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The Help command “H” returns a full list of all possible RS-232 commands:
KD-AMP220>H
---------------------------------------------------
-- Key Digital Systems HELP --
---------------------------------------------------
-- KD-AMP220 F/W Version : V1.0.0 --
-- SPO01SA01 : Switch to Audio Input1 --
-- SPO01SA02 : Switch to Audio Input2 --
-- SPI01AE : Mute MIC Audio Input --
-- SPI01AD : Unmute MIC Audio Input --
-- SPI02AE : Mute LINE Audio Input --
-- SPI02AD : Unmute LINE Audio Input --
-- SPO01AE : Mute Audio Output --
-- SPO01AD : Unmute Audio Output --
-- SPO01NGON : Set Noise Gate ON --
-- SPO01NGOFF : Set Noise Gate OFF --
-- --
-- SPI01AVU : Turn Up the Volume of MIC --
-- SPI01AVD : Turn Down the Volume of MIC --
-- SPO01AVU : Turn Up the Volume of LINE --
-- SPO01AVD : Turn Down the Volum of LINE --
-- SPO01ALU : Turn Up the Bass Level of LINE --
-- SPO01ALD : Turn Down the Bass Level of LINE --
-- SPO01AHU : Turn Up the Treble Level of LINE --
-- SPO01AHD : Turn Down the Treble Level of LINE --
-- xx = [00~60], yy = [00~08] --
-- SPI01AVxx : Set the Volume of MIC to xx --
-- SPO01AVxx : Set the Volume of LINE to xx --
-- SPO01ALyy : Set the Bass Level of LINE to yy --
-- SPO01AHyy : Set the Treble Level of LINE to yy--
-- --
-- --
-- SPCDF : Set Factory Default --
-- H : Show Help --
-- STA : Show Status --
---------------------------------------------------
The Status command “STA” returns unit status for all settings
KD-AMP220>sta
---------------------------------------------------
-- Key Digital Systems STATUS --
---------------------------------------------------
-- KD-AMP220 F/W Version : V1.0.0 --
-- Line Audio Source : Input 1 --
-- MIC Audio : Volume = 45, Mute = OFF --
-- Line Audio : Volume = 45, Mute = OFF --
-- Bass = 4, Treble = 4 --
-- Noise Gate : ON --
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