NEC RS-232C Car Video System User 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 4.5 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
These data are encoded to ASCII characters strings.
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 Check code for a BCC calculation.
Delimiter
CR (0Dh): End of packet