NEC RS-232C User Manual
Page 15
(15/50)
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
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.
ETX (03h): End of Message
Header
Message
Check code
Delimiter
SOH-'0'-'0'-Monitor ID-'D'-'1'-'2'
STX-'0'-'0'-'0'-'2'-'7'-'9'-'0'-'0'
-'F'-'F'-'F'-'F'-'0'-'0'-'3'-'2'-ETX
BCC
CR
Readout value
Temperature
[Celsius]
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