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Product Overview 1 of 3

Product Overview

The RocketPort USB Serial Hub (RPUSBSH)

connects to a Universal Serial Bus (USB) port on a

PC and provides up to four ports serial interface

connections. The RPUSBSH series includes two

models:

• RS-232

• RS-422

RocketPort USB Serial Hub series supports the

following features:

• Four independent high-speed serial interfaces

(RS-232 or RS-422, depending upon model)

• Speeds up to 115.2 Kbps

• 128-byte FIFO, which relieves the CPU of

excessive interrupts

• The serial ports appear as COM ports that

support all standard RS-232 or RS-422 devices

• “Plug-and-Play” and “Hot Plug” capability

• Bus powered

• Compatible with USB specification 1.0/1.1

• Windows 98 compatible

The RocketPort USB Serial Hub series uses an

internally generated 48 MHz controller specifically

designed for a USB port to operate four serial port

communications ports. With the USB standard of

high-speed data transfers, this device is ideal for

connections to high-speed modems or ISDN terminal

adapters. This device and its software enable the

USB interface to be transparent to the peripheral

and requires no firmware changes. This makes it

possible for serial peripherals to easily interface with

a USB port. This feature is ideal for legacy

applications.

Installing the Hardware

Hardware installation is discussed in the Software

Installation document.

Using the Optional Power Supply

Feature

Use the optional power supply feature if you are

connecting to a USB hub with cables longer than the

5 meters, which is specified in the USB specification.

If connecting to a USB hub (not a PC USB port), the

USB hub must be self-powered (external power

supply).

If you want to connect a third-

party power supply to the

RocketPort USB Serial Hub, it

must be a UL Listed Direct

Plug-In Power Unit identified

as Class 2 and rated 5V DC +/-

10% and 1 A +/- 20%. Polarity is illustrated in this

figure and marked on the back of the unit above the

connector.

Note: Failure to use the correct power supply may

damage the unit and void the warranty.

LED Description

The Power light (amber) on the front of the unit

indicates that there is power coming into the unit.

Note: This does not signify that the unit is working

properly. Use WCOM32 supplied with the

driver to diagnose possible problems with the

unit.

Building Cables

Use the following table for pinout information for the

DB9 serial port connectors on the RocketPort USB

Serial Hub.

Building Additional Loopback Plugs

Loopback connectors are DB9 female serial port

plugs with pins wired together as shown, and are

used with WCOM to test serial ports. The RPUSBSH

is shipped with a single loopback plug. This

information can help you build additional plugs or

replace a missing loopback.

Number

RS-232

Signals

RS-422

Signals

1 DCD Not used

2 RxD RxD-

3 TxD TxD-

4 DTR Not used

5 GND GND

6 DSR Not used

7 RTS TxD+

8 CTS RxD+

9 RI Not used

- +

Inside positive,

outside negative.

RocketPort™ USB Serial Hub

(RPUSBSH)

Hardware Documentation

1 2 3

Summary of Contents

Page 1

Product Overview 1 of 3Product OverviewThe RocketPort USB Serial Hub (RPUSBSH) connects to a Universal Serial Bus (USB) port on a PC and provides up t

Page 2 - Technical Support

Operating Conditions 2 of 3Wire the following pins together for an RS-232/422 loopback plug.• Pins 1 to 4 to 6 • Pins 2 to 3• Pins 7 to 8 to 9Operatin

Page 3 - Technical Support 3 of 3

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