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Startup sequence
================
When initialized, MMU sends
- MMU => 'start\n'
We follow with
- MMU <= 'S1\n'
- MMU => 'ok*Firmware version*\n'
- MMU <= 'S2\n'
- MMU => 'ok*Build number*\n'
#if (12V_mode)
- MMU <= 'M1\n'
- MMU => 'ok\n'
#endif
- MMU <= 'P0\n'
- MMU => '*FINDA status*\n'
Now we are sure MMU is available and ready. If there was a timeout or other communication problem somewhere, printer will be killed.
- *Firmware version* is an integer value, but we don't care about it
- *Build number* is an integer value and has to be >=126, or =>132 if 12V mode is enabled
- *FINDA status* is 1 if the filament is loaded to the extruder, 0 otherwise
*Build number* is checked against the required value, if it does not match, printer is halted.
Toolchange
==========
- MMU <= 'T*Filament index*\n'
MMU sends
- MMU => 'ok\n'
as soon as the filament is fed down to the extruder. We follow with
- MMU <= 'C0\n'
MMU will feed a few more millimeters of filament for the extruder gears to grab.
When done, the MMU sends
- MMU => 'ok\n'
We don't wait for a response here but immediately continue with the next gcode which should
be one or more extruder moves to feed the filament into the hotend.
FINDA status
============
- MMU <= 'P0\n'
- MMU => '*FINDA status*\n'
*FINDA status* is 1 if the is filament loaded to the extruder, 0 otherwise. This could be used as filament runout sensor if probed regularly.
Load filament
=============
- MMU <= 'L*Filament index*\n'
MMU will feed filament down to the extruder, when done
- MMU => 'ok\n'
Unload filament
=============
- MMU <= 'U0\n'
MMU will retract current filament from the extruder, when done
- MMU => 'ok\n'
Eject filament
==============
- MMU <= 'E*Filament index*\n'
- MMU => 'ok\n'
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