(18/56)
To tell the controller that the monitor does not have any answer to give to the host (not
ready or not expected)
Complete "NULL Message" command packet as follows;
(The destination “A” (monitor ID of 1) is only an example. It should be changed according
to the target monitor ID)
01h-30h-30h-41h-41h-30h-34h—02h-42h-45h-03h-CHK-0Dh
SOH-'0'-'0'-'A'-'A'-'0'-'4'-STX-'B'-'E'-ETX-CHK- CR
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 “Brightness” 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'-'A'-'0'-'C'-'0'-'6' STX-'0'-'0'-'1'-'0'-ETX
BCC
CR
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'A' (41h): Monitor ID
If the command should be sent to certain monitor only, the either of character ‘A’(41h) to ‘Z’(5Ah)
which is corresponding to monitor ID from No1 to No.26 should be set to this portion. If it is
a broad cast command(only “set command” is available), then the ’*’(2Ah)should be applied.
'0' (30h): Message sender is the controller
'C' (43h): Message is "Get parameter command"
'0'-'6' (30h, 36h): Message length is 6 bytes
Message
STX (02h): Start of Message
'0'-'0' (30h, 30h): Operation code page number is 0
'1'-'0' (31h, 30h): Operation code is 10h (in the OP code page 0)
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
Step 2. The monitor replies with current Brightness setting and capability to support this operation.
(If command is sent as “Broadcast” then no reply should be sent back.)
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller
'A' (41h): Monitor ID
This portion should depend on the monitor ID of Monitor.( ’A’(41h)-‘Z’(5Ah))
'D' (44h): Message Type is "Get parameter reply"
'1'-'2' (31h, 32h): Message length is 18 bytes
Header Message
Check
code
Delimiter
SOH-'0'-'0'-'A'-'D'-'1'-'2' STX-'0'-'0'-'0'-'0'-'1'-'0'-'0'-'0'
-'0'-'0'-'6'-'4'-'0'-'0'-'3'-'2'-ETX
BCC CR
