Depending if the device is normally open or normally closed, will depend on how the end-of-line
resistor is connected. The end-of-line resistor is what the Alarm Panel looks for to determine if there
has been a violation or not. Therefore, it is very important to connect it correctly!
The end of line resistor must be 3K3 ( = ohm).
Resistors are identified by the colour bands, each colour represents a different value and the position of
the band represents a different digit or multiplier, as shown below.
Figure 3: Resistor Colours
Calculating the value:
1. The first band is orange which is 3
2. The second band is also orange which equals 3
3. Put the first two bands together which will be 33
4. The third band is red, which is equal to 100
5. To get the value of the resistor multiply the first two digits, 33, with the third digits value, 100
6. The answer is 3300, which can also be 3.3K or 3K3 (K is placed in place of the dot)
7. The value of the above digram is 3K3 with a tolerance of 5%
Connecting Resistors to a Zone
Normally open devices are wired in parrallel to the end-of-line resistor
Normally closed devices must be wired in series with the end-of-line
resistor
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