Anyone familiar with the communications technology used between Menvier Remote LCD Keypads and their alarm panels? I am interetsed in using an off-the-shelf Keypad for a Homebrew Alarm system and these look like the sort of thing I need. I assume they use some form of serial comms rather than a whole bunch of wires between the units. I'd like to have an idea of the communictaions I need to interface to before I go off and aquire one.
Are the interfaces perhaps standard across Alarm systems or are they unique to each manufacturer? Perhaps they use standard protocols lie RS232 or I2C?
Any clues much Appreciate.
Bert