Physical Links

RS 232 is peer to peer connection
RS –stands for recommended standard
RS232-fullduplex 3 wire (transx,recievx,signal ground)
It support one master one slave
Its work like hand shaking principle(send & receive alternatively)
It communicate up to 15mts

RS422 is extension of RS232
Full duplex 4 wire (T+, T-, R+, and R-)
It support (communicate)upto 10 devices
It communicate up to 1200mts


RS 485 half duplex 2 wire (D+, D-)
It support up to 31 devices
It communicate up to 1200mts

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