Datawell 45100, Руководство пользователя

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4 Operation
This chapter describes the general operation of the RX-D2. For a description of the normal
operation of the RX-D2, refer to
paragraph 4.1 .
When the reception frequency needs to be changed, refer to paragraph 4.3 .
4.1 Receiving data
When the receiver is in normal operating mode, the current status of the receiver is shown on
the display (see figure 4.1). To correctly receive and decode the buoy signal, the receiver must
first “synchronize” with the buoy signal. The status of this process is shown by the messages on
the display. There are four messages defined:

“synchronizing”
This message indicates that the receiver is synchronizing. This message appears after the
receiver has been switched on, after the receiving frequency has been changed or when the
receiver has lost the buoy signal.

“checking sync”
This message indicates that the receiver has just (re)synchronized. The receiver is now
validating the buoy signal.

“heave: 0153 cm”
This message (see figure 4.1) indicates that the receiver is correctly synchronized and
receiving data. The heave value is the actual, real-time vertical displacement of the buoy.

“bad vector”
This message indicates a transmission error.
Figure 4.1. Receiving data.
Normally, after power up or loss of signal, the receiver will display “
synchronizing
” for some
time and then display “
checking sync
”. After the receiver has validated the synchronization
process, the “heave” messages will be displayed. If too many transmission errors are detected,
the receiver will try to resynchronize to the buoy signal.
NOTE: The process of synchronization can take anything between 30 seconds to several
minutes. The time needed to reach synchronization depends on several factors like
signal-strength, interference, noise bursts and type of buoy. During the synchronization process
it is possible that the display switches frequently between “
synchronizing
” and “
checking
sync
”. This is normal behaviour.