1-5
1.3.1.3 701-DL Digital Link
The 701-DL Digital Link is intended for permanent mounting and is made for users who prefer to supply a
processing unit that has Edgetech’s DIscover or a third-party sonar acquisition software installed.
The system includes tow vehicle and DC power supplies, ADSL modem, and an Ethernet switch, all within
a single 19-inch 2U rack. The 701-DL interfaces with a user-supplied computer over a 10/100BaseT
Ethernet connection.
1.3.2 Tow Vehicles
4200 Tow Vehicle contains the sonar transducer arrays and electronics required to transmit and receive
sonar signals; to receive the downlink commands from the topside processor; and to provide the uplink
side scan data, sensor data, and status information to the topside processor. The 4200 Series Tow Vehicles
come in either single-pulse (SP) or multi-pulse (MP) configurations.
The electronics are contained inside a single housing to which the transducer arrays are attached. Where
the aft end cap contains bulkhead connectors for connecting to the transducer arrays, a double O-ring
sealed end cap is attached to each end of the housing to seal it. The six-pin main I/O connector and eight-
pin option connector are located on top of the tow vehicle. The tow vehicle interfaces with the topside
processor over a tow cable’s 10/100BaseT Ethernet connection using digital subscriber line (ADSL)
modems in both the tow vehicle and the processor.
The 4200 is portable, configurable, and hydrodynamic. Each configuration is equipped with stabilizer fins
and a lead nose weight for hydrodynamic balance. A towing arm is rigidly mounted to a tow point on the
top of the tow vehicle housing, which is adjacent to the tow cable and option connectors. The tow cable
attaches to a tow key on the tow arm (see F
IGURE 1-3). Should the user need to reposition the towing arm
forward or aft to adjust the balance of the tow vehicle, additional mounting holes are provided on the
tow point. The towing arm also includes a safety release mechanism, which causes the shear pin to release
the tow key if the tow vehicle hits an obstruction or becomes snagged. Should this happen, the tow vehicle
will rotate nose down, and a safety cable, which is attached from the tow point to the stern of the tow
vehicle, will pull the tow vehicle, stern first, over the obstruction or through the snag. The tow vehicle also
includes two convenient carrying handles.
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