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Driesk, The length of the cable should not be the problem, as long as you mean the Lin bus cable. I use 10 metres UTP cable for the lin bus. You should however use a short UART TTL cable, and my pl2303 costed not more that € 2,25. Maybe trying some other values for the wait time (a) can help you. Go...

Someone asked for a schematic.
In am cotrolling an AXA RV2900 from my Raspberry Pi.
I use a pl2300 USB to UART TTL module to interface with the lin-bus driver.
This is the schematic of a working setup.
It works well with the Python script of kabelmanroel.