USB
to Serial Adapter
3
Introduction
This User’s Manual describes how to setup and install your USB-to-
Serial Adapter.
The QSU2-100 and ESU2-100, respectively, provide four and eight
independent RS-232 serial interfaces to the host PC via the Universal
Serial Bus (USB) port.
The QSU2-400 and ESU2-400, respectively, provide four and eight
independent asynchronous serial interfaces via the USB port. Each of
these interfaces can be used as desired for RS-232, RS-422 or RS-485
communications.
Table 1 - Device port and connection options
Device
Ports Connection
Device
Ports Connection
QSU2-100
4
RS-232
QSU2-400
4 RS-232/422/485
ESU2-100
8
RS-232
ESU2-400
8 RS-232/422/485
Each adapter uses high-speed UARTs and deep FIFOs, allowing each
channel to obtain data rates up to 921.6 kbps. The adapters are
powered over their USB connection (bus-powered), eliminating the
need for an external power supply. The adapters are Plug-and-Play
devices and require no hardware configuration.
System Requirements
The USB-to-Serial adapters are supported under the Windows 2000/XP
(and later) and Linux operating systems. One USB port is required to
connect the adapter to your computer. You can use either a built-in
USB port or an add-in USB host adapter. We recommend the use of a
USB 2.0 port for best performance. Contact our sales department for
details on current software offerings.
Note: These products comply
fully with USB Specification
version 2.0. They will also
operate over slower USB 1.1
connections at a slightly
reduced performance level.
Note: The “-400” designation
indicates an “MEI” device.
MEI is an acronym for
“Multiple Electrical Interface.”
The interface is software-
selectable for each serial port.
