Description  Specifications   Download PDF

 Description 

Part of the FreedomUSB Series, Quatech’s QSU-100 provides four independent RS-232 serial interfaces to a PC via the USB port. It comes standard with four independent 16550 UARTs containing 16-byte FIFOs. These FIFOs, along with the FIFOs in the USB microcontroller, help to relieve the CPU of excessive interrupts by buffering received and transmitted data, making each channel capable of data rates up to 115.2 kbps.

To allow the continued use of existing application software designed for traditional serial adapters, the QSU-100 enumerates itself as standard COM ports. Thus, users can continue employing their present serial devices, such as scanners, modems, barcode readers, touch-screens, ISDN terminal adapters, etc., while at the same time taking advantage of the benefits that USB provides. For instance, users need not concern themselves with resource issues existing on the ISA bus when adding new devices--selecting I/O address and IRQ.

Another advantage of USB is Plug-&-Play capability; the user merely plugs the device in and the computer immediately configures it. An additional user friendly feature is hot-swap capability; the computer need not be powered down before plugging in a new device.

The QSU-100 is completely compatible with USB specification 1.1. The adapter is bus powered, so no external power supply is needed. It is supported under Windows 98 and Windows 2000 will be released soon.

 Specifications  

BUS INTERFACE: USB specification 1.1

DATA RATE:

115.2 kbps

PORTS: 4

UARTs:

4 16550 UARTs with 16-byte FIFOs

CONNECTOR:

4 DB-9 male connectors

OS SUPPORT:  Windows 98. Support for Windows 2000 will be released soon.