Spectrex 20/20R - Single IR Flame Detector - Manual (Page 53)

Spectrex Inc. - SharpEye TM Single IR Flame Detector Manual – TM 20/20R, Rev. A January2005
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Appendix C – RS-485 Communication Network
Using the RS-485 network capability of the IR detector and additional software it is
possible to connect up to 32 detectors in an addressable system with 4 wires only
(2 for power & 2 for communication). Using repeaters, the number of detectors can
be much larger (32 detectors for each repeater) 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.
Fore more details, consult the factory.
Figure 17: RS-485 networking