I-o-display-systems Basic I/O Product Manual do Utilizador descarregar pdf (Página 58)

Installation 2

2-4(Vol.2)

RS-422:

Advantages:

Easier to implement in software since host driver need not be controlled.

Can be either Multidrop or Repeat.

No turn-around delay required.

Disadvantages:

Requires five conductor wire instead of three.

RS-485:

Advantages:

Needs only 3 wire conductor.

Disadvantages:

Host 485 driver control must be implemented requiring tricky serial port

manipulations.

Can only be Multidrop.

Usually requires turn around delay implementation.

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I-o-display-systems Basic I/O Product Manual do Utilizador Página 58