Where Do I Find the CRC on My Honeywell Wireless Alarm System?

You can find the CRC on your Honeywell Wireless Alarm System inside the Communication ID Numbers Menu. In order to access this menu, you will need to provide the Installer Code for your system. This code is set to 4112 by default. This handy menu includes both the MAC and CRC codes.


You must provide the MAC and MAC CRC codes to your alarm monitoring company when you are activating your panel for IP monitoring service. This requires that your panel has an IP communicator installed. If your panel does not have an IP communicator, then it will not have MAC and CRC codes. The Lyric Alarm Panel has a WIFI communicator built-in, so it will always have MAC and CRC codes. But a LYNX Touch Panel will only have MAC and CRC codes if an L5100-WIFI Card has been installed.

Activating the IP communicator for your panel will serve a few purposes. For one, your alarm monitoring company will be able associate the communicator with your AlarmNet account. They will also be able able to associate it with the monitoring station, if you have central station service. And if your monitoring plan includes access to Total Connect 2.0, then your monitoring company will also tie the IP communicator to your TC2 account. This is important for accessing TC2 for things like controlling Z-Wave devices and viewing TC2 Camera. For more information on our monitoring plans, please check our alarm monitoring page.

If you need to find the MAC and CRC codes for your panel, it is actually very easy. You should save this information by writing it down and keeping it in a safe place in case you ever need to access it later. Complete the following steps to find your MAC and CRC codes on a wireless Honeywell Panel:

1. Access Communication ID Numbers. Begin from the main screen of your panel. Select Security > More (LYNX Touch only) > Tools > Installer Code (default is 4112) > Program > Comm Diagnostics > down arrow > Communication ID Numbers. The communication ID numbers will be displayed at the top of the screen.

2. Save the codes. Write down the MAC and MAC CRC codes, and store them in a safe location. This is important in case you ever need to access these codes later. Remember, your alarm monitoring company will need these codes to activate the IP communicator.

3. Exit programming. You can now exit programming and return to the main screen. To do this, repeatedly press the return arrow in the upper-right corner until you are taken back to the home screen. LYNX Touch users must select "Yes" when asked if you want to allow the Installer to re-enter programming.

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