Spectrex 40/40M Multi IR Flame Detector - Manual (Page 67)

RS-485 Overview 55
C RS-485 Communication Network
➣ In this appendix…
RS-485 Overview page 55
C.1 RS-485 Overview
By using the RS-485 network capability of the Multi IR 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 15: RS-485 Networking