Abstract: A transmitter interface board for integration with a conventional environmental condition detector (such as a smoke detector, carbon monoxide detector etc.), for transmitting information on the operating status of the detector to a remotely located monitoring facility. The transmitter interface is connected to a detector circuit in the condition detector in a manner such that the interface can detect alarm pulses emitted from the detector. Based on the number of alarm pulses emitted in a pre-defined interval the transmitter interface is able to determine the operating status of the detector. The operating status information is then be sent by a transmitter to the central monitoring facility.