Quatech QSP-200/300 - Manual (Page 7)

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 1