NEC LCD Monitor, Manual

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9. Date & Time read and write
9.1 Date & Time Read
This command is used in order to read the setting of Date & Time.
1) The controller requests the monitor to reply with the Date & Time.
Header Message Check code Delimiter
SOH-'0'-Monitor ID-
'0'-'A'-'0'-'6'
STX-'C'-'2'-'1'-'1'-ETX BCC CR
Header
SOH (01h): Start of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID of 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
Message
STX (02h): Start of Message
'C'-'2'-'1'-'1' (43h, 32h, 31h, 31h): Date & time read request 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 replies Date & Time to the controller.
Header Message Check code Delimiter
SOH-'0'-'0'-Monitor ID-
'B'-'1'-'4'
STX-'C'-'3'-'1'-'1'-
YY-MM-DD-WW-HH-MN-DS-ETX
BCC CR
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'-'4'(31h, 34h): Message length
Message
STX (02h): Start of Message
'C'-'3'-'1'-'1' (43h, 33h, 31h, 31h): Date & Time read reply command
'YY'-'MM'-'DD'-'WW'-'HH'-'MN'-'DS': Date & Time data
YY: Year (offset 2000)
'0'-'0'(30h, 30h): 2000
|
'6'-'3'(36h, 33h): 2099 (99 = 63h)
MM: Month
'0'-'1'(30h, 31h): January
|
'0'-'C'(30h, 43h): December
DD: Day
'0'-'1'(30h, 31h): 1
|
'1'-'E'(31h, 45h): 30(=1Eh)