The Devices - Pyronix PCX 46 APP Installation & Reference Manual

1.1 The Devices

All PCX peripherals; LCD keypads,
readers, expanders etc. are connected
via the D1-, D2+, D3 and D4 terminals.
This is an example of what a typical PCX
bus may look like.
General Principles:
NOTE 1: No alarm system cable should
be run with other cables carrying AC or
digital signals.
NOTE 2: The cables should be
protected by the use of grommets
where appropriate.
NOTE 3: For greater than 1000m range
a standard isolated RS485 repeaters
required.
NOTE 4: There MUST be a ferrite bead
fitted to one of the outgoing data lines
and secured inside the PCX case itself.
The Ferrite bead is supplied packaged
with a cable-tie which must be used to
secure it in the case and prevent it
shorting any electrical contacts (Ferrite
as shown).
There must also be a ferrite bead fitted
to the data wires of a PCX-EXT-BK/W (if
connected). The Ferrite bead is supplied
with the reader.
NOTE 5: (IMPORTANT!) 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.
PCX 46 App Installation Reference
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