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Modules are for various purposes.

Dual Input Module (Contact / Monitor Module) H22
Dual Input Module (Contact / Monitor Module) H22
Characteristics And Benefits： H22 Dual Input Module is used for monitoring any of NO contact signals of the field devices, like the water-flow indicators, signal valves, pressure switches, etc.When it acted, it transmits the signal received from the Fire Alarm Control Panel via the Bus line, showing the location of the signal and lighting the alarm indicator on the module meanwhile.H22 Dual Input Module occupies 2 addresses and has 2 Input contact signals.
Loop powered Isolation Module H15
Loop powered Isolation Module H15
Characteristics And Benefits: Short circuit and over current protectionLoop powered
I/O Module (Relay Module) H11
I/O Module (Relay Module) H11
Characteristics And Benefits: The H11 I/O Module receives the programmed commands from the Control Panel and controls 1 group of the Output signals: NO or NC signal, in order to start the field linkage equipment. It receives Feedback signal sent by the linkage equipment after action and transmits the signal of Started and Feedback back to the Control Panel showing the location of the signal, meanwhile lighting the LED indicator.
Input Module (Contact / Monitor Module) OM812
Input Module (Contact / Monitor Module) OM812
Characteristics And Benefits： OM812 Input Module is used for monitoring any of NO contact signals of the field devices, like the water-flow indicators, signal valves, pressure switches, etc.It transmits the signal received from the Fire Alarm Control Panel via the Bus line, showing the location of the signal and lighting the alarm indicator on the module meanwhile. 
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