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D o o r p h o n e
B ell b utto n
Sp eaker
M ic ro p ho ne
Sig nal
lam p
D o o r o p en er
Fig. 29: Interfacing of a simple door phone
2.5.3
Interfacing of a door intercom module
Figure 31 illustrates the connection of an existing door intercom module with
a door phone, door intercom amplifier and power supply to the TFE module.
Ask your dealer about this. Ensure that the doorbell is connected potential-free,
or connect it as shown in Figure 32. When the doorbell is pressed, the call is
signaled at all of the terminals entered in the TFE call mode. If you have an
answering machine entered there, for example, a party at the door will be able
to hear the answering machine message.
TFE m o d ule
LED
Aud io and
Door op ener
sp reec h p aths
40
B ell tran sfo rm er
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