23
Figure 15. Message notifying that a file with the same name already exists
Care should be taken when selecting
Append
. This option is normally used only
if the downloading process has for some reason been interrupted and you want it
to be resumed.
The warning ‘
Last warning: Waiting for the 1st block
’ appearing in the status bar while downloading a
log file (Figure 16) indicates that PC-CDU cannot for some reason retrieve the next block of data
from the receiver. The field
Retries
shows how many attempts to retrieve this block of data have
been made so far.
Figure 16. Message notifying that a problem occurred while retrieving the current block
of data from the receiver
If such a problem occurs, you may need to try a higher baud rate and/or a smaller block size.
Usually, the larger the block size the more efficient the data transfer. On the other
hand, if the connection between the computer and receiver is not reliable enough,
reducing the block size can often help to exclude or at least minimize communica-
tion errors.
Receiver data can also be transferred to the computer via the parallel port, which normally allows a
fifteen to twenty-fold reduction in the data transfer time as compared to the serial ports. There are
