11-27-2020, 07:12 AM
Bill this may help to understand how the " handshaking " works with the k-line pin on the obd connector;
https://www.obdclearinghouse.com/Files/v...ileID=1380
In brief; the k-line pin sits at +12volts and is not active ( no signal is present, just 12 volts )
The interface/computer sends a "wake-up message" by pulling the 12 v to ground in one of 3 ways.
When the e.c.u. receives this message it starts to "negotiate" a data speed setting and after that it responds with requested info/blurts out data for the interface.
The interface box translates the 12 volt level into a 5 volt level by-directional so the two can converse and understand with each other's language.
My guess is that this "wakeup message" has changed with new models ( the computer generates this message in the software program ) but the protocol of the k-line data should be the same since it is industry wide , i don't know.
All this will not solve your "not supported" message but may help to understand how things work, thanks for your very interesting updates.
https://www.obdclearinghouse.com/Files/v...ileID=1380
In brief; the k-line pin sits at +12volts and is not active ( no signal is present, just 12 volts )
The interface/computer sends a "wake-up message" by pulling the 12 v to ground in one of 3 ways.
When the e.c.u. receives this message it starts to "negotiate" a data speed setting and after that it responds with requested info/blurts out data for the interface.
The interface box translates the 12 volt level into a 5 volt level by-directional so the two can converse and understand with each other's language.
My guess is that this "wakeup message" has changed with new models ( the computer generates this message in the software program ) but the protocol of the k-line data should be the same since it is industry wide , i don't know.
All this will not solve your "not supported" message but may help to understand how things work, thanks for your very interesting updates.