To Send
Data Term Ready
Ground
Receive Data
Data Carrier Detect
Data Set Ready
Clear To Send
Ring Indicator
Pin #
3
7
4
5
2
1
6
8
9
Mode
Output
Output
Output
Input
Input
Input
Input
Input
Note: These assignments meet EIA/TIA/ANSI-574 DTE for DB-9 type
connectors.
Technical Note: Please terminate any control signals that are not going to be
used. The most common way to do this is connect RTS to CTS and RI. Also,
connect DCD to DTR and DSR. Terminating these pins, if not used, will help
insure you get the best performance from your adapter.
Sealevel Systems DUOCOM:
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Specifications
Specifications
Environmental Specifications
Specification
Temperature Range
Humidity Range
Operating
0º to 50º C
(32º to 122º F)
10 to 90% R.H.
Non-Condensing
Storage
-20º to 70º C
(-4º to 158º F)
10 to 90% R.H.
Non-Condensing
Manufacturing
•
All Sealevel Systems Printed Circuit boards are built to U.L. 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
Rating
+12 VDC
50 mA
-12 VDC
50 mA
+5 VDC
195 mA
Mean Time Between Failures (MTBF)
Greater than 150,000 hours. (Calculated)
Physical Dimensions
Board length
Board Height including Goldfingers
Board Height excluding Goldfingers
Sealevel Systems DUOCOM:
5.4 inches
3.5 inches
3.2 inches
(13.72 cm)
(8.89 cm)
(8.13 cm)
Page 8
Appendix A - Troubleshooting
Appendix A - Troubleshooting
Serial Utility test software is supplied with the Sealevel Systems adapter and
will be used in the troubleshooting procedures. By using this software and
following these simple steps, most common problems can be eliminated
without the need to call Technical Support.
1. Identify all I/O adapters currently installed in your system. This includes
your on-board serial ports, controller cards, sound cards etc. The I/O
addresses used by these adapters, as well as the IRQ (if any) should be
identified.
2. Configure your Sealevel Systems adapter so that there is no conflict with
currently installed adapters. No two adapters can occupy the same I/O
address.
3. Make sure the Sealevel Systems adapter is using a unique IRQ The IRQ is
typically selected via an on-board header block. Refer to the section on
Card Setup for help in choosing an I/O address and IRQ.
4. Make sure the Sealevel Systems adapter is securely installed in a
motherboard slot.
5. When running DOS, Windows 3.x or other operating systems refer to the
Serial Utilities software for that operating system and the User Manual to
verify that the Sealevel Systems adapter is configured correctly. The
supplied software contains a diagnostic program 'SSD' that runs under DOS
and will verify if an adapter is configured properly. This diagnostic
program is written with the user in mind and is easy to use. Refer to the
DIAG.txt file in the dos\diag directory for detailed instructions on using
'SSD'.
6. For Windows 95/98 and Windows NT, the diagnostic tool 'WinSSD' is
installed in the Sealevel folder on the Start Menu during the setup process.
First find the ports using the Device Manager, then use 'WinSSD' to verify
that the ports are functional.
7. Always use the Sealevel Systems diagnostic software when
troubleshooting a problem. This will help eliminate any software issues
and identify any hardware conflicts.
Sealevel Systems DUOCOM:
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Appendix A - Troubleshooting
8. The following are known I/O conflicts:
•
•
•
•
•
•
The 278 and 378 settings may conflict with your printer I/O adapter.
3B0 cannot be used if a Monochrome adapter is installed.
3F8-3FF is typically reserved for COM1:
2F8-2FF is typically reserved for COM2:
3E8-3EF is typically reserved for COM3:
2E8-2EF is typically reserved for COM4:
Sealevel Systems DUOCOM:
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Appendix B - How To Get Assistance
Appendix B - How To Get Assistance
Please refer to Appendix A - Troubleshooting prior to calling Technical
Support.
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 installed in a computer ready to run diagnostics.
3. Sealevel Systems maintains a Home page on the Internet. Our
home page address is www.sealevel.com. The latest software
updates, and newest manuals are available via our FTP site that can
be accessed from our home page.
4. Technical support is available Monday to 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.
Sealevel Systems DUOCOM:
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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 DUOCOM: is a DTE device.
Sealevel Systems DUOCOM:
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Appendix D - Asynchronous Communications
Appendix D - 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
Odd, Even
5 to 8 Data Bits
or
Unused
Remain Idle or
next start bit
1
P
BIT
STOP
0
1
1.5
2
Figure 6 - Asynchronous Communications Bit Diagram
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 DUOCOM:
Page 13
Appendix E - Silk-Screen
Appendix E - Silk-Screen
3.9"
5.0"
4.2"
Sealevel Systems DUOCOM:
Page 14
Appendix F - Compliance Notices
Appendix F - Compliance Notices
Federal Communications Commission Statement
This equipment has been tested and found to comply with the limits for Class B
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 residential installation. 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. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna
• Increase the separation between the equipment and receiver
• Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected
• Consult the dealer or an experienced radio/TV technician for help
Caution
Sealevel Systems, Inc. is not responsible for any radio or television
interference caused by unauthorized modifications of this equipment or the
substitution of attachment of connecting cables and equipment other than those
specified by Sealevel Systems. Such unauthorized modifications, substitutions,
or attachments may void the user’s authority to operate the equipment. The
correction of interference caused by such unauthorized modifications,
substitutions, or attachments will be the responsibility of the user.
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 FCC directives.
Canadian Radio Interference Regulations
This Class B digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.
Cet Appareil numérique de la classe B respecte toutes les exigences de
Règlement sur le matériel du Canada
Sealevel Systems DUOCOM:
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Appendix F - Compliance Notices
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
interference characteristics of information technology equipment’
EN55024-‘Information
technology
equipment
characteristics Limits and methods of measurement.ry
Immunity
EN60950 (IEC950) - ‘Safety of information
equipment, including electrical business equipment’
technology
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.
Sealevel Systems DUOCOM:
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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
155 Technology Place
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.
DUOCOM: is a trademark of Sealevel Systems, Incorporated.
Sealevel Systems DUOCOM:
Page 17
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