Hi Everyone,
I try to generate a quadrature signal with a MCU STM32 and L297 chip.
I just phase A and C of L297 in order to have the 90° offset.
When i use an arduino to decode my quadrature signal, everything works fine, arudino receives the correct number of pulse.
Now, I try to decode this quadrature signal with a chinese DRO GCS900-2D and... nothing is working.
It's like it doesn't receive signal.
I wire the Dsub9 plug, wired here:

The only difference I have, is I do not have R phase wire. Do you think this is mandatory?
I also verified the Dsub9 wiring/plug byusing it between my arduino and my L297 and this works fine.
any idea ?

Thank you

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