A latch control device includes a mounting seat and a locking cap device pivotably mounted to the mounting seat and pivotable relative to the mounting seat between a closure position and a non-closure position. Optionally mounted to the latch control device are a first accessory, a second accessory, a third accessory, a first escutcheon, and a second escutcheon. The latch control device is selectively assembled into a first mode (including a detecting device), a second mode (including the detecting device, the first accessory, and the third accessory), or a third mode (including the detecting device, the first accessory, and the second accessory) for cooperating with a cylindrical latch device, a first box type latch device, or a second box type latch device.