A shortened supervised detection circuit will cause the terminal to go:

When a supervised detection circuit is shortened, it typically results in the terminal going "down." In the context of alarm systems, a shortened circuit indicates that the expected voltage or signal levels have been altered due to a direct connection or fault condition. This change essentially means that the resistance in the circuit has decreased significantly, often triggering a state that is interpreted as a fault or alarm condition.

Supervised circuits are designed to monitor the integrity of the circuit itself; they should maintain a specific operational state unless an event, like a short, occurs. In this situation, the circuit sees the unforeseen low resistance and responds by signaling that something is wrong, thereby bringing the system "down." This is crucial for maintaining the system's reliability and for alerting users to potential issues that need resolution.