Spectrex 40/40R - Single IR Flame Detector - Manual (Page 65)

RS-485 Overview 53
C RS-485 Communication Network
In this appendix…
RS-485 Overview page 53
C.1 RS-485 Overview
By using the RS-485 network capability of the detector and additional
software, it is possible to connect up to 32 detectors in an addressable
system with four (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 four (4) wires. When using the
RS-485 network, it is possible to read each detector status (FAULT,
WARNING, and ALARM) and to initiate a BIT to each detector individually.
For more details, consult Spectrex.
Figure 13: RS-485 Networking