RS-232 Control 'CR': Carriage Return (0x0D), all required AT Command issued a final plus add Carriage Return Control command structure xxaabbccddeeffgghhiijj'CR' aa:PA Control Status bb:Power Control Status cc:Mute Control Status dd:DT Control Status ee:Volume Control Status ff:Treble Control Status gg:Bass Control Status hh:Balance Control Status ii:Source Control Status jj:Keypad connection status (00: Not connected 01: Connected) Ask Status command structure (2) ?xxPP'CR' xx: Indicates that the control object code 10 :Master's All Zone 20 :Salve 1's All Zone 30 :Salve 2's All Zone 11 :Master's Zone1 12 :Master's Zone2 13 :Master's Zone3 21 :Salve 1's Zone1 22 :Salve 1's Zone2 23 :Salve 1's Zone3 ............... PP:Indicates that the control action code PA:PA control PR:Power control MU:Mute control DT:DT control VO:Volume control TR:Treble control BS:Bass control BL:Balance control CH:Source control LS:Keypad connection status (00: Not connected 01: Connected) Reply command: >xxPPuu'CR' Ex : Ask Master Zone 3 Volume status ?13VO /Reply >13VO21 ( Master Zone 3 Volume Level 23 ) Modify the Source Name : Enter 1<********'CR'make change Source 1 Display Name;***(Shall be valid ASCII code 8) Enter 2<********'CR'make change Source 2 Display Name Enter 3<********'CR'make change Source 3 Display Name Enter 4<********'CR'make change Source 4 Display Name Enter 5<********'CR'make change Source 5 Display Name Enter 6<********'CR'make change Source 6 Display Name Ex : Change Source 3 will be Radio 3