Quatech QSC(LP)-300 user manual Termination Resistors, RS-422/485 Termination

6.7 Termination Resistors

No termination resistors are provided on the ports. Both output and input signals are connected only to the external connector. Any termination which is required must be added externally.

RS-422/485 Receiver

+RXD+ Rt

-RXD-

RS-422/485 Receiver

+AUXIN+

Rt

-AUXIN-

Recommended Termination Resistor Values

RS-422	RS-485
100 ohm 1/2W resistor	60 ohms total resistance
	(120 ohms at each end)

Figure 6. RS-422/485 Termination

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