How to check status of Smoke or Heat Detectors | Explanation about Status of Fire Alarm Devices

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hello guys,you can learn how to check status of fire alarm devices and understand the terms mentioned in status of fire alarm devices.
LB = Loop breaker is just a loop isolator which opens up when short circuit happened in loop.it is closed in normal condition and it is closed in fault condition.
End 1 = High= means supply available at input terminal of fire alarm device.
End 2 = High= means supply available at output terminal of fire alarm device.
End 1 = Low = means voltage supply is not available at input terminal of fire alarm device.
End 2 = Low = means voltage supply is not supply available at output terminal of fire alarm device.
analog channel details
channel 1 for Smoke detectors and Interface unit
channel 2 for heat detectors
channel 6 for Manual call points