Quatech USB Serial Adapters User Manual

High Speed USB Serial Adapters

KEY FEATURES

1, 2, 4 or 8 independent serial ports

RS-232 or software-selectable
RS-232/422/485

Compatible with USB 1.1

Plug-and-play capability

Devices enumerate themselves as
standard COM ports

Speeds up to 921.6 kbps

High speed UARTs with 1KB FIFOs to
boost data rates

Optional surge suppression package
(standard on Embedded products)

Full modem control and hardware and
software flow control

Bus powered: no external power required

Embedded (board-only) units also
available

Windows 2000/XP/Vista and Linux

RoHS compliant

NEW! USB to RS-422/485 Converter

5 year warranty

Connect serial peripherals with USB

2.0 Serial Adapters

If speed, expansion and support are
what you’re looking for in a USB Serial
Adapter, think Quatech.

You can now broaden the range of
external peripherals used on your
computer at higher speed rates than the
USB 1.1 series, with the introduction of
the High Speed USB 2.0 Serial
Adapters. The USB 2.0 has more
bandwidth that allows higher data rates
on the serial ports for more efficiency.

The new High Speed USB Serial
Adapter line gives your laptop or
workstation the ability to communicate
between a USB port and up to eight RS­232, RS-422, or RS-485 serial
peripherals. It adds the COM port(s) via
its USB connection and is compatible
with new and legacy RS-232 or RS­232/422/485 devices. The USB Serial
Adapters are the ideal solution for a
variety of industries and applications
including banking, retail and industrial
automation where PCs have a
significantly shorter lifecycle than the
peripherals that use them.

For over 20 years, Quatech has been
known to help you Connect with
Reliability. As we continue in the race to
become the industry leader, our high
performance device connectivity line
expands with the new high speed USB

2.0 Serial Adapters. The next generation
Quatech USB Serial Adapter hits speeds
of up to 921.6 kbps, 1024-byte FIFO and
hardware and software flow control.

Quatech USB Serial Adapters
enumerate themselves as standard
COM ports that are compatible with all
standard RS-232 or RS-232/422/485
devices and software created for them.
With the industrial surge suppression
“IND” option, you can safeguard the USB
Serial Adapter. The “IND” option is ideal
for implementing USB-to-serial networks
in factories, power plants and other
potentially harsh industrial
environments. USB 2.0 is fully
compatible with USB 1.1 devices. The
older devices work with the new bus,
and vice versa.

The 400 Series models introduce the
software-selectable RS-232/422/485
(Multi-Electrical Interface or MEI). The
MEI capability is available on all ports at
the click of a mouse. LEDs visually tell
you which ports are using which
protocol, so go ahead, mix and match.

Auto detect between RS-422 and RS­485 with Quatech’s new USB Serial
Converter.

Embedded USB Serial Adapters for
custom enclosures

If you’re looking to seamlessly connect
multiple serial peripherals via a single
USB port in a custom enclosure, try
Quatech’s board-level solutions,
Embedded USB Serial Adapters.

5675 Hudson Industrial Parkway * Hudson, OH 44236

1.800.553.1170 * +1 330.655.9000 * www.quatech.com

Rev C
2/2008

Standard serial ports via USB 2.0 without replacing peripheral hardware
or application software

HIGH SPEED USB 2.0 SERIAL ADAPTER SPECIFICATIONS

5675 Hudson Industrial Parkway * Hudson, OH 44236

1.800.553.1170 * +1 330.655.9000 * www.quatech.com

Rev. C
2/2008

Ordering Information

Bus Interface

USB 2.0 High Speed

OS Support

Windows 2000/XP/Vista and Linux support

Data Rate

Up to 921.6 kbps (max)

Serial Ports Provided
SSU: 1 DSU: 2 QSU: 4 ESU: 8

(For 400 models, each configurable as RS-232, RS­422 or RS-485 for full or half duplex communication)

USB Ports Required
SSU: 1 DSU: 1 QSU: 1 ESU: 1

UARTS

1024-byte FIFOs for transmit and receive

Transceiver (RS-232/422/485)

MAX491 or compatible

Differential Driver Output (50Ù Load):

+2V (min), +3.3V (max)

Differential Driver Output (27Ù Load):

+1.5V (min), +3.3V (max)

High Input: +2V (min)
Low Input: +0.8V (max)
Driver Rise/Fall Time: 5ns (min), 20ns (typ), 25ns

(max)
Driver Input to Output Delay: 20ns (min), 40ns (typ),
60ns (max)
Receiver Input to Output Delay: 40ns (min), 70ns
(typ), 100ns (max)

RS-232 Output
Voltage Swing: ±5V (min), ±5.4V (typ)

RS-232 Input
Voltage Range: -15V (min), +15V (max)
Input Threshold Low: 0.6V (min), 1.0 (typ)
Input Threshold High: 2.4VV (max), 1.5 (typ)

IND Option: Surge suppression applied to each line that

is capable of sustaining up to 40A peak, 8 x 20ìs
transient surges, a clamping voltage of 30V and a peak
energy dissipation of 0.1 Joules.

(NOTE: The “IND” option limits data rate to

115.2 kbps)

Environment
Operating: 0° to 70°C
Storage: -50° to 80° C
Humidity: 10% to 90%

Power Requirements

Bus-powered device, no external power supply required

Suspend power: < 500 ì A
Unconfigured power: < 100 mA
Configured power: < 500 mA

Size

SSU: 3.6” L x 1.7” W x 1” H
DSU/QSU: 9.18” L x 5.25” W x 1.675” H
ESU: 9.18” L x 5.25” W x 2.363” H

Connectors

DB-9 male

Certifications

CE, FCC Class B, RoHS & WEEE Compliant

Model Ports Interface

DSU2-100 2 RS-232 with cable

DSU2-400 2 RS-232/422/485 with cable

QSU2-100 4 RS-232 with cable

QSU2-400 4 RS-232/422/485 with cable

ESU2-100 8 RS-232 with cable

ESU2-400 8 RS-232/422/485 with cable

Retail Application

Banking Application

High Speed Modem

Central Bank Server at

Remote Location

Multiport USB to

RS-232 Serial Adapter

Branch Host PC

RS-232

RS-232

Teller Station 1

Teller Station 2