NEC RS-232C - Manual (Page 10)

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ASCII '0''0' (30h, 30h): Set parameter
ASCII '0''1' (30h, 31h): Momentary
Like Auto Setup function, that automatically changes the parameter.
10 th -13 th bytes) Max. value: Maximum value that monitor can accept. (16bits)
Reply data from the monitor is encoded to ASCII characters.
Ex.) '0''1''2''3' means 0123h (291)
14 th -17 th bytes) Requested setting Value: Echoes back the parameter for confirmation. (16bits)
Reply data from the monitor is encoded to ASCII characters.
Ex.) '0''1''2''3' means 0123h (291)
18 th byte) ETX: End of Message
ASCII ETX (03h)
5.5 Commands
"Command message format" depends on each command . Some commands are shown with usage. Refer to
section 7 to 13.
5.5.1 Save Current Settings.
The controller requests for the monitor to store the adjusted value.

Send "OC"(30h, 43h) as Save current settings command.

Complete "Save Current setting" command packet as follows;
ASCII: 01h-30h-41h-30h-41h-30h-34h-02h-30h-43h-03h-CHK-0Dh
SOH-'0'-'A'-'0'-'A'-'0'-'4'-STX-'0'-'C'-ETX-CHK- CR
The monitor replies the packet for confirmation as follows;
SOH-'0'-'0'-'A'-'B'-'0'-'6'-STX-'0'-'0'-'0'-'C'-ETX-CHK- CR
5.5.2 Get Timing Report and Timing reply.
The controller requests the monitor to report the displayed image timing.
 Send "07"(30h, 37h) as Get Timing Report command.

Complete "Get Timing Report" command packet as follows;
ASCII: 01h-30h-41h-30h-41h-30h-34h-02h-30h-37h-03h-CHK-0Dh
SOH-'0'-'A'-'0'-'A'-'0'-'4'-STX-'0'-'7'-ETX-CHK- CR
The monitor replies status as the following format;

SS: Timing status byte
Bit 7 = 1: Sync Frequency is out of range.
Bit 6 = 1: Unstable count
Command code
STX
'0' 'C'
ETX
Command code
STX
'0' '7'
ETX
Command SS H Freq. V Freq.
STX
'4' 'E' Hi Lo MSB LSB MSB LSB
ETX