SeaLevel SeaPORT+2/485 Manuale utente

SeaPORT+2/485

User Manual | 2202

Contents

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

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

INSTALLATION INSTRUCTIONS .........................................................................................................................5

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 ........................................................................................................................................................18

Introduction

The Sealevel Systems equips the PC with 2 USB to RS-422/485 Asynchronous serial ports providing a

versatile interface for common serial needs. 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 IRQ’s. It does require a system that supports USB both in terms of hardware and operating system.

Before You Get Started

What’s Included

The SeaPORT+2/485 is shipped with the following items. If any of these items is missing or damaged,

contact the supplier.

•SeaPORT+2/485 USB to RS-422/485 Serial I/O Adapter

•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 Instructions

Windows 98/ME/2000/XP/Vista™ Operating Systems

Do not connect the device to a USB port until the software is installed.

1. Begin by locating, selecting, and installing the correct software from the Sealevel software driver

database.

2. Select the Part Number (2202) for your device from the listing.

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

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

4. A screen may appear with the declaration: “The publisher cannot be determined due to the

problems below: Authenticode signature not found.” Please select 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, you 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 included to remove the driver and all registry/INI

file entries from your system.

6. 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 SeaPORT+2/485 can be connected to any upstream type “A” port either at the PC host or an upstream

hub. The SeaPORT+2/485 is hot pluggable, meaning there is no need to power down your computer prior

to installation.

Connect the SeaPORT+2/485 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 four 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 3 and 4. However, this assignment will vary from system to system. At this point, the hardware is

recognized and ready to use.

Configuration

Original Configuration

This device ships from Sealevel Systems with the following configuration.

422 mode,

120 ohm termination,

1K ohm pull up on RX+

1K ohm pull down on RX-

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

on the bottom. When reassembling please note that the top and bottom are keyed to fit in only one direction.

Electrical Interface Selection

Each of the two ports on the SeaPORT+2/485 can be individually configured as an RS-422, or RS-485

interface. This is selectable via the DIP switches and DIP shunts. Each of the switch positions is described

on the following page.

Switch Descriptions

Figure 1: Switche SW4

L485 option, OFF for 422.

OFF: No effect

ON : Connects TX+ to RX+ for two-wire operation

L485 option, OFF for 422.

OFF: No effect

ON : Connects TX- to RX- for two-wire operation

PU 485 option, OFF for 422.

OFF: No effect

ON : Adds a 1 K ohm pull-up resistor to RX+

PD 485 option, OFF for 422.

OFF: No effect

ON : Adds a 1 K ohm pull-down resistor to RX-

T422 and 485 option.

OFF: No effect

ON : Adds a 120 ohm termination resistor between RX+ and RX-

1 2 3 4 5 6 7 8

OFF 910

Port 1

Port 2

SW4

Switch Examples

Figure 2: RS422/485 Interface Configuration

485 Mode Selection

OFF : 422 Mode

The transmitter lines TX+ and TX- are always driven

ON : 485 Mode

The transmitter lines TX+ and TX- are switched to high impedance when the device is

not actively transmitting data

NE 485 option, OFF for 422

OFF : The receiver is always enabled. In a two-wire setup the receiver will echo back all

transmitted data.

ON : The receiver is disabled when the transmitter is enabled. In a two-wire setup the receiver

will not echo back transmitted data.

Switch positions 1 and 2 are for port 1 and switch positions 3 and 4 for port 2.

1 2 3 4

OFF

485 1

NE 1

485 2

NE 2

SW3

Technical Description

The SeaPORT+2/485 utilizes two 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-422/485 transceiver supports data

rates up to 921.6K baud.

Features

•Hot pluggable device that does not require opening the case

•No system resources are required (i.e., I/O ports or IRQ’s)

•LED status indicators for USB Enabled 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

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