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  RS-422/485 Wiring Topology  
 
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RS-422 4-Wire Full Duplex (Point-to-Point)

 

RS-485 2-Wire Half Duplex (Point-to-Point)

 
RS-485 2-Wire Half Duplex (Multi-Drop)
 
RS-485 4-Wire Full Duplex (Multi-Drop)
 
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