We have made a discovery regarding the compatibility for the Honeywell L5100-WIFI for LYNX Touch Systems. It turns out that L5100-WIFI units with the updated MAC prefix of B82CA0 can be used with Honeywell L5100 Systems running a firmware version of at least 5.00838, but less than 5.05000.
If you aren't familiar with the Honeywell L5100-WIFI, it is an internet communicator that allows a compatible Honeywell LYNX Touch Panel to communicate with the Resideo AlarmNet Servers across an IP (internet protocol) network. The L5100-WIFI accesses the internet by connecting with a local WIFI network. Many users rely on the L5100-WIFI for inexpensive IP monitoring service. The communicator can also be used to set up the LYNX Touch System with Total Connect 2.0, provided that the user's alarm monitoring plan includes access to the platform.
If you recall back in the summer of 2018, it was announced that new Honeywell L5100-WIFI units had an updated MAC prefix, as it was changed from 00D02D to B82CA0. This had several implications. Starting with LYNX Touch Firmware 5.05000, Resideo locked the required MAC prefix so that only L5100-WIFI units with 00D02D were supported. This was later revised in Firmware Version 8.00183 to support the new MAC prefix of B82CA0. As a result, LYNX Touch Systems with a Firmware Version of at least 5.05000, but less than 8.00183, cannot support newer L5100-WIFI units with the MAC prefix of B82CA0. For LYNX Touch firmware in Canada, the required MAC prefix of 00D02D became locked with Firmware Version 5.15000.
However, we didn't realize that LYNX Touch Systems running firmware versions below 5.05000 (and below 5.15000 for Canadian models) do not have the locked MAC prefix requirement. This means that if you have a Honeywell LYNX Touch System with a firmware version of less than 5.05000, then you can use it with a newer L5100-WIFI unit with a MAC prefix of B82CA0. It still must meet the minimum firmware requirement to support the L5100-WIFI (Firmware Version 5.00838), but this allows for some new monitoring possibilities. Most notably, it allows certain Honeywell L5100 units use either the new L5100-WIFI model with the updated MAC prefix or the old model with the old MAC prefix.
In spring of 2019, it was announced that Resideo was no longer allowing Honeywell LYNX Touch Panels to receive over-the-air (OTA) firmware updates. Instead, firmware updates could only be applied locally using the Honeywell LYNXTOUCH-MSD Firmware Updater Tool. Initially, the updater tool was only compatible with the Honeywell L5210 and Honeywell L7000, but it was later made compatible with the Honeywell L5200 as well. But the updater tool was never made compatible with the Honeywell L5100. This makes it impossible to update the firmware for a Honeywell L5100 Security System, and there is no way to get the system onto Firmware Version 8.00123 or higher.
But since Resideo didn't begin locking the required MAC prefix to 00D02D until 5.05000, an L5100 running a firmware version of at least 5.00838, but less than 5.05000, can support all L5100-WIFI units, regardless of their MAC prefix. Therefore, if you have an old Honeywell L5100 System lying around that you were thinking could never be monitored again unless you found a used L5100-WIFI with the old MAC prefix, it may be a good idea to check its firmware to see if it falls in that range.
If you want to check the firmware for a Honeywell L5100, you can do so by choosing Security > More > Tools > enter your Master Code (default 1234) > Test. The firmware revision will be displayed at the top of the screen. This process is the same for any LYNX Touch System, so you can also use this method to check your L5200, L5210, or L7000 firmware. Below is a picture of a Honeywell L7000 on Firmware Version 9.00209..
If you find that your L5100 is running a firmware version of 5.05000 or higher (5.15000 or higher in Canada), then you will be limited to using the older L5100-WIFI with the MAC prefix of 00D02D. With any luck, you may be able to find a used model somewhere with the older prefix. But should your L5100 be running a lower firmware, then the system will be able to support any L5100-WIFI model, including the new ones that you can purchase from Alarm Grid. This is an excellent way to get an old L5100 System set up with low-cost IP monitoring.
Of course, if you have an L5200, L5210, or L7000, then it is recommended that you get the Honeywell LYNXTOUCH-MSD Firmware Updater Tool to upgrade the system firmware to the latest version. The latest firmware is 9.0213 at the time of this writing. Updating to the latest firmware version is always recommended. And as long as the firmware version is 8.00183 or higher, the system can support all versions of the L5100-WIFI, regardless of the MAC prefix.
If you have any questions about the L5100-WIFI or the Honeywell LYNX Touch Systems, then please reach out to us! We are best contacted via email at firstname.lastname@example.org. Our hours for checking email run from 9am to 8pm ET M-F. This is also a great email to reach us if you are interested in starting new monitoring service. We look forward to hearing from you!