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Installation & Operation Manual
Gas Detector Setup
12-24Vdc power and modbus RTU communication data is wired to gas detectors.
Up to 8 detectors can be connected, chained in parallel up to approx. 100 metres from the
panel depending on chain configuration, wire type for power and condition.
For MODBUS DATA communication, a shielded and twisted 2 or 4 core cable is used.
Any cable with similar characteristics can be used to connect all the devices together.
Connect detectors in a parallel (daisy chain) method for bus data signal.
Any other way may cause issues or damage to the overall system.
**Single chain example.
**Split chain example
**Where connections may exceed 100 metres from one control panel – Contact your supplier!
For more information refer to your detector manual!
GDP2X - IOM Iss: 5 06-20
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). If you are encountering noise or
irregular problems with a modbus link, the problem is likely
related to grounding, incorrect shielding or wiring mains
power next to Modbus wiring.
Merlin GDP2X
7
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