Abstract: A monitoring device (6,10) monitors the functioning of a reporting system (1). The reporting system (1) includes a plurality of reporting devices (4) and/or signaling devices, supply lines (3), and a voltage source. The reporting devices (4) and/or signaling devices are connected to the voltage source via the supply lines (3), and the reporting devices (4) and/or signaling devices are connected in parallel to one another and to the voltage source. A test signal device (6) connects a reference resistor (R) into the supply lines (3) in parallel with the reporting devices (4) and/or signaling devices, and/or connects the reference resistor (R) as a termination of the supply lines (3). An evaluation device (10) detects and evaluates the system response of the reporting system (1) to the connecting of the reference resistor (R).

Abstract: Reporting systems, such as fire alarm systems, alarm systems or the like, are usually used for communications equipment in large plants, wherein automatic or manual reports are produced at decentralized locations and are forwarded to a central control system. To this end, the reporting systems comprise a plurality of reporting units connected to one another and to the central control system by way of signal lines and/or power supply lines. In a distributed embodiment, the power supply and signal lines are combined in a two-wire line, wherein the change in current flow and voltage in the two-wire line is monitored and a report is produced in the central control system when changes occur.