Seanet Pro Operation
Gemini 720is Imaging Sonar
Document: 0703-SOM-00002, Issue: 7
66
© Tritech International Ltd.
Click on
Setup
in the
Action
column to open the
Gemini Cfg Setup
dialog.
Gemini Cfg Setup
Velocimeter Mode
Set to 'Auto' to apply the in-built velocimeter speed of sound
calculation to the sonar data. Set to 'Manual' to revert to a fixed
speed of sound. This fixed speed of sound is the manual V.O.S.
(Velocity Of Sound) setting configured in the Environment dialog
from within Seanet Pro.
Ping Setup
The two modes of operation are
Triggered
and
Continuous
.
In
Triggered
mode the Gemini will be sent continual triggers
where one trigger will instruct the Gemini to ping once. Each time
Seanet receives data for the current scan, it will respond and send
the next trigger to the Gemini to instruct it to perform the next ping.
This turnaround is half duplex in nature. In
Continuous
mode,
Seanet Pro sends one command at start-up which instructs the
Gemini Sonar to ping continuously. For both modes an inter-ping
time delay is also sent to the Sonar to control the scan update rate.
This
InterPing Period
is set in the
Setup
dialog accessed
through the
Tools
menu in Seanet Pro.
Note that for the Gemini 720is only the
Triggered
mode is
supported.
VDSL Rate Adaption
The Seanet Pro software allows three different settings to be
applied to the VDSL link, to cope with different levels of electrical
noise experienced by the cable to the Sonar. The dropdown menu
allows selection of ‘Normal’, ‘Medium Noise’ and ‘High Noise’.
Aux Port A / B
The Gemini 720is contains two additional data ports capable of
bi-directional communication. At present Seanet Pro is only able
to process one of the ports, so the
En
checkbox determines which
Port is actively being used.
Port A is capable of support RS232 or RS485 data
communications. Port B can only support RS232. Both ports are
able to support baud rates between 9600 and 115200, which the
drop down selection being used to confirm the required data rate.
Data being passed through the Gemini will be automatically
decoded by Seanet Pro and displayed in the Gemini application
window to the right of the sonar controls. The data can also be
outputted via the REMV4 program.
Note
Only change
VDSL Rate Adaption
if difficulties are being experienced
communicating with the Gemini Sonar. Whenever a
Medium Noise
or
High Noise
setting is selected, on initial startup of the Gemini, the VDSL
communications will take several seconds to find it’s optimum rate. During this
