You need help to understand the data transmission scheme and exactly how to connect the UBT module.
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Because I understand it this way:
- if there is a KTA module (T11)
pin 2 (A12) ----- pin 19 (T11) yellow
pin 11 (A12) ---- pin 9 (T11) white
- if there is no KTA module
pin 2 (A12) ---- J203 rail yellow
pin 11 (A12) ---- J202 rail white
Thank you in advance for all your comments.