July 2007 Tech Talk Online Q & A

Q:  How can a new alarm panel be made to work with an old end-of-line (EOL) configuration that is in a door that I cannot change out?

A:  The trick is to use a relay that is sensitive enough to work with the current limited by the old EOL resistor. Trying using the ELK-924. Place the alarm loop in line with the coil of the relay and panel aux power. The normally closed alarm loop will keep the relay activated and then use the NO contacts to make for a NC alarm loop.

Q:  I need to send an alarm signal between two buildings and have no wires available.  I know I could set up a wireless link, but due to RFI concerns are there any other suggestions?

A:  Actually, you could use a photoelectric beam to transmit the alarm condition. You need to configure the beam transmitter to stop transmitting on an alarm output and this will be detected by the receiving photoelectric unit. I am not sure what wireless devices you are looking at, but you may want to try a more robust wireless system such as from Inovonics.    



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