PCI 1 Port RS422/485
Hardware Setup
Chapter 2 Page 10
Chapter 2
PCI 1 PORT VELOCITY RS422/48
HARDWARE SETUP
Introduction.
This chapter details the specifications of the PCI 1 Port
Velocity RS422/485 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.
General PCI RS422/485 Card Features.
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One 9 pin D RS422/485 serial port.
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Reliable communications up to 4000 feet, 1.2 Kilometres.
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16C750 FIFO provides 64-byte input and 64-byte output buffer
on each port.
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Maximum baud rate of 921,600 Baud (1 Megabaud).
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Word length of 5, 6, 7 or 8 bits.
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Even, Odd, None, Mark or Space parity options.
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1 start bit always sent.
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1, (1.5 for 5-bit data word length), or 2 stop bits.
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TXD, RXD, RTS, and CTS signals.
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RS485 TXD/RXD multiplex selectable by jumpers: - either FULL
DUPLEX or HALF-DUPLEX
•
Autogating low level RS485 half duplex (2 wire) control
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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.
