NEC RS-232C 用户手册

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5.5.2 Get Timing Report and Timing reply.

The controller requests the monitor to report the displayed image timing.

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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.

Command code

STX

'0'

'7'

ETX

Command

H Freq.

V Freq.

STX

'4'

'E'

MSB

LSB

MSB

LSB

ETX