Often, terms like ''
RS-485'', ''USB'' and ''
Ethernet'' are interchanged as if they could be switched and do the
same job. But in fact, the
RS-485 standard is only a physical layer standard. It defines the electrical characteristics of the transmitter and the receiver.
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RS485 needs 3 conductors and a shield. Many people say its a two wire network but it is not. Two conductors are used to carry the RS485 Differential voltage signal.
