KTI Networks KSC-240 Przewodnik Instalacji Pobierz pdf (Strona 38)

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3.4 RS-485 Half-duplex 2-wire Network

This is the typical RS-485 topology. It takes advantage of RS-485 capabil-

ity to support multiple drivers on a bus. RS-422 devices should not be

used in this configuration. This topology enables bidirectional communi-

cation from many nodes over long distances at low to medium data rates,

all on a single pair of wires (2-wire).

It can implement a very functional, very flexible and very economical data

network. Because signals travel in both directions, this bus should be

terminated at both ends to prevent reflections. Only one node can drive

the bus at a time, making this a half-duplex communication channel. Only

one driver should be active at any one time. Therefore the transceivers

used on a half-duplex bus should support a Driver Enable function.

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KTI Networks KSC-240 Przewodnik Instalacji Strona 38