NEC RS-232C - Manual (Page 16)

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Check code
BCC: Block Check Code
Refer to the section 4.5
“Check code” for a BCC calculation.
Delimiter
CR (0Dh): End of packet
7. Power control procedure
7.1 Power status read
1) The controller requests the monitor to reply a current power status.
Header Message Check code Delimiter
SOH-'0'-Monitor ID-'0'-'A'-'0'-'6' STX-'0'-'1'-'D'-'6'-ETX BCC CR
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID from which you want to get status.
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 is 6 bytes.
Message
STX (02h): Start of Message
'0'-'1'-'D'-'6': Get power status 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 returns with the current power status.
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".
'1'-'2' (31h, 32h): Message length is 18 bytes.
Message
STX(02h):Start of Message
'0'-'2' (30h, 32h): Reserved data
'0'-'0' (30h, 30h): Result code
00: No Error.
01: Unsupported.
'D'-'6'(44h, 36h): Display power mode code
'0'-'0' (30h, 30h): Parameter type code is "Set parameter".
'0'-'0'-'0'-'4' (30h, 30h, 30h, 34h): Power mode is 4 types.
'0'-'0'-'0'-'1' (30h, 30h, 30h, 31h): Current power mode
Header Message Check code Delimiter
SOH-'0'-'0'-Monitor ID-'B'-'1'-'2' STX-'0'-'2'-'0'-'0'-'D'-'6'-'0'-'0'-'0'
-'0'-'0'-'4'-'0'-'0'-'0'-'1'-ETX BCC CR