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RS-422 or 4-Wire RS-485 working model with termination resistor:
2-Wire RS-485 working model with termination resistor:
SUNIX RS-422/485 PCI 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.
Note: Stands for termination resistor near the receiving side.
Manufactory default jumper setting is OPEN (disable 120 ohms termination
resistors across the two wires).
SUNIX Host Card Device
D + (Tx+)
D – (TX-)
D +
D –
SUNIX Host Card Device
Tx +
Tx –
Rx +
Rx –
Rx +
Rx –
Tx +
Tx –
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