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4.2 Message block format Header Message Check code Delimiter “Message block format ” is allied to the “Message Type” in the “Header”. Refer to the section 6 “Message format” for more detail. 1 Get current parameter The controller sends this message when you want to get the status of the monitor. For the status that you want to get, specify the “OP code page ” and “OP code”, refer to “Appendix A. Operation code table”. “Message format” of the “Get current parameter” is as follows, OP
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section 5.5 “Commands message ” for more details. 6 Command reply The monitor replies to a query from the controller. “Command reply message ” format depends on each command. Refer to section 5.5 “Commands message” for more details. (10/72)
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Check code Header Message Delimiter 4.3 Check code Check code is the Block Check Code (BCC) between the Header and the End of Message except SOH. 7 6 5 4 3 2 1 0 2 2 2 2 2 2 2 2 SOH D 0 Reserved D 1 Destination D 2 Source D 3 Type D 4 Length(H) D 5 Length(L) D 6 STX D 7 Data D 8 | | | | ETX D n Check code D P P P P P P P P n+1 D = D XOR D XOR D XOR ,,, D n
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Delimiter Header Message Check code 4.4 Delimiter Packet delimiter code; ASCII CR(0Dh). (12/72)
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5. Message type 5.1 Get current Parameter from a monitor. OP code page OP code STX ETX Hi Lo Hi Lo st nd rd th th th 1 2 -3 4 –5 6 Send this message when you want to get the status of a monitor. For the status that you want to get, specify the “OP code page ” the “OP code ”, refer to “Appendix A. Operation code table ”. st 1 byte) STX: Start of Message ASCII STX (02h) nd rd 2 -3 bytes) OP code page: Operation code page. Specify the “OP code page ” for the control which you wa
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5.2 "Get parameter" reply Result OP code page OP code Type Max value Current Value STX ETX Hi Lo Hi Lo Hi Lo Hi Lo MSB LSB MSB LSB st nd rd th th th th th th th th th th th 1 2 -3 4 –5 6 –7 8 -9 10 -13 14 -17 18 The monitor replies with a current value and the status of the requested item (operation code). st 1 byte) STX: Start of Message ASCII STX (02h) nd rd 2 -3 bytes) Result code. These bytes indicate a result of the requested commands as follows, 00h: No Error. 01h: Unsu
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5.3 Set parameter OP code page OP code Set Value STX ETX Hi Lo Hi Lo MSB LSB st nd rd th th th th th 1 2 -3 4 -5 6 -9 10 Send this message to change monitor ’s adjustment and so on. The controller requests a monitor to change value. st 1 byte) STX: Start of Message ASCII STX (02h) nd rd 2 -3 bytes) OP code page: Operation code page This OP code page data must be encoded to ASCII characters. Ex.) The byte data 02h must be encoded to ASCII '0' and '2' (30h and 32h). Refer to
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5.4 "Set parameter" reply Requested setting Result OP code page OP code Type Max value STX Value ETX Hi Lo Hi Lo Hi Lo Hi Lo MSB LSB MSB LSB st nd rd th th th th th th th th th th th 1 2 -3 4 -5 6 -7 8 -9 10 -13 14 -17 18 The Monitor echoes back the parameter and status of the requested operation code. st 1 byte) STX: Start of Message ASCII STX (02h) nd rd 2 -3 bytes) Result code ASCII '0''0' (30h, 30h): No Error. ASCII '0''1' (30h, 31h): Unsupported operation with this monit
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5.5 Commands "Command message format" depends on each command. Some commands are shown with usage. Refer to section 7 to 13. 5.5.1 Save Current Settings. The controller requests for the monitor to store the adjusted value. Command code STX ETX '0' 'C' Send "OC"(30h, 43h) as Save current settings command. Complete "Save Current setting" command packet as follows; ASCII: 01h-30h-41h-30h-41h-30h-34h-02h-30h-43h-03h-CHK-0Dh SOH-'0'-'A'-'0'-'A'-'0'-'4'-STX-'0'-'C'-ETX-CHK- CR
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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; Command SS H Freq. V Freq. STX ETX '4' 'E' Hi Lo MSB LSB MSB
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5.5.3 NULL Message Command code STX 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. Comp
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IV. Control Commands 6. Typical procedure example The following is a sample of procedures to control the monitor, these are examples of "Get parameter", "Set parameter" and "Save current settings". 6.1. How to change the “Backlight” setting. Step 1. The controller requests the Monitor to reply with the current brightness setting and capability to support this operation. (Get parameter) Header Message Check code Delimiter SOH-'0'-Monitor ID-'0'-'C'-'0'-'6' STX-'0'-'0'-'1'-'0'-ETX BCC CR
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EXTERNAL CONTROL NEC LCD Monitor
Rev.3.5
INDEX
I. Application ................................................................................3
II. Preparation ...............................................................................4
2. Connectors and wiring....................................................................4
2.1 RS-232C Remote control ...............................................................4
2.2 LAN control.......................................
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9. Date & Time read and write ..............................................................44 9.1 Date & Time Read ....................................................................44 9.2 Date & Time Write....................................................................46 10. Schedule read and write ................................................................49 10.1 Schedule Read......................................................................49 10.2 Schedule Write...........
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I. Application This document defines the communications method for control of the NEC LCD monitor, MultiSync P402 /P462 /P552 /P702 /V422 /V462 /V551 /V651 /V322 /V652 /V552 /X461S /X551S /X401S /X463UN /X551UN /V463 /V423 when using an external controller. (3/72)
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II. Preparation 2. Connectors and wiring 2.1 RS-232C Remote control Connector: 9-pin D-Sub Cable: Cross (reversed) cable or null modem cable (Please refer “Controlling the LCD monitor via RS-232C Remote control” on User’s manual.) 2.2 LAN control Connector: RJ-45 10/100 BASE-T Cable: Category 5 or higher LAN cable (Please refer “Controlling the LCD monitor via LAN control ” on User’s manual.) (4/72)
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III. Communication specification 3. Communication Parameter 3.1 RS-232C Remote control (1) Communication system Asynchronous (2) Interface RS-232C (3) Baud rate 9600bps (4) Data length 8bits (5) Parity None (6) Stop bit 1 bit (7) Communication code ASCII 3.2 LAN control (1) Communication system TCP/IP (Internet protocol suite) (2) Interface Ethernet (CSMA/CD) (3) Communication layer Transport layer (TCP) * Using the payload of TCP segment. (4) IP address (De
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4. Communication Format Header Message Check Code Delimiter The command packet consists of four parts, Header, Message, Check code and Delimiter. Recommended sequence of a typical procedure to control a monitor is as follows, [A controller and a monitor, two-way communication composition figure] For the general command (see the part "6.3. Operation Code (OP code) Table ”) Controller Monitor Get Parameter The controller sends command to Check Code Header Message Del
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Header Message Check code Delimiter 4.1 Header block format (fixed length) Reserved Message Message SOH Destination Source '0' Type Length st nd rd th th th th 1 2 3 4 5 6 -7 st 1 byte) SOH: Start of Header ASCII SOH (01h) nd 2 byte) Reserved: Reserved for future extensions. On this monitor, it must be ASCII '0'(30h). rd 3 byte) Destination: Destination equipment ID. (Receiver) Specify a commands receiver ’s address. The controller sets the “MONITOR ID ” or “GROUP ID ”
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'A'(41h). If you want to control all of the monitors which are connected by a daisy chain, specify a destination address ‘ ’(2Ah). th 4 byte) Source: Source equipment ID. (Sender) Specify a sender address. The controller must be ‘0 ’ (30h). On the reply, the monitor sets the own MONITOR ID in here. th 5 byte) Message Type: (Case sensitive.) Refer to section 4.2 “Message block format” for more details. ASCII 'A' (41h): Command. ASCII 'B' (42h): Command reply. ASCII 'C' (43h): G
