
5.
If an expansion module with a power supply on board is connected, the D2+ terminal must
not be connected between the main bus and module.
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 fragmented 230V
AC mains power line
300 m
1000m
For greater than 1000m
range, standard isolated
RS485 repeaters are
required.
50 m
6 core alarm cable
doubling D1 (0V) and D2
(12V)
1000 m
Twisted pair
1000 m
Figure 2: Star Wiring example
PCX Installation Guide
102017852 - V01
13
Summary of Contents for PCX 78
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