NEC RS-232C manual Null Message

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5.5.3 NULL Message

	STX	Command code		ETX
		'B'	'E'

The NULL message returned from the monitor is used in the following cases;

To tell the controller that the monitor does not have any answer to give to the host (not ready or not expected)

Following operations need a certain time for to execute, so the monitor will return this message when another message is received during execution.

Power ON, Power OFF, Auto Setup, Input, PIP Input, Auto Setup and Factory reset.

Complete "NULL Message" command packet as follows; 01h-30h-30h-41h-42h-30h-34h-02h-42h-45h-03h-CHK-0Dh SOH-'0'-'0'-'A'-'B'-'0'-'4'-STX-'B'-'E'-ETX-CHK- CR

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Contents External Control 10.1 Application RS-232C Remote control II. Preparation Connectors and wiringLAN control Ascii Communication timingGet Parameter Reply Monitor Communication FormatALL Header block format fixed lengthPage MSB LSB Message block formatSTX ETX10/72 SOH Check codeDelimiter Get current Parameter from a monitor Message typeGet parameter reply 00h No ErrorETX MSB LSB Set parameterCurrent condition Set parameter replySave Current Settings CommandsGet Timing Report and Timing reply  Send 0730h, 37h as Get Timing Report commandNull Message How to change the Backlight setting IV. Control Commands Typical procedure exampleBCC Message Check code Delimiter Header Message Check code Delimiter SOH-0-Monitor ID-0-E-0-A STX-0-2-7-8-0-0-0-1-ETX SOH-0-Monitor ID-0-C-0-6 STX-0-2-7-9-ETX Readout value is 2s complement Dicom SIM Operation Code OP code TablePosition 00h 20h Left side OP code Parameter Remarks Cod Pag Input Resolution DAh Hdmi SurroundPIP RGB/HVOSD 02h 7Dh None IP ON/PROGRESSIVE DVI-PCDVI-HD ScartPIP ON/OFF Mute Unmute Screen MuteScreen Mute on Screen Mute OFF MTS ‘SURROUND’OP code Parameter Remarks Cod Pag PIP Input 02h 73h No mean Power status read Power control procedureCR 0Dh End of packet 37/72 Controller requests the monitor to control monitor power Power controlDelimiter CR 0Dh End of packet 39/72 Asset Data Read Request and reply Asset Data read and writeDelimiter CR 0Dh End of packet 41/72 Asset Data write CR 0Dh End of packet 43/72 Date & Time Read Date & Time read and writeBCC DS-ETX MN Minutes 0-030h, 30h Date & Time Write Check code Delimiter Delimiter CR 0Dh End of packet 48/72 Schedule Read Schedule read and writeB33h, 42h C33h, 43h On timer isnt set Page BCC OFF HOUR-OFF MIN-INPUT-WD-FL-ETX B33h, 42h 59 =3Bh C33h, 43h Off timer isn’t set Schedule Write PG-ON HOURS-ON MIN-OFF HOURS-OFF MIN-INPUT-WD-FL-P ModePage BCC OFF HOUR-OFF MIN-INPUT-WD-FL-P Mode 57/72 SOH-0-Monitor ID-0-A-0-A STX-C-2-1-5-PG-EN-ETX Delimiter CR 0Dh End of packet 59/72 STX-C-2-1-4-PG-ON HOUR-ON MIN SOH-0-0-Monitor ID-B-1-8 STX-C-3-1-4-ST-PG-ON HOUR-ON MIN 030h, 30h 731h, 37h 23 =17h 831h, 38h Off timer isnt set SOH-0-0-Monitor ID-B-0-C STX-C-3-1-5-ST-PG-EN-ETX Self-diagnosis status read Self diagnosisPage Serial No. Read Serial No. & Model Name ReadModel Name Read Security Lock Control Security LockSTX-C-3-1-D-ST-EN-ETX Direct TV Chanel Read & Reply Direct TV Chanel Read & WriteDirect TV Chanel Write & Reply All data are subject to change without notice

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