DETECTING SYSTEM FOR DETECTING INSERTION OF EXPANSION CARD

摘要

A detecting system includes a slot, a controller and a power source terminal. The slot includes a first detecting pin and a second detecting pin. The first detecting pin is electrically connected to a detecting voltage terminal. The second detecting pin is connected to ground. The controller is electrically connected to the first detecting pin. The controller receives a high level voltage signal from the first detecting pin when an expansion card is not detected. The power source terminal is connected to the slot under control of the controller. On the condition that the first detecting pin is electrically connected to the second detecting pin. The controller receives a low level voltage signal from the first detecting pin. The controller is then triggered to connect the power source terminal to the slot to supply power to the expansion card.