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RS full duplex point to point short distance(1 meter) atkbaud at least3 wires (more with handshake control) RS half duplex point to multi-point (master to multiple slaves) m distance atkbaud2 wire (RS uses4 wires)
_ point to point ,it has short range ,kind of meter , its3 wire
-full duplex, it has long rage ,m ,its2 wire
