2N Door intercom 2N Helios - Manual, 1322 v3.0 - Manual (Page 35)

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Basic unit Extender unit Removed upper part of
(open) (bottom part) extender module
Fig.: 16–Button Extender Module Connection to Basic Unit
Caution
 Extension modules must be interconnected by mounting jumper (tunnel),
delivered together with each extension unit. This part is made from
conductive plastic. If it is necessary to place extender unit at some
distance, or if you lost the jumper, you must interconnect metallic covers
by another way.
Maximum Count of Extenders
9135181E (1×8 buttons) 6 5 4 3 2 1 0
9135182E (2×8 buttons) 0 0 1 1 2 2 3
The table above shows how to combine modules with single (whole) and double
buttons.
Connector for next extender module
connection