Gemini 620pd Profiling Product Manual page 60

Troubleshooting
same subnet and the PC routing table needs to be set up so that packets are routed
correctly to the sonar. If the sonar is receiving ping requests then the IP address of
the PC will appear in the Connected IP Address field in the advanced settings
page of the software.
If the sonar is connected to the PC then the most likely cause is particularly bad packet
loss on the network between sonar and PC.
Update rate is slow and there are sometimes large gaps
between pings
VDSL System - The VDSL link is susceptible to electrical noise induced by turning
other devices on and off such as thrusters on an ROV. If the link keeps going down
try using the "Medium Noise" or "High Noise" VDSL setting in the advanced option.
Higher Noise settings trade off speed for reliability of the network link. This may
reduce the ping rate slightly but the link will be more reliable in the presence of noise.
Check all connectors on the VDSL twisted pair, poor contacts have been known to
cause this issue.
Ethernet System – There may be noise induced onto the Ethernet cables, be sure to
route these as far away as practicable from noise sources.
All Systems – Some poor quality PC network cards have problems with the large data
rate from the Gemini sonar and drop a significant amount of packets. If you have
large packet loss, try updated network card drivers and a different brand of network
card. Also check that the PC and graphics chipset meet the minimum specification.
Sonar goes offline while operating on deck
The sonar head outputs heat to the body casing (using it as a heatsink) which is
dissipated to the surrounding water during normal operation.
In order to protect the internal electronics from damage due to overheating a thermal
cut-off will shut down the sonar if it gets too warm. It will be necessary to allow the
unit to cool down before it will operate again.
The unit should not be operated out of water for extended periods.
0695-SOM-00001, Issue: 03
Note
The sonar will only respond to ping requests from IP addresses on the
same subnet as the sonar. Some firewalls have been known to cause this
issue. To view the computers routing table type route print from the
command line.
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Gemini Profiling System
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