===== Cell Management Unit (CMU) Settings =====

To configure cell monitoring, go to **Battery → Cell Management Unit** in the sidebar.

Here you can select the CMU type used in your system and assign communication buses.

==== CMU Type ====

Select the type of **Cell Management Unit (CMU)** you are using.\\
Available options depend on which CMU types you have unlocked via [[https://grnbms.de|grnbms.de]].

''🔓 Each CMU type must be **individually unlocked** before it can be used.''
==== CAN Bus Assignment ====

Depending on the selected CMU, you can assign one or more CAN buses for communication:

  * **Primary CAN Bus**  – main interface to communicate with the CMUs
  * **Secondary CAN Bus**//(optional)//  – can be used for additional CMU chains
  * **Tertiary CAN Bus**//(optional)//  – for even more flexibility in large setups
''🔓 The **Secondary**  and **Tertiary**  CAN buses require additional unlocks and are only available if purchased.''

''⚠️ Make sure that each CMU chain uses a **separate CAN bus**  with correct termination and baud rate.''