The electronic key is a normal iButton DS1990A-F5 equiped

with a metal ring, and is used associated with the magnetic

probe 94-J-03 of Dallas. Liteway have a similar one PB-L4, which has same functions. The key is held magnetically to the probe and transmits the data by an electrical interface. Please refer for all electric data and the details of the electrical interface (protocol timing and voltage) to the data-book by Dallas-Semiconductors…

The electronic key associated with the magnetic probe is mainly used in electronic controled beverage-systems, electronic cashier-terminals, key-lock-systems and personal-computers. With now seven different colors for the plastic body the user can define different hierarchical systems.