SeaLevel SeaLINK+8/USB User manual

SeaLINK+8/USB

User Manual | 280X

Contents

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

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

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

INSTALLATION & CONFIGURATION...................................................................................................................5

PHYSICAL INSTALLATION..................................................................................................................................6

CONFIGURATION................................................................................................................................................. 7

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

SPECIFICATIONS ...............................................................................................................................................11

APPENDIX A – TROUBLESHOOTING................................................................................................................12

APPENDIX B – HOW TO GET ASSISTANCE .....................................................................................................13

APPENDIX C – ELECTRICAL INTERFACE ........................................................................................................14

APPENDIX D – ASYNCHRONOUS COMMUNICATIONS ..................................................................................15

APPENDIX E – COMPLIANCE NOTICES...........................................................................................................16

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

Introduction

Overview

The Sealevel Systems SeaLINK+8 family of products equips the PC with 8 USB to Asynchronous serial

ports. Three different model numbers are available that offer a variety of port options. Model 2801 equips

the PC with 8 additional RS-232 ports that support a full RS-232 interface and data rates up to 460.8K baud.

Model 2802 equips the PC with 8 RS-422/485 ports that support data rates up to 921.6K baud and provide

selectable line termination and biasing. 2-wire RS-485 line turnaround is supported via an onboard hardware

circuit. Model 2803 equips the PC with 8 user configurable RS-232/422/485 ports. Each port is individually

configurable, and the interface is selected by configuring two dipswitch positions. The advantage of this

product over more traditional approaches is that it does not require opening the computer case, nor does

it require resources such as I/O ports or IRQs. It does require a system that supports USB both in terms of

hardware and operating system.

Before You Get Started

What’s Included

The SeaLINK+8 is shipped with the following items. If any of these items is missing or damaged, contact

the supplier.

•SeaLINK+8 USB to Asynchronous Serial Converter

•USB Cable Part Number CA179 for Connecting to Upstream Host/Hub

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.

Installation & Configuration

Software Installation

Windows Installation

Do not install the Adapter in the machine until the software has been fully installed.

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 from the Sealevel software

driver database.

2. Type in or select the part number (#2801, 2802, 2803, or 2804) for the adapter from the

listing.

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

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

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

5. 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.

6. 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.

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

To confirm that the SeaCOM driver has been successfully installed, click on the ‘Start’ button, and then

select ‘All Programs’. You should see the ‘SeaCOM’ program folder listed.

You are now ready to proceed with the physical installation of your SeaLINK USB serial adapter.

Windows NT is not USB aware and thus cannot support this device.

Physical Installation

The screen captures below are taken from a Windows 98 installation. Your particular operating system

may differ slightly from what is shown based on your version of Windows.

The SeaLINK+8 can be connected to any upstream type “A” port, either at the PC host or an upstream hub.

The SeaLINK+8 is hot pluggable, meaning there is no need to power down your computer prior to

installation.

Connect the SeaLINK+8 to an upstream host or hub.

The New Hardware Found wizard will now proceed to locate the appropriate drivers. These drivers were

installed during the SeaCOM software setup procedure. Once the drivers are found a new window will pop

up indicating the installation of each of the eight new ports.

If you view the system’s Device Manager, you should have new “COM” ports in the Ports (COM & LPT)

Device Class. This is shown on the following page.

You can access your new COM: ports by using the assigned COM: identifiers as shown above. In this case,

it is COM’s 12 thru 19. However, this assignment will vary from system to system. At this point, the hardware

is recognized and ready to use.

Configuration

Factory Configuration

Each device ships from Sealevel Systems with the following configuration.

Model 2801 – SeaLINK+8/232 USB to RS-232 Converter

Contains no user configurable components.

Model 2802 – SeaLINK+8/485 USB to RS-422/485 Converter

RS-422 4-wire full duplex mode selected.

Transmitter always enabled.

Receiver always enabled and terminated and biased as follows:

120ohm terminator between RX+ and RX-

1Kohm pull-up on RX+

1Kohm pull-down on RX-

Model 2803 – SeaLINK+8 USB to RS-232/422/485 Converter

RS-422 4-wire full duplex mode selected.

Transmitter always enabled.

Receiver always enabled and terminated and biased as follows:

120ohm terminator between RX+ and RX-

1Kohm pull-up on RX+

1Kohm pull-down on RX-

In order to change the configuration the box must be opened. Do this by removing the four screws that

attach the two halves of the box.

Electrical Interface Selection

Each port of the SeaLINK+8 models 2802 and 2803 can be individually configured for the specific electrical

interface. Model 2802 supports RS-422/485 while Model 2803 supports RS-232/422/485. This is selectable

via the dipswitch associated with each port. Each of the switch positions is described on the following

page.

Below is a figure of dipswitches SW1, SW2, SW3, and SW4. Each switch has a total of twelve positions and

serves to configure two ports. Six positions are used for each port. The default mode of RS-422 4-wire full

duplex is shown.

Figure 1- Dip Switches SW1 - SW4 RS-422 Default Mode

Mode Select Configuration

The first two positions for each port are used to select the electrical interface mode. In RS-422 mode the

transmitter and receiver are always enabled.“485 WE” refers to RS-485 mode with receiver echo. In this

mode the receiver is always enabled. If the card is in 2-wire mode, all transmitted data will be “echoed”

back. “485 NE” refers to RS-485 mode with no receiver echo. In this mode the receiver is enabled only when

no data is being transmitted. In either RS-485 mode the transmitter is only enabled during data

transmission. Refer to the chart below for specific switch settings. Note that this chart appears in the silk

screen on the board as well.

Figure 2- Electrical Interface Mode Selection

OFF

PORT 1PORT 2

SW1

M0M1TPU

MODE

M0M1TPUPUPD

MODE

OFF

PORT 3PORT 4

SW2

M0M1TPU

MODE

M0M1TPUPUPD

MODE

OFF

PORT 5PORT 6

SW3

M0M1TPU

MODE

M0M1TPUPUPD

MODE

OFF

PORT 7PORT 8

SW4

M0M1TPU

MODE

M0M1TPUPUPD

MODE

SWITCH

232

MODE SELECT

422

485 WE

485 NE

OFF OFF

M1 M0

OFF

ON ON

Interface Biasing Configuration

The last four positions for each port are used to select the line termination and bias settings. Refer to the

chart below for specific switch settings of the three supported electrical interface modes. Note that this

chart appears in the silk screen on the board as well.

PD = 1Kohm pull-down resistor connected to RX-

RS-232 mode = always OFF

RS-422 mode = always ON

RS-485 mode = ON if not provided by another device on the bus

PU = 5.1Kohm pull-up resistor connected to CTS+

RS-232 mode = always OFF

RS-422 mode = always ON

RS-485 mode = always ON

PU = 1Kohm pull-down resistor connected to RX+

RS-232 mode = always OFF

RS-422 mode = always ON

RS-485 mode = ON if not provided by another device on the bus

T = 120ohm terminating resistor connected between RX+ and RX-

RS-232 mode = always OFF

RS-422 mode = always ON

RS-485 mode = ON if physically located at one end of bus

Figure 3 - Electrical Interface Termination and Biasing Selection

Contrary to some of our other products, there are no provisions on board for looping TX+ to RX+ and

TX- to RX- for 2-wire RS-485 mode. These connections must be made externally inside the mating

DB-9 connector. Refer to the RS-422 pinout diagram for the appropriate pin numbers.

SWITCH

232

INTERFACE BIASING

422

485

OFF OFF

PD PU

OFF OFF

PU T

ON*

* = IF END OF 485 BUS

Technical Description

The SeaLINK+8 utilizes eight USB UARTs. These chips feature programmable baud rate, data format, 128

byte Dual Port TX Buffer, and 384 byte Dual Port RX Buffer. The RS-232/422/485 transceiver supports data

rates up to 921.6K baud for RS-422/485 and 460.8K baud for RS-232.

Features

•Hot pluggable device that does not require opening the case

•No system resources are required (i.e. I/O ports or IRQs)

•LED status indicators for power and port activity

CONNECTOR PIN ASSIGNMENTS

RS-422/485 (DB-9 Male)

Signal

Name

Pin #

Mode

GND

Ground

TX +

Transmit Data Positive

Output

TX-

Transmit Data Negative

Output

RTS+

Request To Send Positive

Output

RTS-

Request To Send Negative

Output

RX+

Receive Data Positive

Input

RX-

Receive Data Negative

Input

CTS+

Clear To Send Positive

Input

CTS-

Clear To Send Negative

Input

RS-232 (DB-9 Male)

Signal

Name

Pin #

Mode

GND

Ground

Transmit Data

Output

RTS

Request To Send

Output

DTR

Data Terminal Ready

Output

Receive Data

Input

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