Audio Zone Amplifier 100W Operation Manual© MuxLab Inc. 2016 155.3.2 RS232 Communication Commands1) The RS232 commands are case-sensitive.2) “[“, “]” in the commands are only to help identify parameters and not necessary usedin real operations. Other symbols including “.” “%” are part of the actual commands.3) Information listed in the column “Feedback” are for reference, feedback may varydepending on the operation.Communication protocol: Baud rate: 9600; Data bit: 8; Stop bit: 1; Parity bit: none.Command Description Feedback1A1. Switch to input 1 A: 1 -> 12A1. Switch to input 2 A: 2 -> 13A1. Switch to input 3 A: 3 -> 10A0. Mute Audio Line out Mute Audio0A1. Unmute Audio Line out Unmute Audio600% Inquire present working statusA: 1 -> 1Volume: 30Bass: 0Treble: 0601% Turn up Line volume by 1 Volume of LINE: 51602% Turn down Line volume by 1 Volume of LINE: 51603% Turn up Bass volume by 1 Bass of LINE: 4604% Turn down Bass volume by 1 Bass of LINE: 4605% Turn up Treble volume by 1 Treble of LINE: 4606% Turn down Treble volume by 1 Treble of LINE: 4607% Restore factory defaultFactory DefaultA: 1 -> 1Volume: 45Bass: 5Treble: 5610% Turn up Line volume by 3 Volume of LINE: 54620% Turn down Line volume by 3 Volume of LINE: 5161X% Turn up Line volume by X Volume of LINE: 5462X% Turn down Line volume by X Volume of LINE: 547[x][x]% Preset line volume, [xx] can be 00~60, 61degrees in total.Volume of LINE: 508[x][x]% Preset the bass level, [xx] can be 00~10,11 degrees in total.Bass of LINE: 7