NEC UN552S External Controls - Page 104
Input Name Write
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20.2 Input Name Write This command is used in order to write the setting of Input Name. 1) The controller requests the monitor to write Input Name. Header Message SOH-'0'-Monitor ID'0'-'A'- LN(H)-LN(L) STX-'C'-'A'-'0'-'4'-'0'-1'Data(0)-Data(1)-Data(2)- --- -Data(n)-ETX Check code BCC Delimiter CR Header SOH (01h): Start of Header '0' (30h): Reserved Monitor ID: Specify the Monitor ID of which you want to change a setting. Ex.) If Monitor ID is '1', specify 'A'. '0' (30h): Message sender is the controller. 'A' (41h): Message type is "Command". LN(H)-LN(L): Message length (byte length), from STX to ETX Ex.) The byte data 20h is encoded as ASCII characters '2' and '0' (32h and 30h). Message STX (02h): Start of Message 'C'-'A'-'0'-'4' (43h, 41h, 30h, 34h): Input name Command '0'-'1' (30h, 31h): Write Data(n) : Input name *n = Max 14 The byte data 20h is encoded as ASCII characters '2' and '0' (32h and 30h). Ex.) In the case of Input Name "VGA" Step1: Input Name data is handled as character code. Example: "VGA" -> 56h 47h 41h (ASCII) Step2: The hexadecimal value of each original character is encoded as two ASCII characters representing the value. Example: 56h 47h 41h -> '5'-'6'-'4'-'7'-'4'-'1' Result: The following data is assigned to Data(n). 35h 36h 34h 37h 34h 31h ETX (03h): End of Message Check code BCC: Block Check Code Refer to the section 4.3 "Check code" for a BCC calculation. Delimiter CR (0Dh): End of packet 2) The monitor replies a written in result. Header Message SOH-'0'-'0'-Monitor ID- STX-'C'-'B'-'0'-'0'-'0'-'1'-ST-ETX 'B'-'0'-'A' Check code Delimiter BCC CR Header SOH (01h): Start of Header '0' (30h): Reserved '0' (30h): Message receiver is the controller. Monitor ID: Indicate a replying Monitor ID. Ex.) When this byte is set to 'A', replying monitor's ID is '1'. 'B' (42h): Message type is "Command reply". '0'-'A'(30h, 41h): Message length (10bytes) Message STX (02h): Start of Message 'C'-'B'-'0'-'4' (43h, 42h, 30h, 34h): Input name Command '0'-'1' (30h, 31h): Write (104/145)