Recording Via The Trigger Connector; Recording To The 73Fiftyblackbox - NETmc Marine 73fifty Series User Manual

Hide thumbs Also See for 73fifty Series:

Table of Contents

If this is not done, the disk space will eventually become full, at which point further recording will not

be possible, and an alternating message will appear on your screen.

"Recorder was stopped" and

"No Room left on disk"

It will then be necessary to upload and delete some files from the 73fifty before you can record

more files.

The date and time shown are those when recording was stopped.

Accidental switch-off: Note that as a safety measure to prevent accidental loss of data, if the power

switch of the 73fifty is pressed during recording, recording will not actually stop. The unit will not

switch off until "Stop" is pressed and the unit has ensured that the file has been saved correctly.

Recording via the trigger connector

Recording to the 73fifty or 73fiftyBlackbox can also be triggered by an external connection – for

example to a record switch on the control desk, an off-deck microswitch for the ROV / dive bell, or a

trigger from the main system switchboard. When 12v is applied across the trigger input (NOT

polarity sensitive) the recorder will start recording. When the 12v is removed, the recorder will stop

recording.

Once recording is activated by the trigger, it can only be stopped via the external trigger – i.e. the

front panel controls are disabled.

Recording to the 73fiftyBlackbox is automatically set to be in time-restricted mode, 5 minute

segments. (See the Menu section on recording mode for more information.)

An example of the display screen during recording to the Blackbox is as follows:

The first line of display indicates that the unit is currently recording. The BL indicates that it is a

Blackbox and is recording at low bitrate. The line of digits shows the current file name (the date

and time the current recording segment began.)

The second line of display shows that 12.5 seconds have lapsed since recording to this file name

began.

Once the disk space has been filled, the unit begins loop-recording. Every 300 seconds the oldest

file(s) is removed to make space for the newly-recorded file. The messages "creating file" will

appear on the screen and the record button will flash rapidly.

NETmc Marine 73fifty Manual Rev 5.8 July 2011

19 of 38

Table of Contents