RRF Configurator & PT100 on Maestro



  • My uSD card died so I thought I'd try the RRF configurator to speed up setup.

    Heater 1 has a PT100 on it and I set up what I thought was the correct setup. RRFC spit out this line:

    M305 P1 X200 R2200

    It should have been:

    M305 P1 X200

    RRF seemed to get confused with the 'R2200' parameter. Once I removed 'R2200', the sensor worked fine.

    For the moment everything else seems fine.



  • The 'R2200' parameter is required for a Maestro.
    If it was another board like the Duet2 i think is R4700.

    This is my Hotend heater line for a E3D V6
    M305 P1 T100000 B4725 C7.060000e-8 R2200

    And my Bed is
    M305 P0 T98801 B4185 R2200

    Looks like you are missing some parameters, possibly


  • administrators

    @jrdm said in RRF Configurator & PT100 on Maestro:

    My uSD card died so I thought I'd try the RRF configurator to speed up setup.

    Heater 1 has a PT100 on it and I set up what I thought was the correct setup. RRFC spit out this line:

    M305 P1 X200 R2200

    It should have been:

    M305 P1 X200

    RRFC seemed to get confused with the 'R2200' parameter. Once I removed 'R2200', the sensor worked fine.

    For the moment everything else seems fine.

    Thanks for pointing this out, we'll get it fixed.


  • administrators

    @paulhew said in RRF Configurator & PT100 on Maestro:

    The 'R2200' parameter is required for a Maestro.
    If it was another board like the Duet2 i think is R4700.

    Actually the R parameter is almost never needed. The cases when it is needed are:

    • When using a Duet 085 or a later Duet 06 with a thermistor, because the default for these boards is 1000 but later boards use a 4700 ohm series resistor;
    • When using a PT100 with a third-party MAX31865 interface board, and the reference resistor on that board is not 400 ohms.


  • @dc42 Learnt something again today!


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