NEC MultiSync C431, User Manual

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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
Bit 5-2 Reserved (Don't care)
Bit 1 1:Positive Horizontal sync polarity
0:Negative Horizontal sync polarity.
Bit 0 1:Positive Vertical sync polarity.
0:Negative Vertical sync polarity.

H Freq: Horizontal Frequency in unit 0.01kHz

V Freq: Vertical Frequency in unit 0.01Hz
Ex.) When H Freq is '1''2''A''9' (31h, 32h, 41h, 39h), it means 47.77kHz.
STX
Command code
ETX
'0' '7'
STX Command SS H Freq. V Freq. ETX
'4' 'E' Hi Lo MSB LSB MSB LSB