NEC X754HB, Manual

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12.2 Model Name Read
This command is used in order to read the Model Name.
1) The controller requests the monitor to read Model Name.
Header Message Check code Delimiter
SOH-'0'-Monitor ID-
'0'-'A'-'0'-'6'
STX-'C'-'2'-'1'-'7'-ETX BCC CR
Header
SOH (01h): Start of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID which you want to get Model Name.
Ex.) If Monitor ID is '1', specify 'A'.
'0' (30h): Message sender is the controller.
'A' (41h): Message type is "Command".
'0'-'6'(30h, 36h): Message length
Message
STX (02h): Start of Message
'C'-'2'-'1'-'7' (43h, 32h, 31h, 37h): Model Name command
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 the model name data to the controller.
Header Message Check code Delimiter
SOH-'0'-'0'-Monitor ID-
'B'-N-N
STX-'C'-'3'-'1'-'7'-
Data(0) -Data(1)—----Data(n)-ETX
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', the replying Monitor ID is '1'.
'B' (42h): Message type is "Command reply".
N-N: Message length
Note.) The maximum data length that can be returned from the monitor at a time is
32bytes.
Ex.) The byte data 20h is encoded as ASCII characters '2' and '0' (32h and 30h).
Message
STX (02h): Start of Message
'C'-'3'-'1'-'7' (43h, 33h, 31h, 37h): Model Name reply Command
Data(0) -Data(1)----Data(n):Model name
Ø
The byte data 20h is encoded as ASCII characters '2' and '0' (32h and 30h).
Ex.) Foe example when receiving Model Name data 35h 30h 33h 34h 33h 30h 33h 33h
Step1: Model Name data is encoded character string.
Example:
35h 30h 33h 34h 33h 30h 33h 33h -> '5','0','3','4','3','0','3','3'
Step2: Decode pairs of ASCII characters to hexadecimal values.
Example:
'5','0','3','4','3','0','3','3' -> 50h 34h 30h 33h
Step3: Byte data represents the ASCII string data.
Example:
50h 34h 30h 33h -> "P403"
Result: Model Name is "P403".
Note: No null termination character is sent.
ETX (03h): End of Message
Check code
BCC: Block Check Code