SeaLevel DuoCom User manual

DUOCOM™

User Manual

Part #3088

Sealevel Systems, Inc. Telephone: (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

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 PIN ASSIGNMENTS (DB9 MALE) ................................7

SPECIFICATIONS ...................................................................... 8

ENVIRONMENTAL SPECIFICATIONS .................................................8

MANUFACTURING...........................................................................8

POWER CONSUMPTION ...................................................................8

MEAN TIME BETWEEN FAILURES (MTBF) .....................................8

PHYSICAL 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

SL9141 Revision 7/2006

Introduction

Sealevel Systems DUOCOM: Page 1

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

• Sealevel Software

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 on

page 6.

For your reference, record installed DUOCOM: settings below:

Port # Base Address IRQ

Port 1

Port 2

Card Setup

Sealevel Systems DUOCOM: Page 2

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

Port2

SW1

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

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.

Card Setup

Sealevel Systems DUOCOM: Page 3

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.

11 12 1

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.

Card Setup

Sealevel Systems DUOCOM: Page 4

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.

NS R

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.

NS R

Figure 4 - Header E3, Shared IRQ Mode

Card Setup

Sealevel Systems DUOCOM: Page 5

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.

NS R

Figure 5 - Header E3, Sharing IRQ’s with another adapter

Technical Description

Sealevel Systems DUOCOM: Page 6

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. 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.

Technical Description

Sealevel Systems DUOCOM: Page 7

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)

Name Pin # Mode

TD Transmit Data 3 Output

RTS Request To Send 7 Output

DTR Data Term Ready 4 Output

GND Ground 5

RD Receive Data 2 Input

DCD Data Carrier Detect 1 Input

DSR Data Set Ready 6 Input

CTS Clear To Send 8 Input

RI Ring Indicator 9 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.

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