The electronic key is a normal
iButton DS***0A-F5 equiped with a metal ring, and is used
associated with the magnetic probe **-J**3 of Dallas.we 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...
