All 1-Wire® devices, including iButton® devices, contain an 8-byte unique registration number in read-only memory (ROM). This registration number is used as a unique network address on a 1-Wire bus.
Videx Inc.'s iButtons are dime-sized metal canisters containing a unique ID number that cannot be duplicated. When the iBR9000 touches an iButton, the button's ID is stored in its memory, along with ...