NEC RS-232C manual Message block format, Stx, Etx, Msb Lsb

4.2 Message block format

Header

Message

Check code Delimiter

“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	OP code page		OP code			ETX
		Hi	Lo	Hi		Lo

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

OP

code

Type

Max value

Current Value

ETX

page

Hi

Lo

Hi

Lo

Hi

Lo

Hi

Lo

MSB

LSB

MSB

LSB

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			OP	code		Set	Value		ETX
		page
	Hi		Lo	Hi		Lo	MSB		LSB

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

OP code

Type

Max value

Requested setting

ETX

page

Value

Hi

Lo

Hi

Lo

Hi

Lo

Hi

Lo

MSB

LSB

MSB

LSB

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, such as “Save current settings”, “Get timing report”, “power control”, “Schedule”, etc. Refer to

(9/72)