I have Kenwood kpc-7060R head unit in my car and have a dream to connect my laptop to it.
I was very happy when I found info about pinout and protocol on this site
http://www.mictronics.de/?page=cdc_proto
I ‘m using 16F876 as converter to rs232 , spi port to HU and uart to PC.
So far so good ....., but my HU is an old type with a different protocol and with no CDC to monitor the serial bus, I’m stuck.
Does anyone have info about the older protocol, log of the serial transfer between CDC and HU, or any thing that can help with this project?
ken