NEC MultiSync C431 User Manual page 25

Check code
BCC: Block Check Code
Refer to the section 4.3 "Check code" for a BCC calculation.
Delimiter
CR (0Dh): End of packet
Step 3. The controller requests the monitor to send the temperature from the selected sensor.
Header
SOH-'0'-Monitor ID-
'0'-'C'-'0'-'6'
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 4.3 "Check code" for a BCC calculation.
Delimiter
CR (0Dh): End of packet
Step 4. The monitor replies a temperature of selected sensor.
Header
SOH-'0'-'0'-Monitor ID-
'D'-'1'-'2'
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.
Message
STX-'0'-'2'-'7'-'9'-ETX
Message
STX-'0'-'0'-'0'-'2'-'7'-'9'-'0'-'0'
-'F'-'F'-'F'-'F'-'0'-'0'-'3'-'2'-ETX
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Check Delimiter
code
BCC CR
Check
code
BCC
Delimiter
CR