Chapter 1: System Overview, Rev. 1.1
1.1.5.3 NMEA Input Modules
The NMEA Input Modules capture data items in IEC 61162 (NMEA 0183) and limited ASCII data
formats. NMEA modules accept up to 8 NMEA-0183 data streams from shipboard systems and
multiplexes them for simultaneous output to an Ethernet connection and a single RS-232/422
serial data channel. Captured data is sent to the DMM via an Ethernet connection for storage and
retrieval. The NMEA module also features:
8 available inputs with each module.
Capability to daisy-chain (cascade) optional modules.
Output to bridge alarm systems for data in IEC 61162 (NMEA 0183) format.
Output to bridge alarm systems for direct connection of Automatic Identification System
(AIS).
Output to bridge alarm systems from additional cascading (DC) or Rutter interface data
outputs.
(See Chapter 10 for full NMEA Module details.)
1.1.6 Operation & Alarm Unit
The Operation & Alarm Unit (OAU) provides a visible and audible alarm to alert the ship’s officer
on watch of any detected failure within the VDR-100G3. The alarm unit is also used to initiate a
download operation on the VDR-100G3. This allows a user to:
Save recorded data. The user should save and secure this recorded data within 12 hours
of any incident to prevent the recording from being overwritten;
Disconnect the optional Remote storage Module (RSM) and download USB drive;
Copy secured, archived, or current data to the download USB drive.
(See Chapter 11 for full OAU details.)
The OAU is integrated into the Data Processing Unit of the VDR-100G3, but
a
remotely mounted
OAU module is also available as an option. It is preferable
that the optional remotely mounted OAU be specified when the VDR-100G3 is
ordered but it can be field mounted.
1.1.7 Final Recording Medium (FRM/SFRM)
The Final Recording Medium (FRM/SFRM) is a solid-state storage unit capable of storing 12
hours of VDR-100G3 data in compliance with IMO resolution A.861(20). It can be either a fixed or
float-free capsule.
Additional information:
The primary function of the FRM/SFRM is to provide a protective capsule for the IMO-
required data recorded by the VDR. In the event of an incident, this data can be used by
the accident investigation team.
The FRM/SFRM is mounted on the exterior deck of the ship and connected to the DMM.
The FRM/SFRM receives data from the VDR via an Ethernet link.
1.1.7.1 Fixed Capsule
Fixed capsules are designed to ensure that critical voyage data can survive the following
environmental conditions:
Impact shock: 50 half sine-wave pulse for 11 milliseconds (NOTE: The Fixed SFRM
capsules do not meet this specification.);
Penetration: 250 kg mass dropped 3 metres impacting with 100 mm diameter pin;
Fire Exposure: 1,100 degrees centigrade for one hour and 26 degrees centigrade for 10
hours;
Deep Sea Pressure: 30 days under water at MPa (equivalent to 6,000 m depth).
(See Chapter 12 for full FRM/SFRM details.)
VDR-100G3/G3S Installation Manual 08/10/2008
1-6
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