International Gas Detectors TOC-635, Installer'S Manual

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Gas Detector Connection
The most commonly supplied detector node comes pre-fitted with a gas detector. The
detector front assembly simply plugs onto the indicated connector. Note that all detector front
assemblies have a common system address. The detector node module is designed to read
the data from this address and report it back to the control panel using its own ‘unique’
address.
This makes service replacement very simple as the detector assembly is pre-calibrated and
can just be plugged in to enable operation.
If detector modules are changed to add or change the detected gas type then the controller
will need to be amended so the channel reads and scales correctly and so that alarm levels
are appropriate.