NEC C981Q External Controls - Page 26

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' Message STX-'0'-'2'-'7'-'9'-ETX Check code BCC Delimiter 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 4.3 "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' Message STX-'0'-'0'-'0'-'2'-'7'-'9'-'0'-'0' -'F'-'F'-'F'-'F'-'0'-'0'-'3'-'2'-ETX Check code BCC 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. Delimiter CR (26/145)