Table of Contents
Advertisement
PCI Velocity RS232422/485
PCI VELOCITY RS232/422/485
HARDWARE SETUP
Introduction.
This chapter details the specifications of the PCI Velocity
RS232/422/485 card and explains how to configure the RS485
Multiplex jumpers present on this card. This half-sized card will
work happily in any PCI 2.0 or greater compliant PC compatible.
PCI RS232/422/485 Card Features.
One 9 pin D RS422/485 serial port.
One 9 pin D RS232 serial port.
Reliable communications up to 4000 feet, 1.2 Kilometers.
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
Autogating low level RS485 half duplex (2 wire) control
Fully double buffered for reliable asynchronous operation.
High-speed integrated circuitry ensures operation with fast PC's
e.g.700 MHz Pentium III WITHOUT extra wait states.
Chapter 2
Chapter 2 Page 11
HARDWARE SETUP
Advertisement
Table of Contents
