Unit installation

FS70 Trawl Sonar System
76 974-24007001/4.1
5.4.6 Telemetry Errors
In the normal operation of the FS Trawl Monitoring system
commands are sent from the processor unit down the trawl cable to
the trawl unit electronics and acknowledgments are then sent back
up to the processor unit. Some error checking of these commands is
performed to monitor the performance of the Uplink and Downlink
telemetry.
Telemetry errors can result from noise induced on the trawl cable
due to interference or problems with the 3
rd
wire trawl cable or
trawl unit electronics.
Though a few telemetry errors are quite common and acceptable, an
excessive number of errors will adversely affect the sonar operation
and may indicate a problem that will eventually cause a system
failure.
The most common type of telemetry errors is time-outs. This
problem indicates the trawl unit electronics are not responding to
the processor unit or the integrated sensor module is not responding
to the sonar head.
If the processor unit displays changes in the “Baud Rate”
(highlighted in red and flashing) the change indicates that the
Uplink signal to the processor may have a problem then refer to the
“Message Log” file and record the “Errors” including the cable gain
number values and make note of any other failure.
If no errors are recorded in the “Message Log” file, then re-set the
baud rate to 115.2 kbps and implement a system re-calibration.
Next record the results obtained. The changes may have been
caused by noise or other interference.
5.4.7 Diagnostic Recordings
The system will save your screen displays in three different ways.
Two of these ways are manually started by the operator and the
third is automatically managed by the system. All three methods
create files on the system which can be sent to your service provider
for analysis.