SeaLevel COMM+4.PCI Manuel utilisateur

Part # 7401

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

VERSA COMM+4.PCI

USER MANUAL

Contents

INTRODUCTION ........................................................................ 1

OVERVIEW ...........................................................................................1

WHAT’S INCLUDED..............................................................................1

CARD SETUP............................................................................. 2

CLOCK MODES.....................................................................................2

BAUD RATES AND DIVISORS FOR THE ‘DIV1’ MODE............................3

BAUD RATES AND DIVISORS FOR THE ‘DIV2’ MODE............................4

ADDRESS AND IRQ SELECTION.............................................................4

INSTALLATION.......................................................................... 5

OPERATING SYSTEM INSTALLATION ....................................................5

For Windows Users.......................................................................5

Other Operating Systems ..............................................................5

SYSTEM INSTALLATION .......................................................................5

TECHNICAL DESCRIPTION ....................................................... 6

INTERRUPTS.........................................................................................6

WHY USE AN ISP?...............................................................................7

CONNECTOR PIN ASSIGNMENTS...........................................................7

DB-25 (RS-232 DTE) (DB-25 MALE)....................................7

DB-9 (EIA-574 DTE) (DB-9 MALE)......................................8

DB-37 (DB-37 MALE).............................................................8

SPECIFICATIONS....................................................................... 9

ENVIRONMENTAL SPECIFICATIONS.......................................................9

POWER CONSUMPTION........................................................................9

MEAN TIME BETWEEN FAILURES (MTBF)..........................................9

PHYSICAL DIMENSIONS........................................................................9

APPENDIX A -TROUBLESHOOTING....................................... 10

PCI COM NUMBER SELECTION IN WINDOWS 95/98.........11

APPENDIX B -HOW TO GET ASSISTANCE............................. 12

APPENDIX C -ELECTRICAL INTERFACE................................ 13

RS-232.............................................................................................13

APPENDIX D -ASYNCHRONOUS COMMUNICATIONS ............ 14

APPENDIX E -SILK-SCREEN.................................................. 15

APPENDIX F -COMPLIANCE NOTICES ................................... 16

FEDERAL COMMUNICATIONS COMMISSION STATEMENT...................16

EMC DIRECTIVE STATEMENT ...........................................................16

WARRANTY............................................................................ 17

Figures

Figure 1 -Clocking Mode ‘Divide By 4’.........................................................2

Figure 2 -Clocking Mode ‘Divide By 2’.........................................................2

Figure 3 -Clocking Mode ‘Divide By 1’.........................................................2

Figure 4 -Asynchronous Communications Bit Diagram...............................14

Introduction

Sealevel Systems VERSA COMM+4.PCI Page 1

Introduction

Overview

The Sealevel Systems VERSA COMM+4.PCI provides the PC with four

RS-232 asynchronous ports. The VERSA COMM+4.PCI allows for connection

to any device utilizing the RS-232 electrical interface, such as modems,

data-entry terminals, and plotters.

What’s Included

The VERSA COMM+4.PCI is shipped with the following items. If any of these

items are missing or damaged, contact the supplier.

•VERSA COMM+4.PCI Serial I/O Adapter

•DB-37 to four DB-25 ‘Spider Cable’ (DB-9 Spider Cable is

available)

•Serial Utility Software

•User Manual

Card Setup

Sealevel Systems VERSA COMM+4.PCI Page 2

Card Setup

Clock Modes

The VERSA COMM+4.PCI employs a unique clocking option that allows the

end user to select from divide by 4, divide by 2 and divide by 1 clocking modes.

This mode is selected at J5.

To select the Baud rates commonly associated with COM: ports (i.e. 2400,

4800, 9600, 19.2, … 115.2K Bps) place the jumper in the divide by 4 mode

(silk-screen DIV4).

DIV1

DIV2

DIV4

Figure 1-Clocking Mode ‘Divide By 4’

To double these rates up to a maximum rate for 230.4K bps place the jumper in

the divide by 2 (silk-screen DIV2) position.

DIV1

DIV2

DIV4

Figure 2-Clocking Mode ‘Divide By 2’

To select the maximum data rate (460.8K bps) place the jumper in the divide by

1 (silk-screen DIV1) position.

DIV1

DIV2

DIV4

Figure 3-Clocking Mode ‘Divide By 1’

Card Setup

Sealevel Systems VERSA COMM+4.PCI Page 3

Baud Rates and Divisors for the ‘Div1’ mode

The following table shows some common data rates and the rates you should

choose to match them if using the adapter in the ‘Div1’ mode.

For this Data Rate Choose this Data Rate

1200 bps 300 bps

2400 bps 600 bps

4800 bps 1200 bps

9600 bps 2400 bps

19.2K bps 4800 bps

57.6 K bps 9600 bps

115.2 K bps 19.2K bps

230.4K bps 57.6 K bps

460.8K bps 115.2 K bps

If your communications package allows the use of Baud rate divisors, choose

the appropriate divisor from the following table:

For this Data Rate Choose this Divisor

1200 bps 384

2400 bps 192

4800 bps 96

9600 bps 48

19.2K bps 24

38.4K bps 12

57.6K bps 8

115.2K bps 4

230.4K bps 2

460.8K bps 1

Card Setup

Sealevel Systems VERSA COMM+4.PCI Page 4

Baud Rates and Divisors for the ‘Div2’ mode

The following table shows some common data rates and the rates you should

choose to match them if using the adapter in the ‘Div2’ mode.

For this Data Rate Choose this Data Rate

1200 bps 600 bps

2400 bps 1200 bps

4800 bps 2400bps

9600 bps 4800 bps

19.2K bps 9600 bps

38.4K bps 19.2K bps

57.6 K bps 38.4K bps

115.2 K bps 57.6 K bps

230.4 K bps 115.2 K bps

If your communications package allows the use of Baud rate divisors, choose

the appropriate divisor from the following table:

For this Data Rate Choose this Divisor

1200 bps 192

2400 bps 96

4800 bps 48

9600 bps 24

19.2K bps 12

38.4K bps 8

57.6K bps 4

115.2K bps 2

230.4K bps 1

Address and IRQ selection

The VERSA COMM+4.PCI is automatically assigned I/O addresses and IRQs

by your motherboard BIOS. Only the I/O address may be modified by the user.

Adding or removing other hardware may change the assignment of I/O

addresses and IRQs.

Installation

Sealevel Systems VERSA COMM+4.PCI Page 5

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 VERSA COMM+4.PCI can be installed in any of the PCI expansion slots

and contains a single jumper strap that must be set for proper operation. Please

see the Card Setup section of the manual for information on this jumper.

1. When running Windows 9x/NT install software before installing adapter.

2. Turn off PC power. Disconnect the power cord.

3. Remove the PC case cover.

4. Locate an available PCI slot and remove the blank metal slot cover.

5. Gently insert the VERSA COMM+4.PCI into the slot. Make sure that the

adapter is seated properly.

6. Replace the screw.

7. Replace the cover.

8. Connect the power cord.

Installation is complete.

Technical Description

Sealevel Systems VERSA COMM+4.PCI Page 6

Technical Description

The VERSA COMM+4.PCI utilizes the 16C554 UART. This chip features

programmable baud rate, data format, interrupt control and a 16-byte input and

output FIFO, and is functionally 4 16C550 UARTs. The 16C654 UART is also

available on this card, which has a 64-byte FIFO as opposed to the 16-byte

FIFO available in the 16C554.

Interrupts

A good description of an interrupt and its importance to the IBM PC can be

found in the book ‘Peter Norton’s Inside the PC, Premier Edition’:

“ One of the key things that makes a computer different from any other kind of

man-made machine is that computers have the capability to respond to the

unpredictable variety of work that comes to them. The key to this capability is a

feature known as interrupts. The interrupt feature enables the computer to

suspend whatever it is doing and switch to something else in response to an

interruption, such as the press of a key on the keyboard.”

A good analogy of a PC interrupt would be the phone ringing. The phone ‘bell’

is a request for us to stop what we are currently doing and take up another task

(speak to the person on the other end of the line). This is the same process the

PC uses to alert the CPU that a task must be preformed. The CPU upon

receiving an interrupt makes a record of what the processor was doing at the

time and stores this information on the ‘stack’; this allows the processor to

resume its predefined duties after the interrupt is handled, exactly where it left

off. Every main sub-system in the PC has it’s own interrupt, frequently called

an IRQ (short for Interrupt ReQuest). The following IRQ table will define the

system IRQs as well as show typically free IRQs.

In these early days of PCs Sealevel Systems decided that the ability to share

IRQs was an important feature for any add-in I/O card. Consider that in the IBM

XT the available IRQs were IRQ0 through IRQ7. Of these interrupts only IRQ2-

5 and IRQ7 were actually available for use. This made the IRQ a very valuable

system resource. To make the maximum use of these system resources

Sealevel Systems devised an IRQ sharing circuit that allowed more than one

port to use a selected IRQ. This worked fine as a hardware solution but

presented the software designer with a challenge to identify the source of the

interrupt. The software designer frequently used a technique referred to as

‘round robin polling’. This method required the interrupt service routine to

‘poll’ or interrogate each UART as to its interrupt pending status. This method

of polling was sufficient for use with slower speed communications, but as

modems increased their through put abilities this method of servicing shared

IRQs became inefficient.

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