Adding a cellular module to a Honeywell LYNX L5100 controller currently is not as simple as it once was. Since you are reading this article, we will assume that you have run into one of these systems, and have likely already reviewed the datasheet that lists the Honeywell GSMVLP5-4G Cellular Communicator as the compatible part, unfortunately that component has been discontinued.

With that component being discontinued, you are left with only one option to provide alarm monitoring for the Lynx L5100 security system, which is through the Honeywell L5100-WIFI IP Communicator. Please note that alarm monitoring over WiFi will not be as reliable as using cellular communication. We recommend setting up at least 2 alarm monitoring communication pathways when available.

On the off chance you can obtain a second-hand GSMVLP5-4G module, you will still be able to activate it and use it with the system.

We would recommend either utilizing the Honeywell L5100-WIFI IP Communicator or replacing the LYNX L5100 controller with a newer model.