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Optical Isolation
PCI Quad 422/485 Card
For further details on the RS422 and RS485 standard, pinouts, half duplex and
full duplex RS485 systems, wiring diagrams and optional grounding diagrams
refer to Chapter 10 - "Optional RS422/485 Operation."
The PCI Quad OPTO RS422/485has optical isolation circuitry on board that
allows protection of:-
1500 Volts DC
! 1000 Volts AC
This Isolation present on board also allows greater protection from current
surges, lightening strikes to both the card itself and the PC. It also improves
noise immunity by isolating the PC from the cards transmit ground.
Chapter 2 Hardware Configuration
10
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