How does an iButton Communicate?

How does an iButton convey?

The iButton is a slave gadget and requires an expert to start correspondence to it. An expert can be a PC or a small scale processor. With the expert always surveying the iButtons, correspondence to iButtons can be begun by a straightforward touch to a 1-Wire interface called a Blue Dot Receptor. Each iButton has an interesting 64-bit serial number, which gives it a special 1-Wire system address.