RBR inductive mooring line modem

Inductive mooring line modem

Supporting as many instruments as required and operating at the baudrate of 4800 over an insulated mooring line of more than 4km length, the RBR inductive mooring line modem can meet any challenge. It is a simple, strong, fast, and flexible solution to bring your data to the surface.

  • Easy system integration
  • Low power consumption
  • Fast data transmission
  • Flexible configuration
  • Robust and reliable
  • RS-232 output

RBR ssm inductive mooring line modem
The inductive mooring line modem consists of the head-end modem (HEM) and one or more sub-surface modems (SSM). Each instrument on the mooring line system is connected to an SSM, which communicates inductively with the HEM through the mooring cable.

The main features of the inductive mooring line modem are a fast communication rate along the mooring line, shock protected ferrites, no pre-deployment configuration required, an automated instrument discovery mechanism, and an intelligent addressing mechanism that conserves power. A comprehensive set of system commands is available to query or command the instruments to identify themselves, take a sample, and transmit data. Instruments may be addressed individually, in sub-groups,or all at once.

The SSM is available as an integral option for RBR instruments, attached as the battery end-cap via a coupler. Alternatively, use it as a standalone cabled version for serial connection to an RBR instrument in combination with the RBRfermata battery canister, or to a third-party instrument, such as ADCP.
Inductive link
Baudrate 4800baud
Mooring line Ø5 − 15mm
HEM (head-end modem)
Serial communication Up to 115000baud
 Polling mode  Scheduled or interactive
 Addressing mode  Individual, group, or all
Voltage 9.5V to 22V
Power consumption 40μA sleep, ≤5mA active @ 12V
Temperature range -30°C to 60°C
Clock accuracy ±60 seconds/year
Housing Weatherproof
Dimensions 225mm x 125mm x 85mm
SSM (sub-surface modem)
Serial communication 4800 to 19200baud
          On battery
8V to 22V
2V to 8V
Power consumption
          On battery
40μA sleep, ≤3mA active @12V
120μA sleep, ≤5mA active @7V
Temperature range -10°C to 50°C
Housing Plastic or Ti
310mm x Ø63.3mm
328mm x Ø60.3mm

Depth rating