NEC RS-232C user manual STX-0-0-0-2-7-9-0-0

Delimiter

CR (0Dh): End of packet

Step 3. The controller requests the monitor to send the temperature from the selected sensor.

	Header	Message	Check code	Delimiter
SOH-'0'-Monitor ID-'0'-'C'-'0'-'6'		STX-'0'-'2'-'7'-'9'-ETX	BCC	CR
Header
SOH	(01h): Start of Header
'0'	(30h): Reserved

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

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

'C' (43h): Message Type is "Get parameter".

'0'-'6' (30h, 36h): Message length is 6 bytes.

Message

STX (02h): Start of Message

'0'-'2' (30h, 32h): Operation code page number is 2.

'7'-'9' (37h, 39h): Operation code is 79h (in the page 2).

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 4. The monitor replies a temperature of selected sensor.

Header						Message			Check code	Delimiter
SOH-'0'-'0'-Monitor ID-'D'-'1'-'2'			STX-'0'-'0'-'0'-'2'-'7'-'9'-'0'-'0'						BCC	CR
			-'F'-'F'-'F'-'F'-'0'-'0'-'3'-'2'-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'.
'D' (44h): Message Type is "Get parameter reply".
'1'-'2' (31h, 32h): Message length is 18 bytes.
Message
STX (02h): Start of Message
'0'-'0' (30h, 30h): Result code. No error.
'0'-'2' (30h, 32h): Operation code page number is 2.
'7'-'9' (37h, 39h): Operation code is 79h (in the page 2).
'0'-'0' (30h, 30h): This operation is "Set parameter" type.
'F'-'F'-'F'-'F' (46h, 46h, 46h, 46h): Maximum value.
'0'-'0'-'3'-'2' (30h, 30h, 33h, 32h): The temperature is 25 degrees Celsius.
		Readout value is 2's complement.
	Temperature [Celsius]			Readout value
				Binary				Hexadecimal
	+125.0			0000 0000 1111 1010				00FAh
	+	25.0		0000	0000	0011	0010	0032h
	+	0.5		0000	0000	0000	0001	0001h
	0			0000	0000	0000	0000	0000h
	-	0.5		1111	1111	1111	1111	FFFFh
	-	25.0		1111	1111	1100	1110	FFCEh
	-	55.0		1111	1111	1001	0010	FF92h

ETX (03h): End of Message

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