Conrad GKA100 Bedienungsanleitung Seite 76

Two connections for speaker / microphone:
Either the included microphone or the speaker can be connected to the two RJ12 sockets. Both
sockets are assigned in precisely the same manner and switched in parallel.

The PIN assignment corresponds to that of a standard phone handset. Function
cannot be guaranteed for every phone handset.
External LED connection:
Pins 1 and 2 are intended for connection of the external LED. Please use recommended
accessories only (see www.conrad.com)
P+ switching plus recognition:
Connect a switching plus signal to pin 3 and 4. Functionally, however, this input only serves
to directly trigger an alarm because the switching plus refers to an impermissible action in the
„ALARM ENABLE" mode.
The reference potential is GND from the external power supply (16). No voltage above 32 V
must be present here.

To avoid unintended short circuit for wiring, only the „P+" pin (3) is assigned. The
other pin was not connected. Therefore, if no reaction appears when the switching
plus is activated, this pin may have been connected.
Switching inputs IN1 / IN2:
The pins 5 and 6 for „IN1", as well as 7 and 8 for „IN2" serve to recognise various switching
conditions in the vehicle. These lines can be directly connected, e.g. to lamps, door contacts
or other switchable consumers. An integrated rectifier and optocoupler protects the device
from polarity reversal and short circuit.
It must only be ensured that a voltage difference of at least 4 V and no more than 32 V is pending
between the two pins (no matter the polarity) and the respective switching input is recognised
as „HIGH". A voltage of less than 2.5 V is securely interpreted as „LOW". The area between
serves to prevent multiple alarming and can only be assigned to a level under specific
circumstances. For more on this, see the corresponding chapter.
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