Furuno RC-1500-1T - Manual (Page 346)

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RSB: Retransmission still being attempted
TMD: Maximum number of addresses exceeded
UNK: Unknown status (for example when the Logical
channel number is zero)
Note: Some LES do not use certain codes.
Manually requesting delivery status
You can request a LES for delivery status of a message you have
transmitted there within the past 24 hours.
1. Press [F3].
2. Press [3] to display the Request Delivery Status display.
Figure 4-24 Request delivery status display
3. Select a file.
4. Press [Enter]. A prompt asks you if you want to request delivery
status on that message.
Figure 4-25 Sample message file list
5. Press [Enter] to request status. “Request started” appears on the
display. (To cancel request, select “No” and press [Enter].)
6. “Press any key.” appears on the display; press any key to return to
the standby display.
Several minutes later the reply from the LES appears in the Delivery
column of the Request Delivery Status screen.