The PCL-846 series cards provide four independent RS-422/485 serial
ports on a card. Each port has a 16C550 UART with an on-chip 16-byte
FIFO buffer for reliable, high-speed serial I/O. The UART buffers data
into 16-byte packets before putting it on the bus. This drastically
reduces the CPU load and avoids data loss when the system is busy and
cannot process the interrupt quickly. The UART is especially useful for
high speed serial I/O under Windows.
Features:
Four independent
RS-422/485 serial ports
Transmission speeds up to 921.6 kbps
Independent/shared IRQ settings
between each of the 4 serial ports
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