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Quatech Freedom USB Adapter User's Manual
Introduction
Note: These products comply
fully with USB Specification
version
1.1
and
are
supported
under
Windows
98/ME/XP/2000/NT4.
Note: The 16550 is well suited
for applications involving high
data
rates
and
for
multitasking environments. The
larger
FIFO
allows
read/write access to the UART
to move more data, resulting in
fewer
interrupts
and
processor time spent servicing
the UART.
Rev 2.02 (2/24/2004)
This Users Manual describes how to setup and install your Quatech
Freedom USB Adapter.
The Quatech SSU-100, DSU-100, QSU-100, ESU-100, and HSU-100,
fully
respectively, provide one, two, four, eight, and sixteen independent
RS-232 serial interfaces to the host PC via the Universal Serial Bus
(USB) port.
The Quatech DSU-200/300, QSU-200/300, ESU-200/300, and HSU-
200/300, respectively, provide two, four, eight, and sixteen
independent asynchronous serial interfaces via the USB port. Each of
these interfaces can be used as desired for either RS-422 or RS-485
communications.
For convenience, this manual refers to all these products as Freedom
USB unless otherwise noted.
The following table details the port and connection configuration for
all the Freedom USB devices.
Table 1 - Device port and connection options
Device
Ports Connection
SSU-100
1
DSU-100
2
QSU-100
4
ESU-100
8
HSU-100
16
Each adapter comes standard with 16550 Universal Asynchronous
Receiver/Transmitters (UARTs) containing 16-byte First In First Out
(FIFO) storage devices. These FIFOs, in conjunction with the USB
heavy
micro controller FIFOs, help to relieve the CPU of excessive
interrupts by buffering received and transmitted data. This
each
configuration allows each channel (either two or four) to obtain data
rates up to 460.8 kbps. The adapters are USB bus-powered; therefore
less
no external power supply is required.
The Freedom USB products are Plug-and-Play devices and require no
hardware configuration. Your computer's BIOS or operating system
automatically configures the ports when you install the device.
Device
RS-232
RS-232
DSU-200/300 2
RS-232
QSU-200/300 4
RS-232
ESU-200/300
RS-232
HSU-200/300 16
Introduction
Ports Connection
RS-422
RS-422
RS-422
8
RS-422
RS-422
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