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CHAPTER 1 The PCCOM PCI bus 2 port RS422/RS485 with isolator
adapter is an 32
bits PCI bus board with Plug and Play (PnP) features, it provides two
asynchronous serial communication ports (RS422/RS485), which link the
computer
and serial peripheral devices such as terminals, modems, serial
printers,
plotters, ... etc. The on board isolator can isolate
voltage up to 2500V r.m.s.. The PCCOM PCI bus 2 port adapter is particularly suited
to
facilitate the connection of terminals (VDUs) in multi-user operating
systems.
The PCCOM board may be installed in any Pentium or hardware compatible
systems.
The PnP features let hardware configuration for IRQ and I/O address is
detected
by BIOS automatically, you don’t need set switch and jumper. Since most of
the computer has its own COM1 and COM2, the PCCOM PCI bus 2 port
adapter can be
configured from COM4. On
board 16550 chip provides two 16550 functions which contains 16 bytes
FIFO
buffer for each 16550 ports. There are two kinds of mode can be choose,
one is
normal speed mode that its baud rate up to 115200, another is high
speed mode
that its baud rate up to 460K.
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