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PC to CPU:

'STX' 'ADR' 'S' 'CHK' 'ETX'

'S'
ASCII-Code 0x53 OR 0x80 = 0xD3
Example:
ADR = 1
String =
0x02 0x81 0xD3 0xD2 0x03 (5 Bytes)
CPU to PC

'STX' 'ADR' 'S' Info1 Info2 ..... Info9 'CHK' 'ETX' (read value)

'S'
ASCII-Code 0x53 OR 0x80 = 0xD3
Info1 to
'0' = "AUS"; '1' = "NO"
Info9
per 1 byte in ASCII OR 0x80 (0xB0 oder 0xB1)
Info1 = start/stopp
Info2 = collective failure
Info3 = indicator/softkeys
Info4 = indicator/softkeys
Info5 = indicator/softkeys
Info6 = indicator/softkeys
Info7 = indicator/softkeys
Info8 = indicator/softkeys
Info9 = error number
Example:
ADR = 1, Info1 = 1, Info2 = 0, Info3 = 1, Info4 = 1, Info5 = 0, Info6 = 0, Info7 = 0, Info8 = 0, Info9 = 0
String =
0x02 0x81 0xD3 0xB1 0xB0 0xB1 0xB1 0xB0 0xB0 0xB0 0xB0 0xB0 0xE3 0x03 (14 Bytes)