NEC P403-AVT User Manual download pdf (Page 21)

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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

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NEC P403-AVT User Manual Page 21