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Gebruikershandleiding voor 5-inch high speed dome
© Hikvision Digital Technology Co., Ltd. Alle rechten voorbehouden.
38
Afbeelding A - 1 Beveiliging tegen bliksemontlading en stroompieken
Appendix 2 RS-485-bus aansluiten
Algemene eigenschappen van RS-485-bus
Volgens de industriebusstandaard is de RS-485 een half-duplex communicatiebus met een
impedantie van 120 Ω en een belasting van maximaal 32 payloads (inclusief controller en bestuurd
apparaat).
Transmissieafstand voor RS-485-bus
De volgende tabel geeft de maximale transmissieafstand, afhankelijk van de baudrate, bij gebruik
van 0,56 mm (24AWG) twisted-pair bedrading:
Tabel A-1 Maximale afstand voor RS-485-transmissie
Baudrate
Maximale
afstand
2400 bps
1800 meter
4800 bps
1200 meter
9600 bps
800 meter
De transmissieafstand wordt kleiner bij het toepassen van dunnere kabel of bij het werken in de
directe omgeving van sterke elektromagnetische velden. De transmissieafstand neemt toe als er
minder apparatuur op de bus wordt aangesloten.
Verbindingsmethoden
De RS-485-standaard vereist doorgelust aansluiten van apparatuur, met aan beide uiteinden van
de keten een afsluitweerstand van 120 Ω (zie afbeelding 1). Afbeelding 2 toont de simpele
aansluitmethode, maar daarbij mag de afstand 'D' niet te lang zijn.
44


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