Underwater Inductive Modem Module
UIMM

Print version     Configuration options & accessories

The Underwater Inductive Modem Module (UIMM) provides a quick way for system integrators and instrument/sensor manufacturers to adapt new or pre-existing RS-232 instruments, such as acoustic current meters, Doppler profilers, optical sensors, etc., for integration with real-time moorings using Sea-Bird’s Inductive Modem (IM) telemetry. (See Real-Time Oceanography with Inductive Moorings for detailed system description.)

The UIMM is simply an Inductive Modem Module (IMM) housed in a pressure case and incorporating an integral inductive coupler and cable clamp. It is designed to be cable-connected to an RS-232 serial device such as a current meter, and then clamped to the jacketed mooring wire. The UIMM can also be used as a substitute for an IMM (housed inside a buoy) and an Inductive Cable Coupler (ICC). For this case, the UIMM receives inductive communications from other underwater IM devices and sends the data via RS-232 to the surface buoy (or bottom junction in a cabled observatory).

The IMM can be user-configured via RS-232 to send and receive commands necessary to control the serial instrument and receive or retrieve data. The UIMM communicates with an RS-232 instrument and requires a small amount of power from it via a 4-pin connector (UIMM does not have an internal power supply).

UIMM SPECIFICATIONS

Sensor interface: RS-232

Sensor baud rate: 300, 600, 1200, 2400, 4800, 9600, or 19200 (IM telemetry rate 1200 baud)

Memory for sensor data: 16 KByte (40 stored samples maximum)

External power required: 6 - 30 VDC
     Quiescent current: 300 microWatt *
     Operating current: 15 milliWatt *
     * Power draw higher for input voltages>19 VDC; consult factory.

Materials: Titanium (7000 meter) or Plastic (350 meter) housing

ADDITIONAL INFORMATION / LINKS:

Documentation -- manual, photos, technical papers, application notes, etc.

• Inductive Modem background information:
  - Real-Time Oceanography with Inductive Moorings -- technical paper.
  - Typical IM Mooring Components
• Print version of this specification sheet / brochure
• Application Notes:
  - 85: Handling of Ferrite Core on Instruments with Inductive Modem Telemetry

Sales Information -- options, accessories, cables, mount kits, spares, etc.

• Configuration options & accessories:
  - Details for UIMM
  - Listing for all products

Links to Other Instruments of Interest

• Other Inductive Modem instruments and accessories:
  - SBE 16plus-IM V2 SEACAT C-T (pressure optional) Recorder -- can acquire data from auxiliary sensors
  - SBE 37-IM MicroCAT C-T (pressure optional) Recorder
  - SBE 37-IMP MicroCAT C-T (pressure optional) Recorder -- integral pump
  - SBE 37-IMP-IDO MicroCAT C-T-DO (pressure optional) Recorder -- integral pump, integrated dissolved oxygen sensor
  - SBE 39-IM Temperature (pressure optional) Recorder
  - SBE 44 Underwater Inductive Modem -- alternative to UIMM, for applications where internal power is required
  - Surface Inductive Modem (SIM) -- surface buoy link in inductive modem system
  - Inductive Modem Module (IMM) -- surface buoy link in IM system; more flexibility than SIM
  - Inductive Cable Coupler (ICC) -- for connection to SIM or IMM

Specifications are subject to change without notice. 

Last modified:19-Nov-2010

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