Circutor computer SMART III-Fast Series Manual do Utilizador descarregar pdf (Página 58)

4�9�-RS-485COMMUNICATIONS

Computer SMART III FASTunitshaveanRS-485serialcommunicationoutputwiththeMod-

bus RTU ®communicationsprotocol

4�9�1� CONNECTIONS

TheRS -485cableshould be wiredwith a twistedpair cable withmesh shield (minimum3

wires),withamaximumdistancebetweentheComputer SMART III FASTandthemasterunit

of1,200metres�

Amaximumof32Computer SMART III FASTunitscanbeconnectedtothisbus�

UseanintelligentRS-232toRS-485networkprotocolconverter(M54020intelligentconverter)

toestablishthecommunicationswiththemasterunit�Thisconverterdoesawaywiththeneed

forthePin7connectionontheRS-485side�

B ( - )

A ( + )

A( + )

B( - )

RS-232 / USB / Ethernet / Profibus ...

RS-485

RS-232

USB

Ethernet

Profibus

...

Figure 16: RS-485 Connection diagram�

Computer SMART III FAST

Instruction Manual

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Circutor computer SMART III-Fast Series Manual do Utilizador Página 58