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 Application Note 92: Real-Time Oceanography with Inductive Moorings and the Inductive Modem Module (IMM) 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:
  - Typical IM Mooring Components
• Print version of this specification sheet / brochure
• Application Notes:
  - 85: Handling of Ferrite Core on Instruments with Inductive Modem Telemetry
  - 92: Real-Time Oceanography with Inductive Moorings and the Inductive Modem Module (IMM) -- Technical paper provides background information on inductive modems, principles of inductive coupling, mooring configurations, use in fresh water, system components, mooring cable and cable fitting resources, and OEM components available from Sea-Bird

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 (membrane-type sensor)
  - SBE 37-IMP-ODO MicroCAT C-T-DO (pressure optional) Recorder -- integral pump & integrated Optical Dissolved Oxygen
  - 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. 

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