Spectrex 20/20SH - Hydrogen Flame Detector - Manual (Page 51)

Spectrex Inc. - SharpEye TM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005
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Appendix C – RS-485 Communication Network
Using the RS-485 network capability of the Hydrogen 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) 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.
Fore more details, consult the factory.
Figure 17: RS-485 networking