16
Serial/Ethernet Communication (SCOM) Interface
IND100084-14
Example:
Command for query num of packets:
0x07 0xFF 0x44 0x4C 0x3F 0x00 0x2A
Acknowledge: DL? indicates 4 available packets:
0x06 0xFF 0x44 0x4C 0x3F 0x01 0x2A 0x03 0xFC
Tip for knowing which Slot that contains possible ECDIS table if DL? command responds NAK (negative response), is
to send a Query "MCC" command prior to a "DL?" query. Follow the procedure below.
1: Send MCC Gamma (Calibration) Select Query "?":
0x07 0xFF 0x4D 0x43 0x43 0x02 0x24 0x9D 0x3F 0x23
2: MCC reponds with an ASCII value, indicating what Calibration Mode is set (ref. "OSD ID" from previous page):
MMD : "0" = Calibration VGA
"1" = Calibration DVI
"2" = No Calibration
STD : "1" = Calibration VGA
"2" = No Calibration
3: If "MCC" response value is either 0 or 1, it means the unit has been calibrated from factory and that a ECDIS table
is most likely available in that slot and you can issue a DL? command with positive response, however note that this
setting is part of the OSD menu functions, and it can be changed manually by users at any time, naturally making
the response "false" or "true".
4: If "DL?" command still responds NAK, you could try the opposite value of 0 or 1 (depending on what result you get
via STEP 2 above) to determine if the OSD setting was set wrong. In order to set the OSD setting, you should issue
a manual "MCC" command again, forcing the unit to enter the opposite Calibration mode.
Send MCC Gamma (Calibration) Select "0":
0x07 0xFF 0x4D 0x43 0x43 0x02 0x24 0x9D 0x30 0x32
Unit is now in Calibration VGA mode, then try "DL?" command again.
or Send MCC Gamma (Calibration) Select "1":
0x07 0xFF 0x4D 0x43 0x43 0x02 0x24 0x9D 0x31 0x31
Unit is now in Calibration DVI mode, then try "DL?" command again.
5: If both "DL?" command response with NAK in Step 4, it means there is no ECDIS table available for download.
6: If "DL?" command responded positive with amount of available packages, you can proceed to "DLN" command.
