Edgetech 2000-TVD, User Hardware Manual

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and, if possible, the current drain with an inline connection. Cable current should be between 120mA
(Idle) and 250mA.
The topside units supply 400VDC to the tow cable. The voltage at the towfish end of the cable must be
not less than 300VDC to start the system and not be less than 200V during operation.
6.3.5 Command and Data Link
To check that the command and data link over the tow cable is operational, start the Remote Desktop
application on the topside control computer. There is normally a shortcut on the EdgeTech Desktop for
this. The towfish's PC screen should appear in a window on the topside computer screen. This will appear
as a yellow desktop with the sonar application dialog box visible. If this is successful, then the command
link is working.
6.3.6 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 (vehicle 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 towfish 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.
Figure 6-1: SockBlast Window
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 (towfish) 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