Topside System Connections
3-5
2.
Grasp the body of each connector at the towfish and gently pull them apart.
Do not pull on the cables to separate the connectors. Always hold the body of
the connectors. After separating the connectors, put a thin coating of silicone
grease on the rubber section of the connector pins.
3.
Disengage the shackle from the tow bracket.
4.
Install a dummy plug into each of the exposed connectors.
3.5
Topside System Connections
All of the topside system components connect together using the supplied cables.
User supplied cables are required for connecting to a GPS and to other equipment.
3.5.1 SP-III TPU Connections
All the connections to the SP-III TPU are made to connectors on the side panel
which is shown in Figure 3-1.
The SP-III TPU connectors are the following:
TOWFISH:
8-pin female bulkhead connector that connects to
the towfish using the tow cable.
LAN:
RJ-45 connector that connects to the Ethernet port of
the laptop computer. The SP-III TPU uses a
100BaseTx Ethernet connection.
T/F TRIG:
BNC connector that connects to an external sonar
system and is used to trigger the sonar of that system
at the start of each ping cycle. Provides a TTL
compatible, 1-msec wide output pulse.
RESP TRIG:
BNC connector that connects to an ultra short
baseline navigation system (USBL). Provides a TTL
compatible, 1-msec wide output pulse with each
trigger of the optional responder.
EXT TRIG IN:
Not supported for this system.
1PPS:
BNC connector that connects to a GPS and is used
to input 1PPS (one pulse per second) signals.
MAG:
DB9 female connector that connects to a serial port
of the magnetometer control computer. The baud
rate is 9600.
DEBUG:
DB9 female connector that connects to a serial port
of a computer and is available for factory use and
troubleshooting purposes. The baud rate is 115200.
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