Pyronix PCX 78 User Manual

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

Pyronix PCX 78 Specifications

General

Brand	Pyronix
Model	PCX 78
Category	Security System
Language	English