Installation guide

1.3 Characteristics of the modules
1.3.1 The basic module of electronics Fermax PBX DP
The basic module of Fermax PBX DP panel is supplied in two versions –
with two pushbuttons - Fermax PBX DP-2 (a version for 1 or 2 pushbuttons)
and two pushbuttons with a possibility of expansion by additional 8
pushbuttons, i.e. each basic panel allows connection of up to 10 pushbuttons
with no further accessories of Fermax PBX DP panel. The basic module can be
further expanded by additional 8 pushbuttons via modules called Fermax PBX
DP EXP and a keypad module called Fermax PBX KEY.
Picture 1 Schematics of connection and set-up elements