6
Operation and Programming Concepts
The MRI-M500S control module can be used to control a supervised output, such as a bell or
strobe circuit. The control module monitors the circuit wiring and troubles will be reported. The
module will require a separate 24 VDC supply for the controlled circuit. When programming
the database in MHI, be sure to program the control module correctly. Choose any “Control
(str)” other than “Control (relay)” for the MRI-M500S module. The MR-2400 will not operate a
control module if the supervised circuit is shorted. Also there are options in MHI that affect the
MRI-M500S control module but not the MRI-M500R relay module.
The MRI-M500R relay provides two Form C relays. Choose “Control (relay)” for the MRI-
M500R module. There are options in MHI that affect the MRI-M500R relay module that do not
affect the MRI-M500S control module.
The MRI-M500X isolator module is used to prevent wiring faults from affecting the entire
circuit. It divides the addressable circuit into sections. The isolator has separate IN and OUT
wiring. A short on one side of the isolator is not seen on or affects the other side. Isolator
modules do not use addresses. The isolator relies on a voltage threshold to determine
whether it should be isolating or not. This voltage threshold is around 6.5V. All isolators in a
system are in isolated mode on system power up. If there is an excess of current draw, the
isolator will not close. When the short is removed, the isolator module automatically closes the
circuit again. The LED on the isolator module turns on when the module is in isolated mode,
otherwise it flashes periodically. System Sensor recommends no more than 25 devices
between isolator modules since the inrush current of the devices may mimic a short condition
preventing the isolator from closing.
Sensors
MRI-1251 Ionization type smoke detector, low profile
MRI-1551 Ionization type smoke detector
MRI-2251 Photoelectric type smoke detector, low profile
MRI-2551 Photoelectric type smoke detector
MRI-2251T
Photoelectric type smoke detector c/w heat detector,
low profile
MRI-2551TH Photoelectric type smoke detector c/w heat detector
MRI-2251TMB Acclimate Photo-Thermal Detector
MRI-5251 Fixed temperature detector, low profile
MRI-5251H Fixed high temperature detector
MRI-5551 Fixed temperature detector
MRI-5251R Rate of Rise and fixed temperature detector, low profile
MRI-5551R Rate of Rise and fixed temperature detector
MRI-7251 Pinnacle Laser
MRI-992A Photo Detector
MRI-995A Thermal Detector
MRI-M900CA Control Module
MRI-M900MA Monitor Module
MRI-M902MA Interface module
MRI-M900XA Isolator Module
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