Spectrex 20/20MPI - Commercial IR3 Flame Detector - Manual (Page 17)

TM 20/20MPI, Rev (D) September 2013
Principles of Operation 5
2.2.5 Modbus RS-485
For more advanced communication, 20/20MPI has a RS485 Modbus
compatible output that provides data communication from a network (up to
247 detectors) to a host computer on universal controller, for central
monitoring. This feature enables easy maintenance local and remote
diagnostic tools.
2.2.6 Types and Models
The 20/20MPI has two models:
 20/20MPI-R: Relay output
 20/20MPI-M: 0-20 mA output (stepped)
Figure 1: Flame Detector Assembly - Outline Drawing