NEC RS-232C - Manual (Page 41)

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'C'-'3'-'1'-'D' (43h, 33h, 31h, 44h): Security Lock Control reply command
ST-EN: Lock condition result data
ST: Status
'0'-'0'(30h, 30h): No error
'0'-'1'(30h, 31h): Error
EN: Enable /Disable (Current condition)
'0'-'0'(30h, 30h): Disable
'0'-'1'(30h, 31h): Enable
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5
“Check code” for a BCC calculation.
Delimiter
CR (0Dh): End of packet