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NEC RS-232C user manual Communication Format, Header block format fixed length

Models: RS-232C

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4. Communication Format

4. Communication Format

Header

Message

Check Code

Delimiter

The command packet consists of four parts, Header, Message, Check code and Delimiter.

Sequence of a typical procedure to control a monitor is as follows,

[A controller and a monitor, two-way communication composition figure]

Controller

Get Parameter

Delimiter

Check Code

Message

Header

Get Parameter Reply

Header

Message

Check Code

Set Parameter

Delimiter

Check Code

Message

Header

Set Parameter Reply

Header

Message

Check Code

Monitor

		The controller sends command to
		get a value from the monitor that
		you want to change.
	Delimiter	The monitor replies a current value
		of the requested item.
		The controller sends commands to
		set an adjusted value.
	Delimiter	The monitor replies to the
	Delimiter	controller for confirmation.
		controller for confirmation.

Get Parameter

Delimiter

Check Code

Message

Header

Get Parameter Reply

Header

Message

Check Code

Delimiter

Save Current Setting Command

Delimiter

Check Code

Message

Header

The controller sends command to get a value for confirmation.

The monitor replies an adjusted value.

The controller requests to store the adjusted value to the monitor.

Save Current Setting Command Reply

Header		Message		Check Code		Delimiter	The monitor replies to the

							controller for confirmation.

Command

Delimiter

Check Code

Message

Header

Command Reply

Header

Message

Check Code

The control does not suitable for above fixed protocol; use the proper command for each control. Please refer section 5.5 and section 7 to 13.

Delimiter The monitor replies a proper message defined for each control.

4.1 Header block format (fixed length)

Header

Message

Check code

Delimiter

SOH	Reserved	Destination	Source	Message	Message
SOH	'0'	Destination	Source	Type	Length
1st	2nd	3rd	4th	5th	6th -7th

1stbyte) SOH: Start of Header

ASCII SOH (01h)

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NEC RS-232C user manual Communication Format, Header block format fixed length

Contents

3.1 RS-232C Remote control 2. Connectors and wiring2.1 RS-232C Remote control 1. Application4. Communication Format 4.1 Header block format fixed length3rdbyte Destination Destination equipment ID. Receiver Check code Delimiter 4.2 Message block formatHeader MessageCheck code 4.5 Check codeHeader Message DelimiterMessage 4.6 DelimiterHeader Check code5.2 Get parameter reply 5. Message type5.1 Get current Parameter from a monitor 5.3 Set parameter 5.4 Set parameter reply 5.5.2 Get Timing Report and Timing reply 5.5 Commands5.5.1 Save Current Settings 5.5.3 NULL Message 6. Typical procedure example6.1. How to change the “Brightness” setting SOH-0-0-Monitor ID-D-1-2 Page Step 1. Select a temperature sensor which you want to read Delimiter CR 0Dh End of packet 7. Power control procedure 7.1 Power status read7.2 Power control 1 The controller requests the monitor to control monitor power8. Asset Data read and write 8.1 Asset Data Read Request and reply8.2 Asset Data write 9. Date & Time read and write 9.1 Date & Time Read1 The controller requests the monitor to write Date & Time This command is used in order to write the setting of the Date & Time9.2 Date & Time Write Message STX 02h Start of Message 10.1 Schedule Read This command is used in order to read the setting of the Schedule10. Schedule read and write 0-830h, 38h Message length Message STX 02h Start of Message 0-130h,31h VGA 0-230h,32h RGB/HV 0-330h,33h DVI 0-530h,35h Video1 Page 10.2 Schedule Write This command is used in order to write the setting of the Schedule 1 The controller requests the monitor to write ScheduleEX 0-130h, 31h Monday 0-430h, 34h Wednesday 2 The monitor replies a data for confirmation Page SOH-0-0-Monitor ID-B-0-C STX-C-3-1-5-ST-PG-EN-ETX1 The controller requests the monitor to write Schedule bit 4 Friday bit 5 Saturday bit 6 Sunday EX 0-130h, 31h Monday 1-731h, 37h 23 =17h 1-831h, 38h Off timer isnt set 11.1 Self-diagnosis status read This command is used in order to read the Self-diagnosis status11. Self diagnosis SOH 01h Start of Header 0 30h Reserved 12. Serial No. & Model Name Read This command is used in order to read a serial numberThis command is used in order to read the Model Name 12.1 Serial No. Read13. Security Lock 13.1 Security Lock ControlP1 Security Pass code 1st 0-030h, 30h SOH-0-MonitorID-0-A-1-0STX-C-2-1-D-EN-P1-P2-P3-P4-ETX P2 Security Pass code 2nd 0-030h, 30h0-130h, 31h Error C-3-1-D 43h, 33h, 31h, 44h Security Lock Control reply commandST-EN Lock condition result data ST Status 0-030h, 30h No error ETX 03h End of Message Check code BCC Block Check CodeAppendix A. Operation Code OP code TableADJUST AUDIO SCHDULEPage Information OSD OSD timer secondsMenu tree reset OSD Transparency7 Autooffset OptionAdvanced Terminate Temperature sensor Carbon footprint50/50 All data are subject to change without noticeRevised at Mar.25/2010