Nec MultiSync C501 [94/101] Security enable write
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Nec MultiSync C501 [94/101] Security enable write

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Nec MultiSync C501 [94/101] Security enable write
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22.2 Security Enable Write
This command is used in order to write the setting of Security Enable.
1) The controller requests the monitor to set Security password.
Header Message Check code
Delimiter
SOH-'0'-Monitor ID-
'0'-'A'-'1'-'C'
STX-'C'-'A'-'0'-'C'-'0'-'1'-
ENA-'0'-'0'-PWD1-…-PWD16-ETX
BCC CR
Header
SOH (01h): Start of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID of which you want to change a setting.
Ex.) If Monitor ID is '1', specify 'A'.
'0' (30h): Message sender is the controller.
'A' (41h): Message type is "Command".
'1'-'C'(31h,43h): Message length (28byte)
Message
STX (02h): Start of Message
'C'-'A'-'0'-'C' (43h, 41h, 30h, 43h): Security Password Command
'0'-'1' (30h, 31h): Enable Write
ENA: Enable/Disable
00h (30h, 30h): Disable
01h (30h, 31h): Enable
'0'-'0' (30h, 30h): Reserved
PWD1 – PWD16: Password data
The password data is encoded as the following procedure.
Ex.) In the case of password data "1234"
Step1: Password data is handled as character code.
Example:
"1234" -> 31h 32h 33h 34h (ASCII)
Step2: The hexadecimal value of each original character is encoded as two ASCII
characters representing the hex value.
Example:
31h 32h 33h 34h -> '3'-'1'-'3'-'2'-'3'-'3'-'3'-'4'
Step3: Password data is handled as character code once again.
Example:
'3'-'1'-'3'-'2'-'3'-'3'-'3'-'4' -> 33h 31h 33h 32h 33h 33h 33h 34h
(ASCII)
Step4: The hexadecimal value of each original character is encoded as two ASCII
characters representing the value.
Example:
33h 31h 33h 32h 33h 33h 33h 34h
-> '3'-'3'-'3'-'1'-'3'-'3'-'3'-'2'-'3'-'3'-'3'-'3'-'3'-'3'-'3'-'4'
Result: The following data is assigned to PWD1-PWD16.
33h 33h 33h 31h 33h 33h 33h 32h 33h 33h 33h 33h 33h 33h 33h 34h
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.3 “ Check code” for a BCC calculation.
Delimiter
CR (0Dh): End of packet
2) The monitor replies a written in result.
Header Message Check code
Delimiter
SOH-'0'-'0'-Monitor ID-
'B'-'0'-'A'
STX-'C'-'B'-'0'-'C'-'0'-'1'-ST-ETX BCC CR
Header

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