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Comparison of Inductive Modem Module (IMM), Surface Inductive Modem (SIM), and OEM Underwater Inductive Modem
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The table below compares features:

  IMM
(Inductive Modem Module)		 SIM
(Surface Inductive Modem)		 OEM UIM
(Underwater Inductive Modem)  (1)
Deployment History (as of 2010) 4 year 12+ years 10+ years
Maximum Data
Transmission Rate		 1200 baud,
120 bytes/sec		 1200 baud,
100 bytes/sec  (2)		 1200 baud,
100 bytes/sec  (2)
Typical Power Consumption 1 mA at 12V 30 mA at 12V 15 mA at 12V
Physical Size 32 mm x 70 mm 100 mm x 150 mm Varies
Additional Features
  • Includes wake-up tone detect capability
  • Binary data support is standard feature
  • Nonvolatile memory for configuration / data storage
  • Detailed device specification
  • Allows additional wake-up tone detection board
  • Available in direct cable connection (SIM-Direct) and coupled (SIM-Coupled) versions
  • Limited future applications, will slow phase out of production
  • Limited future support
  • New applications not supported
Typical Applications
  • New buoy controller designs
  • OEM underwater instrumentation
  • New moored profiler designs
  • Miniature and low power applications
  • Distributed acoustic arrays
  • Legacy support for existing buoy controller designs
  • Legacy support for existing moored profilers

Notes:
(1) The Underwater Inductive Modem is a component used by OEMs to integrate Sea-Bird's inductive modem technology with a third-party sensor.
(2) The SIM and UIM have a delay between adjacent bytes, resulting in only 100 bytes/second transmission instead of 120 bytes/second.

ADDITIONAL INFORMATION / LINKS:

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

Links to Other Instruments of Interest

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Specifications are subject to change without notice.  

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