MorphoWave Compact - 2018_2000035853-v81
RS485 Rx/Tx non inverting signal (A)
RS485 Rx/Tx inverting signal (B)
Figure 29: Serial port wiring – RS485
RS485 implementation is limited to half-duplex communication. So only Tx+, Tx- and ground reference
signals are necessary.
Depending on the RS485 network, an impedance adaptation may be required.
For farthest terminal, a 120-Ohms resistor termination may be added outside the terminal between TX+
and TX-.
RS422
RS422 non inverting Receive
RS422 non inverting Transmit
Figure 30: Serial port wiring – RS422
RS422 interface is a full duplex communication.
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