Denon DRA-F109 control protocol

One of readers, Philipp Smutny, provided data dump from DNP-F109 network player. It was done by plugging Raspberry Pi in out connector of Network Player, where originally you would connect CD player. It looks like that protocol is quite similar to binary protocol described in earlier post and the only difference is 0x01 instead 0x00 after payload length – possibly it marks this as command.

For instance, 00 ff 55 01 01 00 40 00 05 9b means Set volume to 05, while 00 ff 55 01 01 00 41 00 01 98 means Mute On and 00 ff 55 01 01 00 41 00 00 97 is Mute Off. There’re few more commands present in the dump provided by Philipp in gist embeded below.

Unfortuanetly, retransmitting this data doesn’t work with my setup. I get back data I send through DRA-F109 loopback circuit, but amp doesn’t react. I suppose that this may be due to the fact that I’m using 3.3V (5V tolerant) serial USB adapter, however I can’t verify this hypothesis now.