Wiring A Detector (Gdp2X Or Gdpx+ Control Panel); Creating A Detector Chain - CGS Merlin 'S' Range Installation, Fonctionnement Et Entretien

Installation, Operation & Maintenance Manual

Wiring a Detector (GDP2X or GDPX+ Control Panel)

24vdc power supply from the control panel and communication cables are wired to control panels (GDP2X or
GDPX+). Both control panel and detector terminals are marked as [DETECTOR CHAIN + - D+ D-].
[SHEILD WIRE] detector terminals should be used for earthing/grounding and shield wires connected to any
Earth/Ground terminal on the control panel. Twist the shield wire to avoid stray shield wires,
If you are encountering noise or irregular problems with a bus link, the problem is likely related to grounding,
incorrect shielding or wiring mains power cables next to data cables.
The detector must be earthed/grounded for electrical safety and limit the effects of R/F & EMC interference!
Where cable runs may exceed 100 yards from one control panel – Contact your supplier!
Ensure the 120-ohm termination resistance switch is turned on at each end of a cable run!

Creating a Detector Chain

Create a detector chain by connecting detectors in a parallel (daisy chain) method.
Any other way may cause issues or damage to the overall system. Resistor switches should be turned on at each end
of a chain – see section '120ohm Termination Resistance'.
Single Detector Chain from
Control Panel example.
IOM Iss: 4 11-21
A shielded and twisted 2 or 4 core cable is used to wire the MODBUS
terminals [D+ & D-). The shielding can be of 2 types: braided [mesh of thin
conducting wires] or foil (consisting of a thin sheet of metal covering the
twisted wires). One example of such cable is BELDEN 3082A. Any cable with
similar characteristics can be used to connect all the devices together.
Merlin Detector-TFT
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