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7.2.2.5
Data link
A good, quick qualitative test of the data link and towfish electronics is to perform a rub test on
each transducer. Set the Range to 200 meters for both frequencies and start the system running
in HDM mode for both. Set screen gain to +30dB for both frequencies and briskly rub each aft
transducer face one at a time. A dark band should appear on the sonar processor screen
corresponding to the side rubbed.
Data throughput rates on the uplink (fish to topside) can be critical in getting smooth data from
the towfish. The data throughput rate can be checked using Edgetech supplied utilities at each
end of the link
The SockBlast application is used to test network throughput between the 4200FS fish and the
topside computer. This application is normally kept in C:\EdgeTech\Utilities folder on the
topside unit, and D:\EdgeTech\Utilities folder on the towfish.
Two copies must be run one on each computer. One serves as the client (topside) and the other
as the server (towfish). Since the client connects to the server, the Create Client (topside)
address must be the TCP/IP address of the server (fish) machine, which is 192.9.0.99. The
towfish Create Server address should be 0.0.0.0.
After pressing the Create buttons to start the server and clients on their respective machines, the
two applications hook up, then the Client count on the towfish should increment from 0 to 1 and
the Server count on the topside should increment to 1 as well. This indicates that there is one
connection between the two applications
Check the Server Send Data box on the towfish. A performance in MB/second will be
displayed. This should be more than 0.35Mbyte/s.
7.2.2.6
Towfish
It is recommended that all attempts be made to see if a problem is external to the towfish
before opening it.
First verify that the command and data links between the towfish and topside are working per
above.
Warning
High Voltage (400 VDC) is Always Present
in the Electronics Assembly when powered.
