A coded supervisory signal is permitted to consist of how many rounds to indicate a supervisory off-normal condition?

In fire alarm systems, supervisory signals are critical for indicating non-normal conditions that require attention, even if they are not urgent like alarms. A coded supervisory signal typically conveys specific information about the state of the system.

The standard convention permits a coded supervisory signal to consist of two rounds to indicate a supervisory off-normal condition. This two-round sequence is essential for clear communication and helps distinguish the supervisory alert from other operational signals. By using two rounds, it ensures that monitoring personnel can easily recognize and prioritize the supervisory condition without confusion with other signals which may have different codes.

The design of supervisory signals, including the round sequences, is guided by various protocols and standards governing fire alarm systems to enhance their reliability and efficiency in communicating system status. In this context, the two-round signal serves as a concise and effective method for conveying that there is a need for further investigation or action related to the supervisory condition.