Specifications

12
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED
2.3 Factory-Default Settings
When shipped from the factory, the PCI Card’s DB9
ports are configured as RS-422.
To install the PCI Card using factory-default settings,
refer to Chapter 4.
2.4 Technical Description
The RS-232/422/485 2-Port PCI Card, Opto-Isolated
provides a PCI interface adapter with two isolated
asynchronous serial ports that give you a versatile
interface, field-selectable as RS-232 for modems, printers
and plotters, as well as RS-422/485 for industrial
automation and control applications. Isolation is
important in installations where the equipment being
connected to the PC is either far from the PC, or on a
different power transformer circuit. Ground loop
current is a commonly neglected and misunderstood
phenomenon that leads to data loss and the destruction
of communications interfaces.
The PCI Card uses the 16850 UART. This chip features
programmable baud rates, data format, interrupt
control, and industry-leading 128-byte FIFOs.