Installation manual

Installation manual for the CD3403 Page 15
C
ONNECTION OF A KEY SWITCH
To “key” zone
Key switch
C
NO
NC
C
NC
Tamper
+12V
To “Arm/Diarm”
output
To “System Clear”
output
4k7
4k7
Programme outputs for negative applied (-)
1K
1K
Figure 11.
Connection of a key switch with LED's
C
ONNECTION OF A RELAY OR AN
LED
Output
+12 Volt
NC NO
C
+12 Volt
R = 820
Ω
Output
Figure 12.
Connection of a relay or an LED on the output
The resistor R is necessary to adjust the current. For most LED’s a current of approximately 15 mA is
sufficient. The resistance calculation is as follows:
R
I
V
==
−
=
−
=
13.8V
15 mA
13.8V 2V
15mA
led
V
787
Ω
When rounded off this is 820 Ohms.