Power control | NEC RS-232C specs

7.2Power control

1)The controller requests the monitor to control monitor power.

Header	Message	Check code	Delimiter
SOH-'0'-Monitor ID-'0'-'A'-'0'-'C'	STX-'C'-'2'-'0'-'3'-'D'-'6'-	BCC	CR

'0'-'0'-'0'-'1'-ETX

Header

SOH (01h): Start Of Header

'0' (30h): Reserved

Monitor ID: Specify the Monitor ID which you want to change a setting. Ex.) If Monitor ID is '1', specify 'A'.

'0' (30h): Message sender is the controller.

'A' (41h): Message type is "Command".

'0'-'C (30h, 43h): Message length is 12 bytes.

Message

STX (02h): Start of Message

'C'-'2'-'0'-'3'-'D'-'6' (43h, 32h, 30h, 33h, 44h, 36h): power control command

'0'-'0'-'0'-'1' (30h, 30h, 30h, 31h): Power mode 0001: ON

0002, 0003: Do not set.

0004: OFF (same as the power off by IR)

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 a data for confirmation.

Header	Message	Check ode	Delimiter
SOH-'0'-'0'-Monitor	STX-'0'-'0'-'C'-'2'-'0'-'3'-'D'-'6'-	BCC	CR
ID-'B'-'0'-'E'	'0'-'0'-'0'-'1'-ETX

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 written to 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

'0'-'0' (30h, 30h): Result code. No error.

'C'-'2’,'0'-'3'-'D'-'6' (43h, 32h, 30h, 33h, 44h, 36h): power control reply command

The monitor replies same as power control command to the controller. '0'-'0'-'0'-'1' (30h, 30h, 30h, 31h): Power mode

0001: ON