Manual LPCI-COM-8SM
5
Chapter 1: Introduction
This serial interface card was designed for effective multipoint transmission in any one of three
modes on each channel. These modes are RS232, RS422 and RS485 (EIA485) protocol.
The RS485 mode may be run in three manners. It may be run as a standard RTS controlled
channel, an “Auto RTS (referred to by some as Auto RS485)” mode or as a “4 wire RS485
mode channel.
The card is 6.60 inches long and may be installed in 3.3 or 5-volt PCI-bus slots of IBM PC or
compatible computers. The card features eight independent, asynchronous serial ports, type
16788 buffered UARTs.
This series of cards are available in 4-port and RS-232 only versions.
Features
•
Eight- or four-port RS-232/422/485 serial communications
•
High performance 16788 class UARTs with 64-byte FIFO for each TX and RX
•
Supports data communication speeds up to 921.6kbps
•
Software compatible with all operating systems
•
6’ breakout cable terminating with industry-standard DB9M connectors
Applications
•
POS (Point-of-sale) Systems
•
Gaming
Machines
•
Transportation
Stations
•
Telecommunications
•
Industrial
Automation
•
ATM (Automated Teller Machine) Systems
•
Multiple terminal control
•
Office
Automation
•
Kiosks
Functional Description
RS422 Balanced Mode Operation
The card supports RS422 communications and uses differential balanced drivers for long range
and noise immunity. The card also has the capability to add load resistors to terminate the
communications lines. RS422 communications requires that a transmitter supply a bias voltage
to ensure a known "zero" state. Also, receiver inputs at each end of the network should be
terminated to eliminate "ringing". The card supports biasing by default and supports termination
by jumpers on the card. If your application requires the transmitter to be un-biased, please
contact the factory.
