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2011-02 | Installation and User Instructions | 5 | Call Stations
The value of resistor R in figure 18.9 depends on the
voltage of the external source, the forward voltage of the
LED and the current flowing through the LED:
V
-------------------------------------------- -
R
=
For example, the voltage of the external source is 24 V,
the forward voltage of the LED is 2 V and the current
flowing through the LED is 10 mA, then:
24 2
-------------------- -
R
=
⋅
10 10
Warning
Do not connect DC or AC signals to the control
inputs, otherwise the input circuit may be
damaged. Only use voltage-free contacts.
18.2.5 External speaker (X142)
The external interface for external speakers consists of a
pin header connector with 6 positions (see the PCB for
the pin numbering.) When using an external
loudspeaker, also connect a volume control (see section
18.2.2).
table 18.9: X142 connector details
Pin
Signal
1, 2, 3
Speaker +
4, 5, 6
Speaker -
table 18. 1 0: X142 technical data
Impedance:
8 to 32 ohm
Signal/Noise ratio:
typical 80 dB ± 3 dB at max. output
Output power:
typical 100 mW, max. 300 mW
Bosch Security Systems | 2011-02
–
V
source
forward
I
–
2200 Ω
( )
=
3 –
18.2.6 Keypad interface (X143)
The external interface for the keypad (kits) consists of an
IDC connector with 16 positions. Keypads are
connected in series. That means there is only a direct
connection between the call station kit and the first
keypad. The second keypad is connected to the first, the
third to the second etc. using standard flat cables.
table 18. 1 1: X143 connector details
Pin
Signal
1
Synchronization line.
2
GND
3
Interrupt line (INT)
4
GND
5
Data I2C (SDA)
6
GND
7
Clock I2C (SCL)
8
GND
9
Power
10
GND
11
Power
12
GND
13
Power
14
GND
15
Power
16
GND
en | 223
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