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an On-Line/Power LED
the Simplex 2190-9155 provides status monitoring and supervision of an initiating device circuit zone and are used for circuits with non-addressable detectors and for other contact closures such as waterflow and tamper switches or non-addressable manual stations
Addressable-analog communication
Separate I/O and data loop connections are made to each module
The System Sensor M500X Isolator Module is an automatic switch that opens when the line voltage drops below four volts
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