In DACS, the digital dialer transmits to the central station what information?

• A. The change in condition at the protected premises
• B. The time of day
• C. The identity of the technician
• D. The weather

Answer: (A)

In this area, the key idea is that alarm communication systems send signals that reflect actual events at the protected premises. A digital dialer is meant to convey what has changed, not a running stream of unrelated details. So it reports the change in condition—when a sensor is tripped, a door or window state changes, a sensor returns to normal, or a fault occurs—so the central station can interpret what happened and respond appropriately. It’s not about the time of day, who the technician is, or weather; those aren’t the focus of the alert signal. The central station relies on these change-of-state messages to determine the correct action, such as dispatch or monitoring adjustments.