Input Name Write - NEC MultiSync C431 User Manual

19.2 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
SOH-'0'-Monitor ID-
'0'-'A'- LN(H)-LN(L)
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.
Step2: The hexadecimal value of each original character is encoded as two ASCII
Result: The following data is assigned to Data(n).
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
SOH-'0'-'0'-Monitor ID-
'B'-'0'-'A'
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
STX-'C'-'A'-'0'-'4'-'0'-1'-
Data(0)-Data(1)-Data(2)- --- -Data(n)-ETX
Example:
"VGA" -> 56h 47h 41h (ASCII)
characters representing the value.
Example:
56h 47h 41h -> '5'-'6'-'4'-'7'-'4'-'1'
35h 36h 34h 37h 34h 31h
STX-'C'-'B'-'0'-'0'-'0'-'1'-ST-ETX
Message
Message
(83/104)
Check Delimiter
code
BCC CR
Check code Delimiter
BCC CR