AT&T Security Systems Frequently Asked Questions

How do I set up GeoFence arming reminders on an iOS device in TC2.0?
GeoFence arming reminders alert when an associated device leaves the designated area, and the system is not armed. Learn to create a GeoFence arming reminder.
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How Do I Register the Sim Card in a Lyric Gateway Cellular Communicator?
The sim card in a Lyric Gateway Cellular Communicator can only be registered by a Honeywell dealer. Learn how to register the cellular communicator's sim.
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What is the CRC Code For?
The CRC, or cyclical redundancy check, is in place to keep programmers from making typographical errors when activating a communicator. Learn more here!
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Can I Change the Rev Chip on a Vista 21iP?
Honeywell sells a PROM Chip for older versions of the VISTA 21iP that allows these systems to be used with Total Connect 2.0. Learn how to change the VISTA 21iP Rev Chip.
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How Do I Enable the GSMVLP4G on my Honeywell L3000?
Once the GSMVLP4G has been physically installed, you must enable it in programming. Learn how to enable cellular alarm communication on the LynxPlus.
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