Do I need EOL Resistors?
#1
Do I need EOL Resistors?
I am updating my old, real old system. Every door and window has a pair of wires coming back to the panel. I did not have any of the EOL resistors in that setup. Now, it appears that each loop needs an EOL. I was planning on putting two or three of the switches in series to form a loop. Do I need to add an EOL? Where does it go?
Thanks
Mark
Thanks
Mark
#2
Forum Topic Moderator
Some systems can turn off the requirement for the supervision resistors, but most require them. Since you are doing this as a retrofit, you can simply put them right at the terminals at the panel PC board.
#3
Thanks again for your help and support.
I will put them in at the panel. Just what is the purpose of these resistors when installed at the end of the loop?
I will put them in at the panel. Just what is the purpose of these resistors when installed at the end of the loop?
#4
Forum Topic Moderator
When installed at the end of a security loop, they allow you to mix normally open and normally closed contacts on the same loop. Basically, it's a means to monitor the integrity of the circuit.
For things like smoke detectors, they have to be at the last device for the supervision to be meaningful.
For things like smoke detectors, they have to be at the last device for the supervision to be meaningful.
#7
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Location: USA
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Originally Posted by PMS
So, is it best to put the resistor at the contact, across the two terminals? And what if it is a wireless transmitter monitoring contacts, such as a garage door with a 5817?
with normally closed contacts you put the eolr in series with the contact terminal --->eolr--->contact---> common.
as far as wireless those contact do not use eolr supervision.