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ESC K - Set keyboard locking
=> STX ESC K <state> CS1 CS2 ADDR
where state = '0' set keyboard LOCK
= '1' set keyboard UNLOCK
= '2' set keyboard Partial LOCK
<= STX ESC K <Retcode> CS1 CS2 ETX
where Retcode = 00 if successful
= 01 if not successful
=> ACK or NAK
ESC L - Transfer file to MR350MKII
=> STX ESC L <filename> CS1 CS2 ADDR
<= ACK or NAK
.... loop on next two steps to transfer file until done
... => STX ESC 'Y' <data> CS1 CS2 ADDR
<= ACK or NAK
=> STX ESC Z CS1 CS2 ADDR (end of data sending)
<= ACK or NAK
ESC M - Write date and time to MR350MKII
=> STX ESC M <datetime> CS1 CS2 ADDR
where <datetime>
yyyymmddhhmmss in ASCII string
<= STX ESC M <Retcode> CS1 CS2 ETX
=> ACK or NAK
ESC N - Set Buzzer Volume
?? STX ESC ‘N’ <n> CS1 CS2 ADDR
Where <n> = ‘0’ low volume
‘5’ medium volume
‘9’ high volume
? ACK or NAK
ESC O - Set auto-execution program
=> STX ESC O <program name> CS1 CS2 ADDR
<= STX ESC O <Retcode> CS1 CS2 ETX
where Retcode = 00 if successful
= 01 if not successful
=> ACK or NAK