Message Block Format - NEC LCD Monitor Manual

4.2 Message block format

"Message block format" is allied to the "Message Type" in the "Header".
Refer to the section 6 "Message format" for more detail.
1)Get current parameter
The controller sends this message when you want to get the status of the monitor.
For the status that you want to get, specify the "OP code page" and "OP code",
refer to "Appendix A. Operation code table".
"Message format" of the "Get current parameter" is as follows,
STX

Refer to section 5.1 "Get current parameter from a monitor." for more details.
2)Get Parameter reply
The monitor will reply with the status of the requested item specified by the controller
in the "Get parameter message".
"Message format" of the "Get parameter reply" is as follows,
STX Result OP code
Hi Lo Hi

Refer to section 5.2 "Get parameter reply" for more details.
3)Set parameter
The controller sends this message to change a setting of the monitor.
Message format of the "Set parameter" is as follows,
STX OP code
page
Hi Lo

Refer to section 5.3 "Set parameter" for more details.
4)Set Parameter reply
The monitor replies with this message for a confirmation of the "Set parameter message".
Message format of the "Set parameter reply" is as follows,
STX Result OP code
page
Hi Lo Hi

Refer to section 5.4 "Set parameter reply" for more details.
5)Command
"Command message" format depends on each command.
Usually, this "command message" is used for some non-slider controls and some special operations,
Header
OP code OP code
page
Hi Lo Hi
OP code
page
Lo Hi Lo
OP code Set Value
Hi Lo MSB
OP code Type
Lo Hi Lo Hi
Message Check code
ETX
Lo
Type Max value
Hi Lo MSB
ETX
LSB
Max value
Lo MSB
(11/137)
Delimiter
Current Value
LSB MSB
Requested setting
Value
LSB MSB
ETX
LSB
ETX
LSB