Alpha Technologies GSM-VarioBell User Manual page 13

Connection of extending modules VBD10(5)-mod
Buttons extending modules are VBD10-mod with 10
buttons and VBD5-mod with 5 buttons.
Buttons numbering will be explain further but it is done on
each button module by DIP switch (6).
PCB board with components VBDx-mod is connected to
button module by screw terminal only (5) and via 3 wire cable
(4).
Connection between modules is provide by flat cables
K1. (1) is connection to previous module, (2) is connection of
following button module, (3) is connection between button
modules (still the same flat cable K1)
Connector (7) one of the module is used for connection
to basic module VBG-xx (to connector for expanding modules).
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