Four Channel RS-422/483 Serial PCMCIA Card Four independent serial interfaces Configurable for RS-422 and RS-485 PCMCIA Card Services Specification 2.1 compliant Client software driver for DOS and OS/2 Windows 95/98 and Windows 2000 compatible 16550 UARTs with 16-byte FIFOs standard Selectable and shareable interrupts Selectable I/O base address
The QSP-200/300 Type II PCMCIA card adds four fully independent serial ports to the system. Each port can be configured as RS-485 by using a 60 Ohm resistor, or as RS-422 by connecting an 100 Ohm resistor. Any combination of RS-422 and RS-485 ports can be used. The serial ports are implemented with 16550 UARTs providing 16-byte transmit and receive FIFOs, making the QSP-200/300 ideal for use in multi-tasking environments. The RS-422/485 serial ports can be configured to operate in either Full-Duplex or Half-Duplex mode (but all ports must operate in the same mode). The default is Full-Duplex operation with the RS-422/485 output drivers always enabled. Half Duplex mode may be selected via software configuration. (However, under Windows environments, only point to point communication is supported, not multi-drop networks and half duplex options.) In Half Duplex mode the RS-422/485 transmitter may be enabled and disabled via the RTS or DTR signals, both of which are controlled through the Modem Control Register on the UARTs. The QSP-200/300 also provides the option for an RTS-CTS modem control handshake.
The QSP-200/300's four serial ports must be located on an even 32-byte (20H) boundary, and users may select on which I/O address space the card will be located (eg. 300H, 320H, 240H, etc.). Both ports can also share a single interrupt using an interrupt status register to indicate which of the ports triggered the interrupt.
All necessary software is included to install and configure the QSP-200/300 for use with DOS, OS/2, Windows 3.x, Windows 95/98 and Windows 2000.