@oliof no, it’s that there is no standard for describing how to connect the coils. We followed Trinamics naming for Duet 2 WiFi/ Ethernet, but even they changed it, which is why we ended up with (from the link I posted):
Each stepper motor connector has four pins. On Duet 2 WiFi/Ethernet these are labelled '2B 2A 1A 1B' on the back of the board, and on the wiring diagram. The '1' and '2' refer to the coil or phase, the 'A' and 'B' refer to the positive and negative.
On Duet 2 Maestro and Duet 3, the four motor connector pins are labelled 'B1 B2 A1 A2' on the back of the board and on the wiring diagram. The 'A' and 'B' refer to the coil or phase, the '1' and '2' refer to the positive and negative. This is the naming convention used by most stepper motor manufacturers.
Ian