M307 works...
M307 H1 B1 I1 ......
As an example creates a 'heater' that will turn ON if the target temp is below the current sensor temp. The other inverting modes are depreciated as of RRF3 it seems (but are not needed anyway). With your setup I don't think you want to invert any pins only the logic.
@dc42 said in Configure a heater to cool instead:
@theruttmeister said in Configure a heater to cool instead:
It will need to be a separate heater, RRF doesn't support an 'extruder' having multiple heaters
Yes it does, and has done for more than 6 years. See the M563 command.
Ah so I see.
I did the silly thing of looking at M104... which doesn't support syntax for setting multiple temps for a tool.