Installation, Operation & Maintenance Manual Merlin Gas Detector-X
DETX-IOM Iss: 7 02-21
8
Detector Chain ID Switches
When wiring multiple detectors in a chain it is important to identify
each and every detector installed for the control panel to receive and
display accurate data corresponding with the correct detector type.
The ID configuration diagram is printed onto detector boards for quick
reference. All detectors are factory set to ID1.
ID Switches must be configured for each and every
detector connected to receive and display accurate data!
We recommend a plan, map and/or marking the detector enclosures detailing ID and location!
120ohm Termination Resistance
Signal communication issues may occur where the bus length is too long, high
baud rates are used or signal reflections are occurring.
To avoid this, terminating at each end of a chain may help the quality of the data
signal by turning on the 120ohm terminal resistor switch.
If a split chain is used, terminate the last detector in each chain.
If a single chain is used, terminate the first device (Panel) and last device (Detector).
Split chain Single chain
Quick Circuit Test
Access to the interior of the control panel or detector, when carrying out any work, must only be
conducted by trained personnel.
This does not test the gas sensing element itself.
When the test button on the circuit board is pressed and held the detector will simulate an
open circuit to ensure configured systems, outputs, alarms, indications and other external
devices operate as intended in response to gas.
When the test button is released – the test sequence will terminate and return to normal
operation.
