NEC LCD Monitor, Manual

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15. Daylight Saving read & write
15.1 Daylight Saving Read
This command is used in order to read the setting of Daylight Saving.
1) The controller requests the monitor to reply a Daylight Saving setting.
Header Message Check code Delimiter
SOH-'0'-Monitor ID-
'0'-'A'-'0'-'8'
STX-'C'-'A'-'0'-'1'-'0'-'0'-ETX BCC CR
Header
SOH (01h): Start of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID of which you want to change a setting.
Ex.) If Monitor ID is '1', specify 'A'.
'0' (30h): Message sender is the controller.
'A' (41h): Message type is "Command".
'0'-'8'(30h, 38h): Message length (8bytes)
Message
STX (02h): Start of Message
'C'-'A'-'0'-'1' (43h, 41h, 30h, 31h): Daylight Saving Command
'0'-'0' (30h. 30h): Read
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'-'2'-'0'
STX-'C'-'B'-'0'-'1'-'0'-'0'-ST-BM-BD1-BD
-BT1-BT2-EM-ED1-ED2-ET1-ET2-TD-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
’
, replying monitor
’
s ID is
‘
1
’
.
'B' (42h): Message type is "Command reply".
'2'-'0'(32h, 30h): Message length (32bytes)
Message
STX (02h): Start of Message
'C'-'B'-'0'-'1' (43h, 42h, 30h, 31h): Daylight Saving Setting reply command
'0'-'0' (30h, 30h): Read
ST: Error Status
No Error : 00h (30h, 30h)
Error
: 01h (30h, 31h)
BM: BEGIN MONTH
JANUARY
–
DECEMBER: 01h (30h, 31h) - 12h (31h, 32h)
BD1: BEGIN DAY1
FIRST
: 01h (30h, 31h)
SECOND : 02h (30h, 32h)
THIRD
: 03h (30h, 33h)
FOUR : 04h (30h, 34h)