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A2M Installation: Adding 2 Door Expansion Board To Access Control Panel

2 door panels can be expanded to 4 doors by adding an optional 2 door expansion module. The module plugs into the main board and provides additional 2 Doors - inputs and outputs.


Step 1:

  1. Login to the controller and manually backup user data and log data.
  2. Disconnect the backup battery from the power module.
  3. Disconnect main power from the system by removing the power cord.
  4. The expansion module mounts under the 2-door controller and the 2-door controller will have to temporarily be removed. Note the location of all the plugin connectors and carefully unplug them and unplug the network cable.
  5. Remove the 4 screws securing the controller to the mounting posts and carefully remove the 2-door controller. The screws will be used to reinstall the controller.


  6. Remove the longer standoffs. These will be used to reinstall the controller.
  7. Align the 2-door ACM over the short standoffs attached to the enclosure, with the reader connectors towards the top of the enclosure.
  8. Use the longer standoffs, removed in step 6, to secure the expansion module to the short standoffs. Do not overtighten or the expansion module could be damaged.
  9. Plug the ribbon cable from the expansion module into the 26-pin connector on the back of the 2-door controller. Make sure the connector is properly positioned and aligned. An improper connection will damage the expansion module and the controller.


    1. Align the 2-door controller over the longer standoffs and use the removed screws in step 5 to secure the controller. Do not overtighten or the controller could be damaged.
    2. Reconnect the plugin connectors and the network cable and make the connections to the expansion module before reapplying power or connecting the backup battery.


    Step 2: Apply New Licensing

    1. Power on Controller.
    2. Go to the license page.
    3. You will see "Add expansion key" button
    4. Click "Add expansion key" button
    5. System will be rebooted automatically.



    Initial submission Date: January 14, 2025

    Article authored by: Curtis Armstrong, Tier 2