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Description
Quatech Embedded USB Serial Adapters are designed to seamlessly connect
multiple serial peripherals via a single USB port. This enables 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 one, four or eight 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 the 400
models can be configured as RS-232, RS-
422 or RS-485 in any combination, meaning
a single adapter can be used to implement
multiple full-duplex and half-duplex multi-drop
networks.
Application: Banking Teller Station
Quatech Product Used: QSU-100-EMB Four Port Embedded USB to RS-232 Serial Adapter
A typical bank teller station is comprised of a number of peripheral devices such as CRTs, cash drawers, card readers, check printers, and keypads. These banking peripherals have historically used a standard serial interface to the host PC. However, as the number of expansion slots available in new PCs continues to shrink, banks are increasingly turning to USB as the peripheral interface of choice. If the bank were to replace the many thousands of serial peripherals it owns with USB-based peripherals it would require an extremely high capital expenditure.
Quatech embedded USB to serial adapters provide banks with an ideal solution. These adapters can connect up to 16 peripheral devices to a host PC via the USB port, allowing banks to continue to use their existing equipment while taking advantage of the benefits USB provides. |
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RS-232 |
RS-232/422/485 |
| Bus Interface |
High Speed USB 2.0 |
| OS Support |
Windows 2000/XP/Vista and Linux support available
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Windows 2000/XP/Vista and Linux support available |
| Serial Ports Provided |
SSU:1 QSU:4 ESU:8 |
QSU:4 ESU:8 |
Each port configurable as RS-422 or RS-485 for full or half duplex communication |
| USB Ports Required |
SSU:1 QSU:1 ESU:1 |
QSU:1 ESU:1 |
| Data Rate |
up to 921.6 kbps |
| UARTs |
1024-byte transmit and receive FIFOs |
| Transceiver |
SP211HB |
MAX491 or compatible |
| RS-232 Output |
Voltage Swing: ±5V (min), ±7V (typ) |
N/A |
| RS-232 Input |
Voltage Range: -15V (min), +15V (max) |
N/A |
| Input Threshold Low: 0.8V (min), 1.2V (typ) |
| Input Threshold High: 2.4V (max), 1.7V (typ) |
| Differential Driver Output (50W Load) |
N/A |
+3.3V (max) |
| Differential Driver Output (27W Load) |
N/A |
+1.5V (min), +3.3V (max) |
| High Input |
N/A |
+2V (min) |
| Low Input |
N/A |
+0.8V (max) |
| Driver Rise/Fall Time |
N/A |
5ns (typ), 20ns (max) |
| Driver Input to Output Delay |
N/A |
20 ns (min), 40 ns (typ), 60 ns (max) |
| Receiver Input to Output Delay |
N/A |
40 ns (min), 70 ns (typ), 100 ns (max) |
| Environment |
Operating: 0°C to 70°C |
Storage: -50°C to 80°C |
Humidity: 10% to 90% |
| IND Option |
Surge suppressor applied to each line that is capable of sustaining up to 40A peak, 8 x 20µs 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) |
| Power Requirements |
Bus-powered device, no external power supply required. |
Suspend power: < 500 µA |
Unconfigured power: < 100 mA |
Configured Power: < 500 ma |
| Size |
SSU2: 0.56” H x 3.87” W x 1.40 ” D |
| QSU2: 0.72” H x 6.52 ” W x 5.20 ” D |
| ESU2: 1.31” H x 6.52” W x 5.20 ” D |
| Connectors |
DB-9 male (see connector pinout) |
| Certifications |
CE, FCC Class B, RoHS & WEEE Compliant |
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