UART setting:9600bps, 8bit, no parity, 1stop bit 0. initialize(buffer clear) command ... 1. Firmware version check .hello reply :TerraBerryDAC II V02Lxx(YYYYMMDD) xx is level YYYYMMDD is Year Month Day 2. Serial port command echo control .echo .noecho 3. Serial port speed change Change port speed 9600bps to 115200bps Also need speed change RaspberryPi serial port after this command. Keep 115200bps till reset or power off. 115200bps .115200 4. DAC response terminate chractor Change DAC messaege terminate chractor CR/LF .crlf (default) CR .cr LF .lf 5. DAC reset Rset DAC MCU and seto intial value to SRC/DAC Notice:Attenetor set 255 after reset. .reset 6. DAC message control DAC messate ON .msgon DAC message OFF (default) .msgoff 7. DAC sound mode setting .sound=[1|2|3] 1=Sound Setting 1 (default) 2=Sound Setting 2 2=Sound Setting 3 *See Table 27. SC1-0 bits Control of AK4490 data sheet 8. DAC filter setting .filter=[0|1|2|3] 0=Sharp Roll-off Filter 1=Slow Roll-off Filter 2=Short delay Sharp Roll-off Filter (default) 3=Short delay Slow Roll-off Filter *See Table 14. Digital Filter Setting of AK4490 data sheet 9. Attenuator setting Increment ATT .att+ Decrement ATT .att- ATT set 0xFFƒg .attf ATT set 0 .att0 ATT set val ex) set 100 to ATT .att=100 10. DoP setting SRC DoP decoder off .dopoff SRC DoP decoder on .dopon DoP decoder auto (default) .dopauto 11. DSD gain setting DSD out block gain -6dB ON(default) .ogainon DSD out block gain -6dB OFF .ogainoff DSD in gain 6dB ON .igainon DSD in gain 6dB OFF (default) .igainoff 12. SRC/DAC mode setting SRC DAC auto (default) .dacauto SRC PCMin/PCMout, DAC PCM mode .dacpcm SRC DSD(DoP ON)in/DSDout, DAC DSD mode .dacdsd SRC PCM(DoP OFF)in/DSDout, DAC DSD mode .dacpcmdsd SRC DSD(DoP ON)in/PCMout, DAC PCM mode .dacdsdpcm 13. DAC DSDD setting When DAC is DSD mode, bypass ATT Bypass ATT .dsddon Enable ATT (default) .dsddoff 14. SRC dither setting SRC dither ON (default) .dither ON SRC dither OFF .dither OFF 15. DAC mute control .mon .moff 16. SRC bypass control This command SRC bypass mode cotrol. SRC enable (default) .bypsoff SRC bypass for PCM48KHz, MCLK=49.152MHz .bypspcm48 SRC bypass for PCM44.1KHz, MCLK=45.1584MHz .bypspcm44 SRC bypass for DSD, MCLK=45.1584MHz .bypsdsd