Spectrex 20/20MU - Mini Flame Detector - Manual (Page 45)

Spectrex Inc. - SharpEye TM ML & MU Flame Detector Manual – TM 767100, Rev. A, April 2005
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RS-485 Communication Network
Using the RS-485 network capability of the IR 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 12: RS-485 Networking