This command is used to reconfigure the board it is executed on as a CAN-connected expansion board. It would typically be the only command in the config.g file. When it is executed, the board changes its CAN address to the one specified in the A parameter, stops sending CAN time sync messages, and responds to requests received via CAN just like a regular expansion board. A few GCode commands can still be executed locally for diagnostic purposes, for example M111 and M122