NexSens CB-Series data buoys (CB-150, CB-450, CB-650, CB-950, CB-1250 and CB-1450) consist of a buoy hull with internal data well and lid with solar panel assembly. The data well lid is available with the option to be wired with an integrated NexSens iSIC data logger (part number iSIC-CB) or to be provided with pass-through fittings for installation of user-supplied sensors, cables and data logging/telemetry electronics.

NexSens iSIC-CB Data Well Lid

The iSIC-CB is an enclosure with internal iSIC data logger designed for installation in the data well of CB-series data buoys. The standard version of the iSIC-CB includes a series of NexSens UW fittings for connection of solar panels, external power supplies, sensors and communication modules to the iSIC.

The available ports and functions are:

– (5) SENSOR (P0/P1/P2): NexSens sensorBUS architecture includes wiring for SDI-12, RS-232 and RS-485 devices. For compatibility, sensors must have a factory-installed UW plug connector. The sensor ports are wired as follows:

  • (2) P0: 12V full power, shared RS-232 port.
  • (2) P1: 12V switch power, shared RS-232 port.
  • (1) P2: 12V switch power, unique RS-232 port.

– (1) COM: Communications port for iSIC data logger configuration and data acquisition. Communication options include UW-USB-232P-NP cable or RTU-C (cellular), RTU-R (spread spectrum radio) or RTU-I (Iridium satellite) module.

– (1) SOLAR: 6-pin input for solar panel to apply system power and charge internal battery. Solar cable or a specialized UW plug with jumper (P/N UW-JUMPER) must be connected to SOLAR port to power the iSIC.

– (1) VENT: Gortex vent for relief of outgassing pressure during recharge of batteries located in the data well.

The sharing of RS-232 ports on P0 and P1 means that only one non-addressable device can be connected at a time. For example, two devices with RS-232 NMEA0183 output will interfere with each other if both are connected simultaneously to P0. Connecting the devices to different ports (e.g. one in P0, one in P1) will allow both to communicate with the iSIC without interference. Consider the power draw of each device when deciding which port to connect it to. Each device must be programmed to the iSIC through iChart software using the correct port and power settings based on the port assignment.

The SDI-12 and RS-485 ports are shared throughout the bus. SDI-12 devices may be addressed 0-9. RS-485 Modbus devices such as T-Node FR temperature sensors may be addressed 1-250.

Sensors with analog outputs can be connected through mV-RS485 adapters.

Reference the iSIC data logger and iChart software manuals in the Knowledge Base for instructions on configuration of the iSIC.


Figure 1: iSIC-CB Enclosure


Pass-Through Data Well Lid

For applications with user-supplied sensors, data loggers, telemetry modules and/or batteries, CB-series data buoys are provided with a data well lid with a set of plugs and pass-through fittings for securing user-supplied instrument cables. The lid includes the following ports:

– (6) PASS-THROUGH: Blank UW receptacles supplied with a set of plugs for sealing unused ports and a set of fittings for securing instrument cables going into the data well.

– (1) SOLAR: 6-pin port for connection of solar panel assembly provided with CB-series buoy. Includes connector inside data well for use with optional CB-A0X-X battery and solar regulator harness. For use with user-supplied battery/regulator systems, reference the below section on solar power wiring.

– (1) VENT: Gortex vent for relief of outgassing during recharge of internal batteries located in the data well.

Solar Power Wiring

Figure 2 shows a schematic drawing of the wiring of the solar panel assembly to the CB-A0X-X battery & regulator harness.


Figure 2: Wiring Schematic

*Note: The 12V power supply leads for user supplied electronics will only supply power when the solar panel is plugged into the SOLAR port on the data well lid, even if a battery is connected through the Molex connector inside the data well. The solar panel connector contains an internal jumper that connects the power supply leads when plugged in. To supply battery power without plugging in the solar panel, a special UW plug with internal jumper is available (order part number UW-Jumper).

For systems where the battery and solar regulator are user-supplied instead of using a CB-A0X-X assembly, the battery and regulator can be connected through the 4-pin Molex connector or by cutting the wires at section A-A and splicing connections. In these situations, reference the signals listed in Table 1 below.

Table 1: Wiring for user-supplied battery/regulator


Wire Color





Solar input


Charge output


REV 15B17

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