Spectrex 40/40L-LB UV/IR Flame Detector Series - 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 UV/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 14: RS-485 Networking