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Unable to read tmc uart 'stepper_x' register IFCNT


Printer Model
Fysetc Voron 2.4 kit
Extruder Type
Clockwork 2
Cooling Type
I read through this thread and it did not seem to help: https://forum.vorondesign.com/threads/unable-to-read-tmc-uart-stepper_x-register-ifcnt.496/ I also got lost once it got too technical with the info about different versions of Katapult. It seems he got around the problem by swapping the can adapter with a can hat.

I am working my way through the initial startup guide for a Voron 2.4 for a Fysetc kit with a Spider 2.2 board, 2209 drivers. I have set it up with BTT Canbus and sensorless homing. I have triple checked all my jumpers.
I got to the "STEPPER_BUZZ STEPPER=stepper_x" step and got the error in the title. I got this error for stepper_x and stepper_y, but none of the stepper_z checks. I swapped the x stepper with one of the z steppers and got the same results.

Oh - and here's an odd side effect: whenever I buzz x or y, the part cooling fan turns on.

I'm really stuck and would appreciate some input.


  • klippy (3).log
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  • config-20240114-052753.zip
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I had a problem that was similar to this in my Fysetc build. Only for the X and Y steppers - I know you say you checked all your jumpers, but did you insert the 24 volt jumper in the corner of the Spider board?
Thanks. I got this same answer on discord because it was quiet here for a while.

My problem now is that I cannot find that connect in my boxes of parts and I cannot find the name/designation of that connector.