SeaLevel DUAL SIO 3082 Manual de usuario

Sealevel Systems, Inc.

155 Technology Place

P.O. Box 830

Liberty, SC 29657 USA

Phone: (864) 843-4343

FAX: (864) 843-3067

DUAL SIO

USER MANUAL

www.sealevel.com

Contents

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

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

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

FACTORY DEFAULT SETTINGS..............................................................1

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

ADDRESS SELECTION............................................................................2

PORT ENABLE / DISABLE.....................................................................3

IRQ SELECTION...................................................................................3

RTS ENABLE FOR RS-485..................................................................4

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

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

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

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

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

FEATURES............................................................................................6

LINE TERMINATION..............................................................................6

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

RS-422 (DB 9 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-422.............................................................................................12

RS-485.............................................................................................12

APPENDIX D -ASYNCHRONOUS COMMUNICATIONS ............ 13

APPENDIX E -SILK-SCREEN.................................................. 14

APPENDIX F -SCHEMATIC..................................................... 15

APPENDIX G -COMPLIANCE NOTICES .................................. 16

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

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

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

Trademarks ...................................................................................17

Figures

Figure 1 -Address Selection Table..................................................................2

Figure 2 -DIP-Switch Illustration....................................................................2

Figure 3 -Header E6, IRQ Selection..............................................................3

Figure 4 -Header E3 and E4, RS-485 Enable.................................................4

Figure 5 -Asynchronous Communications Bit Diagram...............................13

Introduction

Sealevel Systems Dual SIO Page 1

Introduction

Overview

The Dual SIO provides the PC with two asynchronous serial ports which

can interface to RS-422 or RS-485 devices.

What’s Included

The Dual SIO is shipped with the following items. If any of these items

are missing or damaged, contact the supplier.

•Dual SIO Serial I/O Adapter

•Serial Utility Software

•User Manual

Factory Default Settings

The Dual SIO factory default settings are as follows:

Port # Base Address IRQ Electrical Specification

Port 1 3F8 4RS-422

Port 2 2F8 3RS-422

To install the Dual SIO using factory default settings, refer to the section

on Installationin this manual.

For your reference, record installed Dual SIOsettings below:

Port # Base Address IRQ Electrical Specification

Card Setup

Sealevel Systems Dual SIO Page 2

Card Setup

The Dual SIO contains several jumper straps which must be set for proper

operation.

Address Selection

Each port on the Dual SIO 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. S1 sets the I/O address for port 1 of the Dual SIO and S2

sets the address for port 2.

Address Binary Switch Position Setting

Hex A9 A0 1234567

280-287 1010000XXX Off On Off On On On On

2A0-2A7 1010100XXX Off On Off On Off On On

2E8-2EF 1011101XXX Off On Off Off Off On Off

2F8-2FF 1011111XXX Off On Off Off Off Off Off

3E8-3EF 1111101XXX Off Off Off Off Off On Off

300-307 1100000XXX Off Off On On On On On

328-32F 1100101XXX Off Off On On Off On Off

3F8-3FF 1111111XXX Off Off Off Off Off Off 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 is selected as a base. Address 300 in binary

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

1 2 3 4 5 6 7 8

ENA3A9

Figure 2-DIP-Switch Illustration

Note: 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.

Card Setup

Sealevel Systems Dual SIO Page 3

Port Enable / Disable

Each port on the Dual SIOcan 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 E1 and E2 select the interrupt requests 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.

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.

2/9

Figure 3-Header E6, IRQ Selection (Factory Default)

Note: The actual Silk-Screen for the Dual SIO may have a “2” in place of

the IRQ “2/9” selection.

Any two or more ports can share a common IRQ by placing the jumpers

on the same IRQ setting if desired, due to a unique open collector/pull-up

IRQ drive circuit. Consult your particular software for IRQ selection. If

no interrupt is desired, remove the jumper.

Card Setup

Sealevel Systems Dual SIO Page 4

RTS Enable for RS-485

Headers E3 and E4 select whether the RS-485 driver is enabled by the

UART signal Request To Send (RTS) or always enabled. With the jumper

installed, RTS enables the driver. Removing the jumper enables the driver

regardless of RTS. E3 controls Port 2 while E4 controls Port 1. This

jumper should only be installed if you are running the board in a multi-

drop polled environment such as RS-485. For normal point to point

RS-422, such as terminal emulation, remove this jumper. Figure 4 shows

both ports configured for RS-422 operation.

Figure 4-Header E3 and E4, RS-485 Enable

Installation

Sealevel Systems Dual SIO 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.

The Dual SIO can be installed in any of the PC expansion slots. The Dual

SIO 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 Dual SIOinto 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 Dual SIO Page 6

Technical Description

The Dual SIO adapter utilizes the 16550 UART chip. This chip features

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

transmit and receive FIFO.

Features

•Fully independent operation of ports allowing two ports ports of

RS-422, Two ports of RS-485, or one port of each

•Addressable as COM1: -COM4: or any other I/O address up to 3FF

Hex

•"Shareable" IRQs allow more than one port to share a single IRQ

•IRQ's 2/9, 3, 4, 5 supported

•Support for non-standard baud rates available. These baud rates (such

as 31.25K or 76.8K baud) are supported by installing a different

oscillator. Please consult Sealevel Systems Technical Support for

more information.

•Driver software included for Windows RS 485 operation

Line Termination

Typically, each end of the RS-422/485 bus must have line terminating

resistors. A 100 ohm resistor is across each RS-422/485 input and a 1K

ohm pull-up/pull-down combination bias the receiver inputs. If more than

two RS-485 nodes are configured in a multi-drop network, only the nodes

at each end of the bus should have the 100 ohm resistors installed.

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