ET8/480, ET8/480S and ET8/480PT - TECHNICAL MANUAL - 31
Mode C
Used for inputting the individual values of a numeric nature (range 0-65535)
Mode D
Used for inputting telephone numbers and code number.
Mode F
Mode used for the self-learning of the PIT proximity keys to be associated with the various users (one key per user).
Mode G
Used for inputting the sectors S1 - S4 associated with a zone managed by individual user.