RS232 Protocol

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Section 2: Feedback String Format
Standard Response String Format
Start Count ID Type Data Checksum
0xFE 0x17 0xC8 0x20 Char1 … Char13 Flag1 … Flag 8 0xXX
The feedback string is a representation of the display of the unit.
The Char1 - Char13 data bytes contain ASCII data representing the text that appears
across the front display. It can contain source input, volume, and surround mode data
and should be parsed to obtain this information.
The Flag1 - Flag8 data bytes contain data on which of the various icons on the front
display are currently illuminated.
The display status uses 2 bits in Flag6 to confirm if the front display is On or Off.
Note: The Zone 2/3/4 bits were added with Main software V1.2.0. These bits will toggle
when their respective Zone is active so zone power status can be tracked.
Flag1 - Flag4 Data
Flag1 Flag2 Flag3 Flag4
Bit0 char1_dot char8_dot TAPEM Tuned
Bit1 char2_dot char9_dot MULTI St (Tuner)
Bit2 char3_dot char10_dot 4 PTY
Bit3 char4_dot char11_dot 3 TA
Bit4 char5_dot char12_dot 2 TP
Bit5 char6_dot char13_dot 1 RT
Bit6 char7_dot char8_colon Coaxial RDS
Bit7 Zone 2 Zone 3 Optical RBDS
Flag5 - Flag8 Data
Flag5 Flag6 Flag7 Flag8
Bit0 Zone Display Mode 1 SBR CB
Bit1 Dynamic Range Display Mode 0 SBL S
Bit2 DSP Zone 4 EX LFE
Bit3 HDCD Standby LED Sur SR
Bit4 Dolby 3 Stereo OSD THX SL
Bit5 Dolby PLII Auto dts ES FR
Bit6 Dolby Pro Logic Memory dts C
Bit7 Dolby Digital Preset MPEG FL
Display Status
Display On Display Off
Display Mode 1 0 1
Display Mode 0 0 0