3-7
CM Red indicator Flashes at 1 HZ is an undercurrent condition exist and 2
(Current Monitor) HZ if an over current condition exist between the topside and tow fish.
If flashing, check the tow cable for shorts or for non-continuity on pins
1 and 2.
3.6 Topside Processor Connections
The connections for the two topside options are described in the following sub-sections.
3.6.1 4125-P Portable Topside Processor Connections
The 4125-P Portable Topside Processor connections are made using connectors on the side panel as
shown in FIGURE 3-1. The 4125-P Portable Topside Processor connections are the following:
TOWCABLE: 6-pin female bulkhead connector. Connects to the tow cable.
DATA: ETHERNET LAN connector. Connects user-supplied PC running
DISCOVER 4125 software to the 4125-RM topside.
DC INPUT: 4-pin male bulkhead connector. Connects to 12–24 VDC power.
AC INPUT: 3-pin male bulkhead connector. Connects to 90–260 VAC, 50/60 Hz
power.
POWER: Toggle switch that turns the topside on and off. Can be left in the ON
(Switch) position all the time, and then the front POWER switch can be used.
3.6.2 4125 Rack Mount Topside Processor Connections
The 4125-RM Topside connections are made using connectors on the side panel as shown in FIGURE 3-3.
The 4125-RM Topside connections are the following:
SEA CABLE: 6-pin female bulkhead connector. Connects to the tow cable.
ETHERNET: Standard RJ45 bulkhead connector.
3.7 TCP/IP Address Settings
The 4125 Series Dual-frequency Side Scan Sonar System includes a number of ETHERNET devices
connected on a common local area network (LAN), and each of these devices has a factory set TCP/IP
address which under normal circumstances does not require changing.
However, should any of these devices be replaced, or if upgrades are later installed, it may be required
that the TCP/IP addresses be reconfigured. In addition, any computer that is to be connected to the 4125-
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