1-2 Chapter
1:
Introduction
Echo
User's Manual, ver. 0.00
Product Overview
The Echo adapters are high performance multi-port serial
adapters that allow you to connect up to 8 serial devices through
one expansion slot.
Your Echo product consists of the following components:
Echo adapter
Cable harness or external connector box
DFlex DOS device drivers (the Echo is backwards
compatible with our discontinued ISA product, the DFlex.
While the drivers will contain reference to the DFlex
product, they are fully compatible with the Echo/ISA.)
Echo Adapters
Echo adapters provide the high speed interfaces between a host
computer and multiple external serial devices. Echo adapters
include features such as:
8 asynchronous serial ports out of one slot.
RS-232, RS-422/485 interfaces.
Different models of Echo adapters may reside in a host
computer offering up to 32 ports per system.
ST16C554 UARTs control each port.
An addressable status control register to improve
performance.
Each port on an Echo has independent baud rate selection
offering baud rates from 50 – 115.2 Kpbs with 5, 6, 7 or 8
data bits and 1, 1.5, 2 stop bits, odd or even parity.
On board DIP switch allows the selection of ports 1 & 2 as
COM1 and COM2. It provides 8 predefined I/O address sets
and 8 predefined status port addresses.
Jumpers on the board give the user a choice of 8 IRQ lines to
run the board at. The on board DIP switch also provides the
choice of running the Echo on 1 or 2 or no hardware
interrupts.
System requirements are one ISA bus compatible slot; one
available IRQ line.
