2N Lift emergency phone 2N LiftNet - Manual, 1446 v1.8.3 - Manual (Page 53)

Audio Unit
– Lift Shaft / Cabin Roof
2.5
53
Warning
 Avoid the audio unit address duplicity.
Connection
Release the screw on the right-hand side and open the connector cover. There is just
one connector – for bus connection. Remove the terminal board from the connector,
connect the wires and replace the terminal board. The connection polarity is arbitrary.
Warning
 Connection to different, e.g. higher-voltage, cables leads to damage or
destruction of the audio unit.
Caution
 The unit is powered via a 2-wire bus from the central unit. Unplugging of
the bus from the CU causes switching off of the unit.