... If base is set on message. 3). Use input port I1, I2, I3 to make alarm When you connect ... input port I1 to the ground, the alarm function will initiate, ... if base is set on message. When you connect input port I2 to the ground, the alarm function will initiate, ... if base is set on message. When you connect input port I3 to the ground, the alarm function will initiate, ...