SeaLevel COMM+2 User manual

COMM+2

User Manual | 3083

Contents

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

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

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

CARD SETUP ........................................................................................................................................................5

INSTALLATION .................................................................................................................................................... 9

TECHNICAL DESCRIPTION ...............................................................................................................................11

SPECIFICATIONS ...............................................................................................................................................13

APPENDIX A – TROUBLESHOOTING................................................................................................................14

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

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

APPENDIX D - ASYNCHRONOUS COMMUNICATIONS....................................................................................18

APPENDIX E – SILK SCREEN ............................................................................................................................19

APPENDIX F – SCHEMATIC..............................................................................................................................20

APPENDIX G – COMPLIANCE NOTICES ..........................................................................................................21

WARRANTY ........................................................................................................................................................22

Introduction

Overview

The COMM+2 provides the PC with two async serial ports, which can interface, to RS-232, RS-422, or RS-

485.

Factory Default Settings

The COMM+2 factory default settings are as follows:

Port #

Base Address

IRQ

Electrical Specification

Port 1

3F8

RS-422

Port 2

2F8

RS-422

To install the COMM+2 using factory default settings, refer to Installation on page 6.

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

Port #

Base Address

IRQ

Electrical Specification

Before You Get Started

What’s Included

The COMM+2 is shipped with the following items. If any of these items are missing or damaged, contact

the supplier.

•COMM+2 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.

Card Setup

The COMM+2 contains several jumper straps, which must be set for proper operation.

Address Selection

Each port on the COMM+2 occupies 8 consecutive I/O locations. A DIP-switch is used to set the base

address for these locations. Be careful when selecting the base address as some selections conflict with

existing ports. The following table shows several examples that typically do not cause a conflict. SW1 sets

the I/O address for port 1 of the COMM+2 and SW2 sets the address for port 2.

Address

Binary

Switch Position Setting

Hex

A9 A0

280-287

1010000XXX

Off

2A0-2A7

1010100XXX

Off

2E8-2EF

1011101XXX

Off

2F8-2FF

1011111XXX

Off

3E8-3EF

1111101XXX

Off

300-307

1100000XXX

Off

328-32F

1100101XXX

Off

3F8-3FF

1111111XXX

Off

Figure 1 - Address Selection Table

The following illustration shows the correlation between the DIP-switch setting and the address bits used

to determine the base address. In the example below, address 300 Hex is selected as a base. Address 300

in binary is XX11 0000 0XXX where X = a non-selectable address bit.

Figure 2 - DIP-Switch Illustration

Setting the switch “On” or “Closed” corresponds to a “0” in the address, while leaving it “Off” or

“Open” corresponds to a “1”.

Refer to Appendix A for common address contentions.

Port Enable / Disable

Each port on the COMM+2 can be enabled or disabled with switch position 8 on the DIP-switch. The port is

enabled with the switch “On” or “Closed” and disabled when “Off” or “Open”. If any port is disabled, be sure

to disable the interrupt request for that port by removing the IRQ jumper.

IRQ Selection

Header E6 selects the interrupt request for each serial port. 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 3 - Header E6, IRQ Selection (Factory Default)

The actual Silk-Screen for the COMM+2 may have a “2” in place of the IRQ “2/9” selection.

Port 1

Port 2

Any two or more ports can share a common IRQ, provided a proper interrupt sharing driver is used, by

placing the jumpers on the same IRQ setting at header E6, and setting the appropriate selections at E5.

Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper.

Interrupt Modes

Jumper block E5 allows you to select a single interrupt per port mode or a shared interrupt mode. The single

interrupt per port mode is the typical DOS, O/S 2 and Windows 3.X mode of operation.

The shared interrupt mode, which allows more than one port to access a single IRQ, indicates the inclusion

of a 1K ohm pull-down resistor required on one port when sharing interrupts. This mode is used by software

that requires COM3: and COM4: to share interrupts with COM1: and COM2: (see note on E6) or in an OEM

configuration to support a specific software application.

Port 1 Port 2

Single Interrupt Mode

Port 1 Port 2

Shared Interrupt Mode

Figure 4 - Header E5, IRQ Mode Selection

Headers E2 & E4

These jumper blocks make the connection between the UART pins and the actual driver/receiver pair that

are used. If you are using the RS-232 driver/receiver pair, all eight of these jumpers will be in the “A” position.

If you are using the RS-422 driver/receiver pair all eight of these jumpers will be in the “B” position.

Headers E1 & E3

These jumper blocks allow you to customize your interface in the following ways:

•Select if Modem control signals are used or tied “True”.

•Select the RS-485 enable option.

•Select whether the Ground connection is a Direct Ground or a High Impedance Ground

through a 100-ohm resistor.

E1 & E3

1"A" Selects RS-232 Receive Data; "B" Selects RS-422 Receive Data

2"A" Enables CTS; Remove to set Active

3"A" Enables DSR; "B" sets DSR Active

4"A" Enables DCD; "B" sets DCD Active

5"A" Enables RI; "B" Sets RI Active

6"A" Also required to Enable CTS; "B" Sets CTS Active

7"B" sets RS-485 Driver Enabled by RTS; "A" RS-485 Driver always Enabled 8"A" Selects Direct Ground; "B"

A | B Selects 100 ohm High Impedance Ground

Figure 5 - Header E1 and E3, Interface Selection Options

E1 & E3 E2 & E4 E1 & E3 E2 & E4 E1 & E3 E2 & E4

Figure 6 - Interface Option Examples

RS-232

RS-422

RS-485

A | B A | B

Installation

Do not install the hardware until the software has been fully installed.

The COMM+2 can be installed in any ISA PC expansion slot. The COMM+2 contains several jumper straps

for each port, which 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 slot and remove the blank metal slot cover.

4. Gently insert the COMM+2 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.

Operating System Installation

For Windows Users

Only users running Windows 7 or newer should utilize these instructions for accessing and

installing the appropriate driver via Sealevel’s website. If you are utilizing an operating system

prior to Windows 7, please contact Sealevel by calling 864.843.4343 or emailing

[email protected] to receive access to the proper driver download and installation

instructions.

1. Begin by locating, selecting, and installing the correct software: SeaCOM Asynchronous

Serial Software.

2. Select “Download Now” for SeaCOM for Windows.

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

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

4. 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.

5. 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.

To avoid accidental damage, be sure to follow the proper ESD procedures by grounding yourself

and the board.

Other Operating Systems

Refer to the appropriate section of the Serial Utilities Software.

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