SeaLevel COMM+232.PCI Manual de usuario

COMM+232.PCI

User Manual | 7202

Contents

CONTENTS...........................................................................................................................................................2

INTRODUCTION ...................................................................................................................................................3

BEFORE YOU GET STARTED ...............................................................................................................................4

CARD SETUP ........................................................................................................................................................6

INSTALLATION .................................................................................................................................................... 8

HARDWARE INSTALLATION ............................................................................................................................... 9

TECHNICAL DESCRIPTION ...............................................................................................................................10

SPECIFICATIONS ...............................................................................................................................................12

APPENDIX A –TROUBLESHOOTING................................................................................................................13

APPENDIX B –HOW TO GET ASSISTANCE .....................................................................................................15

APPENDIX C –ELECTRICAL INTERFACE ........................................................................................................16

APPENDIX D –ASYNCHRONOUS COMMUNICATIONS ..................................................................................17

APPENDIX E –SILK SCREEN ............................................................................................................................18

APPENDIX F –COMPLIANCE NOTICES...........................................................................................................19

WARRANTY ........................................................................................................................................................21

Introduction

The Sealevel COMM+232.PCI is a two channel PCI Bus serial I/O adapter for the PC and compatibles. It

provides two RS-232 serial ports supporting data rates up to 460.8K bps.

The COMM+232.PCI works seamlessly with the standard operating system serial driver. UART upgrades

are available providing 32. 64 and 128 byte FIFOs.

Before You Get Started

What’s Included

The COMM+232.PCI is shipped with the following items. If any of these items are missing or damaged,

please contact Sealevel for replacement.

•COMM+232.PCI 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 COMM+232.PCI factory default settings are as follows:

Port #

Clock Mode

Port 1

DIV4

Port 2

DIV4

To install the COMM+232.PCI using factory default settings, refer to Installation.

For your reference, record installed ULTRA COMM+2.PCI settings below:

Port #

Clock Mode

Port 1

Port 2

Card Setup

Address and IRQ Selection

The COMM+232.PCI is automatically assigned I/O addresses and IRQs by your motherboard BIOS. Only

the user may modify the I/O address.

Adding or removing other hardware may change the assignment of I/O addresses and IRQs.

Clock Modes

The COMM+232.PCI employs a unique clocking option that allows the end user to select from divide by 4

and divide by 1 clocking modes. These modes are selected at Headers E1 and E2.

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) position.

DIV1

DIV4

DIV1

E1 E2

Figure 1 - Clocking Mode 'Divide By 4’

To select the maximum data rate (460.8K bps) place the jumper in the divide by 1 (silk-screen DIV1) position.

DIV1

DIV4

DIV1

E1 E2

Figure 2 - Clocking Mode 'Divide By 1’

Baud Rates and Divisors for the ‘DIV1’ Mode

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

14.4K bps

115.2 K bps

28.8K 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

9600 bps

19.2K bps

38.4K bps

57.6K bps

115.2K bps

230.4K bps

460.8K bps

Installation

Software Installation

Microsoft Windows XP/Vista/Windows 7™ Operating Systems

Do not install the adapter until the software has been successfully installed.

1. Begin by locating, selecting, and installing the correct software (SeaCOM Software) from the

Sealevel’s software database: Sealevel Driver Downloads & Software.Select SeaCOM

software for Windows. Select SeaCOM for Windows v3.7.5 in Downloads.

2. The setup files will automatically detect the operating environment and install the proper

components. Follow the information presented on the screens that follow.

3. A screen may appear with text similar to: “The publisher cannot be determined due to the

problems below: Authenticode signature not found.” Please click 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.

4. During setup, the user 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 also included to remove all

registry/INI file entries from the system.

5. The software is now installed, and you can proceed with the hardware installation.

Other Operating Systems

Refer to the appropriate section of the Serial Utilities Software.

LINUX INSTALLATION

Refer to the Linux Archives - Sealevel. This link contains valuable information on installing your serial

adapter in the various Linux releases. Also included is a series of files explaining proper Linux syntax and

typical Linux serial implementations.

QNX

For the most up to date information on the QNX4 and QNX6 software support, please call Sealevel Systems’

Technical Support, (864) 843-4343. Our technical support is free and available from 8:00AM-5PM Eastern

Time, Monday through Friday. For email support contact: support@sealevel.com.

Hardware Installation

The COMM+232.PCI can be installed in any of the PCI expansion slots and contains several jumper straps

for each port that must be set for proper operation.

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

2. Remove the PC case cover.

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

4. Gently insert the COMM+232.PCI 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

The Sealevel Systems COMM+232.PCI provides a PCI interface adapter with 2 asynchronous serial ports

providing a versatile interface for modems, printers, and plotters.

The COMM+232.PCI utilizes the 16550 UART. This chip features programmable baud rates, data format,

interrupt control and a 16-byte input and output FIFO. A full array of advanced UARTS is also available for

this card. Contact Sealevel Systems for more information.

Interrupts

A good description of an interrupt and its importance to the PC can be found in the book ‘Peter Norton’s

Inside the PC, Premier Edition’:

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 performed. 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 its own interrupt, frequently called

an IRQ (short for Interrupt ReQuest).

In these early days of PC’s 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 throughput

abilities this method of servicing shared IRQs became inefficient.

Why use an ISP?

The answer to the polling inefficiency is the Interrupt Status Port (ISP). The ISP is a read only 8-bit register

that sets a corresponding bit when an interrupt is pending. Port 1 interrupt line corresponds with Bit D0 of

the status port, Port 2 with D1 etc. The use of this port means that the software designer now only has to

poll a single port to determine if an interrupt is pending.

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