Operator Controls And Indicators; Table 3-8: Towfish Connector Pinout-At Towfish - Klein 3900 Series Operation And Maintenance Manual

2. If connecting a navigation system to the SP-II TPU, connect the supplied
navigation cable pigtail to the NAV connector of the SP-II TPU, and then connect
the pigtail wires to the navigation system's RS-232 serial port as follows:
• Connect the wire labeled "GPS Tx" to "Tx."
• Connect the wire labeled "GPS Rx" to "Rx."
• Connect the wire labeled "GND" to ground.
A Null Modem cable can be used instead to connect to the navigation system
3. Connect the supplied LAN cable to the LAN connector of the SP-II TPU and to
the Ethernet port of the laptop computer.
4. Connect the DC power cord to the 12 VDC connector or the AC power cord to
the 120/240 VAC connector of the SP-II TPU, or connect both power cords.
5. To run the laptop computer from AC power, connect its power supply to the
laptop computer and to the AC power source.
Table 3-8:
Pinout—at Towfish
PIN
3.6

Operator Controls and Indicators

All of operator controls and indicators are located on the connector panel of the
SP-II TPU as shown in Figure 3-1 on page 3-6. They are the following:
PWR:
A/C-D/C:
T/F PWR:
Operator Controls and Indicators
Towfish Connector
FUNCTION
200 VDC Power
1
and Telemetry
2 Shield
Green indicator that is illuminated when either AC
or DC power is on.
3-position switch that when switched to A/C, selects
AC power to power the SP-II TPU, and when
switched to D/C, selects DC power. With the switch
in the center OFF position, power is disconnected.
Blue indicator that is illuminated when 200 VDC is
being applied to the towfish.
3-11