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1.2.2
RS-485 Wiring
Cable type
Screened Cable
Bus range (m)
Wiring Format
Daisy Chain Range
Star Range
4 core alarm cable
Use when bus
located near
230VAC mains
power line
300m
1km 50m
6 core alarm cable
doubling D1 (0V) and
D2 (12V)
1000m
Twisted pair
1000m
Star Wiring
Diagram
(Example #1)
Daisy Chain Wiring
Diagram
(Example #2)