How Do I Find the MAC/CRC on a Honeywell L5210?

You can find the MAC/CRC on a Honeywell L5210 by accessing the Comm Diagnostics Menu of System Programming. This information is needed when your panel is being registered with AlarmNet. Your alarm monitoring company will request this information when you initially activate your service.

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When a monitoring company goes to register a Honeywell Panel with AlarmNet, they will need the MAC and CRC codes. This information concerns the communicator used with the system. The most popular options for the L5210 are to use a WIFI connection with an L5100-WIFI module or a cellular connection with an LTE-L57A or LTE-L57V. You can also use a WIFI card and a cellular communicator together for a dual-path setup. Your monitoring company will need to register any communication path with AlarmNet.

When you go to identify the MAC and the CRC, there are certain things you can look for. The MAC Address is a 12-character code consisting of letters and numbers. It often begins with a certain "MAC prefix" that can be used to help identify the communicator. Meanwhile, the CRC will consist of four digits, all numbers. The CRC is also referred to as the "MAC CRC".

Complete the following steps to find the MAC and CRC on a Honeywell L5210:

1. Open Comm Diagnostics. Start from the main screen of the system. Choose Security > More > Tools > Installer Code (default is 4112) > Program > Comm Diagnostics. You are now in the Communication Diagnostics Menu.

2. Display the codes. Press the down arrow on the right side of the screen once. Then choose the option "Communication ID Numbers". The MAC and MAC CRC should appear on the top of the screen, along with any other relevant information.

3. Note the codes. You should write down the MAC and MAC CRC codes and save the information in a safe location. You may need to access it later.

4. Exit programming. Keep pressing the return arrow in the upper-right corner until you return to the main screen. Choose "Yes" when asked if you want to allow the Installer to re-enter programming.

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