15 Nov How to Add an External Siren to a Honeywell Lynx Quick Connect Panel
If you’re like the many people that want to add an external siren to your Honeywell Lynx, you’ve come to the right place. This information has taken a little time to compile and test and it should serve you well to have it all in one place with multiple options.
There are three scenarios that you will find yourself in.
- I want another siren inside the house or business
- I want another siren outside my house or business
- Or I want a seriously loud siren and possibly a strobe also outside my house or business.
If you didn’t already know, the Lynx and the Simon XT don’t have much power output in their external siren screw terminals. 6-14VDC, 120mA max is what the Lynx Plus has. This means you either need a siren that only needs less than 120mA, or you need to add a relay to that terminal and then connect it to more power to push a bigger siren.
I want another siren inside the house or business
The first scenario is you want another siren indoors. There are two ways to do this. You can buy the wireless siren made by Honeywell, or you can buy a hardwired siren that can run with a low amp input.
I want another siren outside my home or business
The second scenario is the same as the first except we put the siren outside. It will not be super loud, but usually loud enough.
I want a loud siren and/or a strobe combo outside
The third scenario is where you want a very loud siren or a siren/strobe combo, and 
the Lynx does not supply enough power. In this case, you need to add an external relay that’s wired to a power supply in an enclosure. You’ll then need to wire the siren/strobe outdoors to the power supply. The power supply will have its own transformer and back-up battery as well.
There are two ways to do this: one where you can’t get a wire from the Lynx panel to the relay and one where you can. If you can’t get a wire from the panel to the relay, then you will need a wireless relay (The box on the bottom right of the picture below.
If you can get a wire from the Lynx Panel to the relay, then you will follow the diagram below. The parts you will need to purchase to make this work are the following:
- Power Supply to handle enough mA – If we want to use the Outdoor Siren/Strobe we will need 560mA. This power supply has 1.2Amps and should be plenty.
- Enclosure – You need to put all this extra stuff inside something don’t you? The enclosure is an extra box to put it all in.
- Transformer – To plug your power supply into the wall
- Wire
- Back Up Battery – If you want it to work when the power is out
- Sensitive Relay
The Sensitive Relay is required because the Lynx has a current limit of 3mA. A jumper wire is required from TRG+ to the POS+ terminal as well as common ground.
You then program the trigger to start on system operation-any burglar alarm and stop on system operation-bell timeout.
Good luck, and please let us know how it works out!
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