NEC E437Q External Controls - Page 18

5.5 Commands "Command message format" depends on each command. Some commands are shown with usage. Refer to section 7 to 25. 5.5.2 Get Timing Report and Timing reply. The controller requests the monitor to report the displayed image timing. Command code STX ETX '0' '7'  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; STX Command SS H Freq. V Freq. ETX '4' 'E' Hi Lo MSB LSB MSB LSB  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. (18/47)