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Specifications
PCI VELOCITY RS422/485 &
PCI OPTO ISOLATED RS422/485
SPECIFICATIONS
Introduction.
This chapter details the specifications of the PCI Velocity
RS422/485 card and PCI Opto Isolated RS422/485 and explains
how to configure the RS485 Multiplex jumpers present on both
cards. These half-sized cards will work happily in any PCI 2.0 or
greater compliant PC compatible.
Note: The PCI Velocity RS422/485 is identical to the PCI
Optically Isolated (Opto Iso) RS422/485 with regard to software
installation in all operating systems. The only difference is the
presence of the Optical isolation circuitry on the Opto Iso card,
which is detailed below.
General PCI RS422/485 Card Features.
Two independent 9 pin D RS422/485 Serial ports.
Reliable communications up to 4000 feet, 1.2 Kilometres.
16C750 FIFO provides 64-byte input and 64-byte output buffer
on each port.
Maximum baud rate of 921,600 Baud (1 Megabaud).
Word length of 5, 6, 7 or 8 bits.
Even, Odd, None, Mark or Space parity options.
1 start bit always sent.
1, (1.5 for 5-bit data word length), or 2 stop bits.
TXD, RXD, RTS, and CTS signals.
RS485 TXD/RXD multiplex selectable by jumpers: - either
FULL DUPLEX or HALF-DUPLEX.
Fully double buffered for reliable asynchronous operation.
High-speed integrated circuitry ensures operation with fast PC's
e.g. 333 MHz Pentium II WITHOUT extra wait states.
PCI VELOCITY / OPTO ISO RS422/485
Chapter 2
Chapter 2 Page 6
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