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Gebruikershandleiding voor network speed dome 5 inch
63
de weerstand.
Afbeelding 3
4. Problemen bij praktijktoepassing
Normaliter zetten gebruikers een sternetwerk op. In dat geval moeten de afsluitweerstanden worden aangesloten bij de twee verst
verwijderde apparaten (in afbeelding 4 zijn dat 1# en 15#), maar deze aansluitmethode voldoet niet aan de eisen in de
RS485-industriestandaard. Daarom treden er problemen op als signaalreflecties en minder onderdrukking van stoorsignalen bij
apparatuur op grotere afstand. De dome is dan niet meer te bedienen of gaat zelfstandig handelen.
Afbeelding 4
In zo'n geval is de beste oplossing het toevoegen van een RS485-distributor. Dit product kan een stervormig communicatienetwerk
effectief aanpassen zodat het voldoet aan de eisen in de RS485-industriestandaard. Dat voorkomt de genoemde problemen en verbetert
de betrouwbaarheid van de communicatie. Zie afbeelding 5.
Afbeelding 5
64


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