19
X3 / X4
For connection of comfort keypads.
With the default values are input:
”Active” if the contact resistance is smaller than 2kΩ
”Inactive” if the contact resistance is bigger than 3kΩ.
Input has pull up current of approx. 0.8mA. (min 0.7mA, max 1mA )
Example: comfort keypad connected to input X3
X3 / X4 can also be used as configurable inputs
Input 1
3.1 input 1.1
3.2 input 1.2
3.3 GND 1 / 0V
Input 2
4.1 input 2.1
4.2 input 2.2
4.3 GND 2 / 0V
Fire Alarm System shown with cable monitoring type 1 and type 2:
Cable monitoring Type "1"
Type "1" is used with WSA 501.
This kind of cable monitoring detects only
interruption.
Cable monitoring type "2"
Type "2" is used in conjunction with WSA 306.
This type of cable monitoring is the most secure
because it detects both interruption and short circuit.
Data
3.1 Open
3.2 Close
3.3 GND / 0V
4.1 Open
4.2 Close
4.3 GND / 0V
Input circuit (simplified)
