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I will post some info that I have. This might get you started. First column is a timestamp and the second is the hex message sent. From this first log I found that the changer address seems to be 80 and the head unit 0F. Messages end with 4F. The head unit seems to echo eveything the changer sends it, including 4F. The changer echos everything it is sent too, except for 4F.
804801 seems to mean 'use 4800 baud'
804802 seems to mean 'use 9600 baud'
ON - 4800
'sent from changer
30:22.743 80 AD
30:22.763 80
30:22.763 48
30:22.773 01
30:22.803 0F
30:22.813 48
30:22.823 01
30:22.823 4F
30:22.843 80 '\
30:22.853 48 02 '- Change baud to 9600
'sent from head unit
30:22.733 80
30:22.743 AD 4F
30:22.763 80
30:22.763 48
30:22.773 01
30:22.773 4F
30:22.813 0F
30:22.823 48 01
30:22.833 4F
30:22.833 80 '\
30:22.843 48 02 ' } change baud to 9600
30:22.853 4F '/
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