NEC LCD Monitor, Руководство пользователя

Страница: 46 / 137

(46/137)
8. Asset Data read and write
MultiSync P403/ P463 /P553 have the area for to store user
’
s asset data of up to 64bytes.
8.1 Asset Data Read Request and reply
This command is used in order to read Asset Data.
1) The controller requests the monitor to reply with Asset data.
Header Message Check code Delimiter
SOH-'0'-Monitor ID-
'0'-'A'-'0'-'A'
STX-'C'-'0'-'0'-'B'-
'0'-'0'-'2'-'0'-ETX
BCC CR
Header
SOH (01h): Start of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID from which you want to get data.
Ex.) If Monitor ID is '1', specify 'A'.
'0' (30h): Message sender is the controller.
'A' (41h): Message type is "Command".
'0'-'A' (30h, 41h): Message length is 10 bytes.
Message
STX (02h): Start of Message
'C'-'0'-'0'-'B' (43h, 30h, 30h, 42h): Asset read request command.
'0'-'0' (30h, 30h): Offset data from top of the Asset data.
At first set 00h: Read data from the top of Asset data area.
'2'-'0' (32h, 30h): Read out data length is 32bytes.
Secondly set 20h: Read data from the 32bytes offset point in the Asset data area.
Maximum readout length is 32bytes at a time.
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 Asset data to the controller.
Header Message Check code Delimiter
SOH-'0'-'0'-Monitor ID-
'B'-N-N
STX-'C'-'1'-'0'-'B'-
Data(0)-Data(1)---Data(N)-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"
N-N: Message length
Note.) This length includes STX and ETX.
Message
STX (02h): Start of Message
'C'-'1'-'0'-'B' (43h, 31h, 30h, 42h): Asset read reply command
Data(0)
–
Data(N): Retuned Asset data
Ex.) When Data(n) is 1234h, replying data is (31h 32h, 33h, 34h).
ETX (03h): End of Message
Check code
BCC: Block Check Code