Quatech QSC-100 - Manual (Page 6)

1 General Information
The Quatech, Inc. QSC-100 provides four RS-232 asynchronous serial
communication interfaces for IBM-compatible personal computer systems using the
PCI expansion bus. The QSC-100 uses Quatech's new Enhanced Serial Adapter design.
Legacy serial port data rates are limited to a maximum of 115,200 bits per second.
Quatech Enhanced Serial Adapters can achieve data rates as high as 921,600 bits per
second.
As a PCI device, the QSC-100 requires no hardware configuration. The card is
automatically configured by the computer's BIOS or operating system. The four serial
ports share a single interrupt line and are addressed in a contiguous block of 32 bytes.
A special interrupt status register is provided to help software to manage the shared
interrupt.
The QSC-100's serial ports are using 16750 Universal Asynchronous
Receiver/Transmitters (UARTs). These UARTs contain hardware buffers (FIFOs) which
reduce processing overhead and allow higher data rates to be achieved. The 16750
contains a 64-byte FIFO and can transmit and receive data at a rate of up to 921,600 bits
per second and is recommended for heavy multitasking environments and for
applications involving high data rates. The larger FIFO allows each read or write
access to the UART to move more data, resulting in fewer interrupts and less processor
time spent servicing the UART.
The QSC-100 is supported under several popular operating systems and
environments. Contact the sales department for details on current software offerings.
Most device drivers are available for download from the Quatech world wide web site
at http://www.quatech.com. Quatech serial device drivers for Windows 95, Windows
NT, 98, 2000, Millennium and OS/2 provide support for the UART's 16750 mode.
Quatech QSC-100 User's Manual 4