Quatech ESU-100-EMB, QSU-100-EMB, QSU-200-EMB, QSU-300-EMB Specifications

USB Serial Adapters -- Embedded Models

Upgrade to USB connectivity without replacing peripheral
hardware or application software

Technology advances and legacy-free
motherboards are significantly impact­ing port expansion options. In some
cases the USB port is the

Quatech USB Embedded Serial Adapters are
the industry’s fastest and are ideal board-level
solutions that can be easily integrated into
kiosks and other custom enclosures.

only choice, which can be a problem if
your network relies on serial devices.

Quatech has the solution.

Industry-leading features include
fastest speeds

Quatech’s USB Serial Adapters are
based on the idea that taking
advantage of new technology should not
necessitate abandoning legacy devices
and the applications written for them.
Features like industry-leading speed,
plug-and-play and surge suppression
make Quatech USB Serial Adapters the
ideal solution for a wide variety of
industries such as banking, retail and
industrial automation where PCs have
significantly shorter lifecycles than the
peripherals used with them.

standard RS-232 or RS-422/485 devices
and the software created for them.

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 Embedded USB Serial Adapt­ers. These reliable units use the same
technology as our standard products and
enable manufacturers and integrators to
easily incorporate multiple serial inter­face devices such as keypads,
displays, card readers, and printers into
custom enclosures that lack native
serial support without changing
software written for serial
port communications.

Available with 4 or 8 independent ports,
the small-footprint boards have built-in
surge suppression at each serial port,
necessary for maximum reliability and
robustness. Mounting holes allow easy
installation into cabinets and kiosks. For
maximum flexibility, each port on 200/
300 models can be configured as RS­422 or RS-485 in any combination, mean­ing a single adapter can be used to
implement multiple full-duplex and half­duplex multi-drop networks.

Complete, boxed (external) models are
also available.

Features and Benefits

Four or eight independent
serial ports

RS-232 or RS-422/485
Embedded (board only) units
Plug-and-play capability
Devices enumerate them

selves as standard COM
ports

Speeds up to 115.2 kbps
Standard 16550 UARTs with

16-byte FIFOs to boost data
rates

Surge suppression package ­standard

Full modem control and
hardware and software flow
control

Bus powered: no external
power required

Windows 98/Me/NT/2000/XP/
Vista

Five year warranty

Quatech USB Serial Adapters enumer­ate themselves as standard COM ports
that are compatible with all

5675 Hudson Industrial Parkway ● Hudson, OH 44236

1.800.553.1170 ● +1.330.655.9000 ● www.quatech.com

USB SERIAL ADAPTER SPECIFICATIONS

Bus Interface
USB 1.1, USB 2.0 compatible

Ordering Information

Model Ports Interface

QSU-100-EMB 4 RS-232 w/ cable
ESU-100-EMB 8 RS-232 w/ cable
QSU-200/300-

EMB 4 RS-422/485 w/ cable

OS Support
Windows 98/Me/NT/2000/XP/Vista

SunRay Server (SSU/QSU-100)
Linux

Data Rate

115.2 (max)
Serial Ports Provided
QSU:4 ESU:8

(For 200/300 models, each configurable as RS­422 or RS-485 for full or half duplex
communication)

USB Ports Required
QSU:1 ESU:1
UARTs
16550 UARTs with 16-byte FIFOs (1 per port)
Transceiver (RS-232)
SP211HB

Surge Suppression: 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. Surge suppression is not available
with SSU-100-EMB.

Communication Modes
Full-duplex, half-duplex using RTS, Half-duplex

using DTR, Half-duplex automatic transmitter
control.

RS-422/485 Differential Driver Output (27Ù
Load):

+1.5V (min), +5V (max)

High Input: +2V (min)
Low Input: +0.8V (max)
Driver Rise/Fall Time: 5ns (min), 15ns (typ),

25 ns (max)
Driver Input to Output Delay: 10ns (min), 30ns
(typ), 60ns (max)
Receiver Input to Outpul Delay: 20ns (min),
90ns (typ), 150ns (max)

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

QSU: 0.56”H x 6.90”W x 4.00”D
ESU: 1.31”H, 6.52”W x 4.80”D

DB9-F Pinout (RS-422/485 for
Q/ESU-200/300-EMB)

Board Layout for QSU Models

Board Layout for ESU Models

Transceiver (RS-422/485)
MAX491 or compatible
RS-232 Output

Voltage Swing: ±5V (min), ±7V (typ)

RS-232 Input

Voltage Range: -15V (min), ±15V (max)
Input Threshold Low: 0.8V (min), 1.2V (typ)
Input Threshold High: 2.4V (max), 1.7 (typ)

Connectors
DB-9 male
Certifications
CE, FCC Class B

Pinouts & Board Layouts

DB9-M Pinout (RS-232 for Q/ESU-100-EMB)

5675 Hudson Industrial Parkway, Hudson, OH 44236

1.800.553.1170 ● +1.330.655.9000 ● www.quatech.com

Rev 2.0, 1-2007