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Installateurshandleiding AlphaVision NG Rev. 2.0 27-08-2003 Blz. 11/112
standaard RS-485 maakt data-overdracht tot op 1200 meter mogelijk. Deze afstand kan echter alleen gehaald
worden, wanneer aan de volgende voorwaarden wordt voldaan:
voor de RS-485 bus wordt afgeschermde en 2 x 2 x 0,5mm2 getwiste kabel gebruikt, zoals door
Alphatronics geleverd wordt onder artikelnummer 008654
de RS-485 bus wordt van punt naar punt doorverbonden zonder aftakkingen. Alle aangesloten
apparaten zijn dus in directe lijn met elkaar verbonden zonder sterverbindingen.
Wanneer de aangesloten apparaten via de RS-485 bus van voedingsspanning worden voorzien, dan
mag de binnenkomende voedingsspanning in de slechtste omstandigheid (uitgevallen netspanning
en minimale accuspanning) niet beneden de 8,0 VDC komen. Uitgaande van een minimale
accuspanning van 10V komt dit dus neer op een maximale spanningsval van 2VDC over de kabel.
Het is ook mogelijk om extra bedrading met dikkere aders t.b.v. de voedingsvoorziening mee te
voeren.
Wanneer het aansluiten van apparaten in één rechte lijn niet lukt, dan is het wel mogelijk om
sterverbindingen te maken. Echter, de maximaal haalbare afstand neemt dan wel af en verschilt per situatie!
In het algemeen wordt aangeraden om de totale buslengte bij sterverbindingen niet langer te laten worden
dan 500m.
De ohmse weerstand van de door Alphatronics geleverde RS-485 kabel (008654) is circa 10 ohm per 100m.
Let op: tussen de A-lijn en de B-lijn wordt GEEN AFSLUITWEERSTAND aangesloten!
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