SeaLevel DUOCOM 3088 User manual

DUOCOM™
User Manual | 3088

Contents
CONTENTS...........................................................................................................................................................2
INTRODUCTION ...................................................................................................................................................3
BEFORE YOU GET STARTED ...............................................................................................................................4
CARD SETUP ........................................................................................................................................................6
SOFTWARE INSTALLATION ................................................................................................................................9
HARDWARE INSTALLATION .............................................................................................................................10
TECHNICAL DESCRIPTION ...............................................................................................................................11
SPECIFICATIONS ...............................................................................................................................................12
APPENDIX A –TROUBLESHOOTING................................................................................................................13
APPENDIX B –HOW TO GET ASSISTANCE .....................................................................................................14
APPENDIX C –ELECTRICAL INTERFACE ........................................................................................................15
APPENDIX D –ASYNCHRONOUS COMMUNICATIONS ..................................................................................16
APPENDIX E –SILK-SCREEN ............................................................................................................................17
APPENDIX F –COMPLIANCE NOTICES...........................................................................................................18
WARRANTY ........................................................................................................................................................20

Introduction
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).

Before You Get Started
What’s Included
The DUOCOM is shipped with the following items. If any of these items are missing or damaged, please
contact Sealevel for replacement.
•DUOCOM Serial I/O Adapter
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.

Factory Default Settings
The DUOCOM factory default settings are as follows:
Port #
Base Address
IRQ
Port 1
280
5
Port 2
288
10
To install the DUOCOM using factory default settings, refer to Installation.
For your reference, record installed DUOCOM settings below:
Port #
Base Address
IRQ

Card Setup
The DUOCOM contains several jumper straps that 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
Port2
J3
SW1
1
SW1
2
SW1
3
SW1
4
3F8
2F8
On
On
On
Off
3E8
2E8
On
On
Off
On
2F8
2E8
On
On
Off
Off
2F8
3E8
On
Off
On
On
3220
3228
On
Off
On
Off
4220
4228
On
Off
Off
On
5220
5228
On
Off
Off
Off
5220
4220
Off
On
On
On
280
290
Off
On
On
Off
300
308
Off
On
Off
On
310
318
Off
On
Off
Off
280
288
Off
Off
On
On
290
298
Off
Off
On
Off
300
280
Off
Off
Off
On
Disabled
Disabled
Off
Off
Off
Off
Figure 1 - Address Selection Table
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.

Card Setup, Continuing
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.
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.
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.
2/9 3 4 5 7 10 11 12 15
2/9 3 4 5 7 10 11 12 15
E2
E1

Card Setup, Continuing
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.
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.
Figure 4 - Header E3, Shared IRQ Mode
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 pull-down resistor will prevent the ports from triggering an interrupt.
Figure 5 - Header E3, Sharing IRQ’s with another adapter
1
2
E3
N S R
E3
N S R
1
2
E3
N S R
1
2

Software Installation
Operating System Installation
Do not install the adapter in the machine until the software has been fully installed.
For Windows Users
Begin by locating, selecting, and installing the correct software from the Sealevel software driver database.
1. Select the Part Number (3088) for your device from the listing.
2. Click ‘Download Now’ for the version of SeaCOM compatible with your system.
3. The setup file will automatically detect the operating environment and install the proper
components. Follow the information presented on the installation screens that follow.
4. 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.
5. 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.
6. Proceed with the physical installation of your SeaLINK USB serial adapter.
Windows NT is not USB aware and thus cannot support this device.

Hardware 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. Turn off PC power. Disconnect the power cord.
2. Remove the PC case cover.
3. Locate an available slot and remove the blank metal slot cover.
4. 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.