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PC to CPU:

'STX' 'ADR' 'l' level 'CHK' 'ETX'

'I'
ASCII-Code 0x6C OR 0x80 = 0xEC
level

'0': unlock keyboard
'1': lock keyboard level 1
'2': lock keyboard level 2

Example:
ADR = 1; Lock keyboard level 2:
String =
0x02 0x81 0xEC 0xB2 0xDF 0x03 (6 Bytes)
CPU to PC

'STX' 'ADR' 'l' level 'CHK' 'ETX'

'I'
ASCII-Code 0x6C OR 0x80 = 0xEC