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• Four independent RS-232, RS-422 or RS-485 serial ports
• Each port is individually configurable to RS-232, RS-422 or RS-485
(Jumper selectable)
• 16C550 UARTs for PCL-746+
• Speed up to 115 Kbps
• Complete RS-232 modem-control signals
• Up to two cards for a total of eight ports in one system
• Interrupts jumper selectable, IRQ 3, 4, 5, 7, 9, 10, 11, 12 or 15
• On-board interrupt status register for greater throughput
• Compatible with standard PC ports: COM1, COM2, COM3 or COM4
• RS-422 or RS-485 modes jumper selectable
• Automatic data flow control in RS-485 mode
• Supports 2-wire or 4-wire RS-422/RS-485 operation
• Space reserved for terminator resistor
• Space reserved for optional surge protection on all port lines
(RS-422/RS-485 mode only)
• LED indicators on each port indicate data flow
• Compatible with Arnet 4-port cards supporting SCO UNIX/XENIX
Chapter 1 Introduction 3
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