2. Introduction
2.1 Overview
The USB Hub equips the PC with 2 or 4 USB to RS-232/422/485 or RS-422/485 asynchronous serial ports. It gives you a versatile interface for common serial needs. Three models are available:
•The Dual-Port USB Hub (IC1020A) has 2 USB ports to RS-232/422/485 serial ports.
•The Quad-Port USB Hub (IC1021A) has 4 USB ports to RS-422/485 serial ports.
•The Quad-Port USB Hub (IC1022A) has 4 USB ports to RS-232/422/485 serial ports.
Unlike more traditional products, the USB Hub 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.
2.2 What’s Included
The USB Hub is shipped with the following items.
•(1) Dual-Port USB Hub RS-232/422/485, Quad-Port USB Hub RS-422/485, or Quad-Port USB Hub RS-232/422/485.
•(1) USB cable for connecting to the upstream host/hub.
•(1) CD-ROM disk containing drivers and installation software.
•This users’ manual.
If anything is missing or damaged, contact Black Box at 724-746-5500.
2.3 Technical Description
The Dual-Port USB Hub (IC1020A) uses two chips. The Quad-Port USB Hubs (IC1021A and IC1022A) use four chips. 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 and the RS-422/485 transceivers support data rates up to 921.6 kbps for RS-422/485 and 460.8 kbps for RS-232.
