MD-215 Hardware
Display Control Interface
4-6
Downloading RGB Files
This feature returns the ECDIS RGB file that is currently saved to the EEPROM; consequently, it is only available
for type-approved ECDIS models.
VGA
Use the following commands for downloading RGB files from VGA input source.
Command
Description
DL?
Data: none (0 byte)
ACK: Total packet numbers (1 byte)
DLN
Data: Appointed packet (1 byte)
ACK: File content (30 bytes maximum, except for the last packet)
The command DL? will send a request to the micro controller and ask how many packets need to be
downloaded. The reply from the micro controller should be used when using the command DLN to download the
specific packets. Refer to the following section for detailed descriptions of the DL? and DLN.
Query the RGB File Size (in packets): DL? Command
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Hex
0x7
0xFF
0x44
0x4C
0x3F
0x0
0x2A
ASCII
D
L
?
Download the RGB File: DLN Command
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Byte 8
Hex
0x7
0xFF
0x44
0x4C
0x4E
0x1
0x1A
appointed
packet
0xAF
ASCII
D
L
N
Here is sample command to read and return packet zero of the RGB file:
0x07
0xFF
0x44
0x4C
0x4E
0x01
0x1A
0x00
0xFF
This is the ACK packet that is returned, with data packet 0 located in the Data section.
0x06
0xFF
0x44
0x4C
0x4E
0x20
0xFC
0x00
-
Data
IDCHK
This result shows the actual value of RGB file package 0. The results could be different for different machines.
DVI
Use the following commands for downloading RGB files from the DVI input source:
Command
Description
D2?
Data: none (0 byte)
ACK: Total packet numbers (1 byte)
D2N
Data: Appointed packet (1 byte)
ACK: File content (30 bytes maximum, except for the last packet)
The command D2? will send a request to the micro controller and ask how many packets need to be
downloaded. The reply from the micro controller should be used when using the command D2N to download
the specific packets. Refer to the following section for a detailed description of D2? and D2N.
Query the RGB File Size (in packets): D2? Command
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Hex
0x7
0xFF
0x44
0x4C
0x3F
0x0
0x2A
ASCII
D
2
?
