Are RS485 Full-Duplex interface same with RS422 interface?
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RS-422 and RS-485 use the same electrical interface specification.
If you use that interface to build a bidirectional link on a single pair of wires, it's called RS-485, and it supports half-duplex operation.
If you use that interface to build two unidirectional links on two pairs of wires, it's called RS-422, and it supports full-duplex operation. This is sometimes mistakenly referred to as "full-duplex RS-485", but that's really a nonsense phrase.
RS-422 is a point to point communication connection. You can build it with one pair of wires to allow unidirectional communication between two parties (simplex, rarely used). With two pairs of wire it allows for bidirectional, duplex communication.
RS-485 is a bus structured communication setup that can potentially support multi master communication. It allows for multiple parties to communicate in full duplex if two pairs of wires are used. If only one pair of wire is present the communication flow is half duplex.