Tx 

• if filament loaded unloads current filament
• selects and loads filament x
• once done confirmed by "ok\n"
  
  

Lx

• loads filament x into the unit
• if successful or canceled by user on the unit returns "ok\n"

Ux

• unloads filament if loaded
• once done confirmed by "ok\n"

Gcode implemetation : M702 C sends U0 to the unit, waits for "ok\n" from the unit.

Sx

• if x = 0 returns "ok\n"
• if x = 1 returns MMU2 firmware version ( not implemented )

Fxy

• sets filement type y to the extruder x ( not implemented )
  

Xx

• mmu reset ( not implemented )
• currently just X0