This data logger records up to 2 data streams onto a USB stick. This may be two NMEA0183 feeds, or with the Seatalk converter one NMEA0183 and one Seatalk. Seatalk messages are encapsulated within a NMEA sentence. Power is 12/24V DC. The two data streams are multiplexed into a single file of NMEA0183 data, and data is recorded as soon as the device is switched on.
The logger is available for purchase (we no longer have funding to supply them on free loan).
Although initially designed explicitly for TeamSurv, it is also being used in many other applications where it is necessary to record NMEA0183 data, for example:
The device is not waterproof, so install in a dry location. Allow 90mm clearance at the USB end, to allow USB sticks to be inserted and to give access to the On/Off button. Secure in place with 4 M3.5 or M5 countersunk machine screws, 3M Dual Lock or similar.
Connect 12/24V DC power. There is an internal self-resetting fuse, so no inline fuse is required. Power is typically taken from the same circuit as the instruments, and can be taken from the Seatalk bus if the Seatalk option is used. Connect the NMEA and/or Seatalk data wires, insert a USB memory stick, and check the LEDs to ensure correct operation.
For connection instructions for specific instruments, refer to the NMEA0183 Installation Guides.
On power up, a new log file is created on the USB stick, and data is written as it arrives, multiplexing the two data streams into the one file. NMEA sentences are not tagged to show which port they came in on, nor are they time stamped.Seatalk sentences are embedded within a proprietary NMEA sentence, e.g. $PTSV,SEATALK,0105FA0300300703*8A is output for the Seatalk packet 0105FA0300300703.
To remove the USB stick, either power off, or press the button by the USB stick to ensure data is correctly written - failure to do this may corrupt all data on the USB stick.
The Restriction of Hazardous Substances in Electrical and Electronic Equipment (RoHS) Directive was passed into law by the European Union (E.U.). It affects manufacturers, sellers, distributors and recyclers of electrical and electronic equipment containing lead, cadmium, mercury, hexavalent chrome, polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE).
All of our products and packaging materials are fully RoHS-compliant.
The Seatalk option is a plug-in module that replaces one of the NMEA0183 inputs with a Seatalk one, converting the Seatalk electrical signal to an RS422 one. The firmware in the data logger then wraps the Seatalk datagram into a NMEA sentence in the form $PTSV,SEATALK,datagram,*cc, where "datagram" is the Seatalk data, and "cc" is the standard NMEA checksum.
The Seatalk protocol has been reverse engineered by Thomas Knauf, who has published the Seatalk specification online.