31Serial Commands- (Status Response code):The HD4xSTPMX provides the status of the matrix via RS-232via feedback.Feedback Status Response code:byte 1 --> STX 1111111111110N1NN ETX <-- byte 19Description Response CodeByte 1 STX Start of Text ( header)Byte 2 OUTPUT A connected to = In1,2,3 or 4Byte 3 OUTPUT B connected to = In1,2,3 or 4Byte 4 OUTPUT C connected to = In1,2,3 or 4Byte 5 OUTPUT D connected to = In1,2,3 or 4Byte 6 OUTPUT E connected to = In1,2,3 or 4Byte 7 OUTPUT F connected to = In1,2,3 or 4Byte 8 OUTPUT G connected to = In1,2,3 or 4Byte 9 OUTPUT H connected to = In1,2,3 or 41,2,3, or 4 ( input selected)Byte 10 HDMI Input 1 is connected and detected.Byte 11 HDMI Input 2 is connected and detected.Byte 12 HDMI Input 3 is connected and detected.Byte 13 HDMI Input 4 is connected and detected.0 = input NOT detected,1 = input detected,N = not applicableByte 14 LCD backlight on or off 0= LCD backlight OFF1= LCD backlight ON,N = not applicableByte 15 Scan on or off N = not applicableByte 16 Matrix power status:Standby, Power Off or ON0= Standby1= ONX = Power OFFByte 17 States Optical Output source N=NAByte 18 Aux Audio Input selection N=NAByte 19 ETX End of Text ( header)