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Jumper Settings
RS-422 or 4-wire RS-485 working model with
termination resistor
2-wire RS-485 working model with termination
resistor
This RS-422/485 PCI Express Serial board equips
independent TX and RX termination resistors for
each serial port. User can modify the jumper
setting (short the pins) to avoid impedance
mismatched problem when operate under Multi-
drop transmission. Resistors should be added
near the receiving side.