Spectrex 20/20MI - Mini Triple IR (IR3) Flame Detector - Manual (Page 47)

Spectrex Inc. - SharpEye TM Mini IR3 Flame Detector Manual – TM 787100, Rev. D April 2011
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RS-485 Communication Network
Using the RS-485 network capability of the IR3 detector and control software, it is
possible to connect up to 32 detectors in an addressable system with 4 wires only
(2 for power and 2 for communication). Using repeaters, the number of detectors
can be much larger (32 detectors for each repeater) up to 247 on the same 4
wires. When using the RS-485 network, it is possible to read each detector status
(FAULT, WARNING, ALARM) and to initiate a BIT to each detector individually.
For more details, consult the factory.
Figure 10: RS-485 Networking