User`s manual

1 Introduction
The Quatech QSP-200/300 provides four independent RS-422/485 asynchronous serial
communications interfaces for systems equipped with PCMCIA Type II and/or Type III
expansion sockets. The QSP-200/300 is a PCMCIA Type II (5 mm) card and is PCMCIA
PC Card Standard Specification 2.1 compliant.
The QSP-200/300's serial ports are implemented using 16C550 Universal Asynchronous
Receiver/Transmitters (UARTs) which are the recommended communications interface
for multitasking environments and with applications involving high data transfer rates.
The QSP-200/300's four serial ports are addressed in a single 32 byte I/O block for
simplified programming and all four channels share a common interrupt (IRQ). A
special interrupt status register is also available to simplify the software required to
service multiple serial ports in an interrupt driven environments.
QSP-200/300 User's Manual 2