PC to CPU:
'STX' 'ADR' 'F' 'CHK' 'ETX'
'F'
ASCII-Code 0x46 OR 0x80 = 0xC6
Example:
ADR = 1
String =
0x02 0x81 0xC6 0xC7 0x03 (5 Bytes)
CPU to PC
'STX' 'ADR' 'F' text 'CHK' 'ETX'
'F'
ASCII-Code 0x46 OR 0x80 = 0xC6
text
text for the error memorized in the control unit. Length always 32 ASCII characters.
The total length of the data record always is 37 characters. The formation of the check sum occurs in the same way than for the other data records.