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July 2019 – TD 304 OPERATING MANUAL – Doppler Current Profiler Sensor
The available sub commands
available values on the enumerated properties are also shown here. Some of the enumerations will change depending
on configuration (Polled Pingrate property and Interval property).
The three columns have almost the same available settings. The difference between the three is that column 1 can have
up to 75 cells, column 2 up to 50 cells and column 3 up to 25 cells (150 cells totally).
The user is allowed to set up columns which are way too long, the sensor is able to sample approximately 115m, the
acoustic range is in most cases much shorter than this (The practical acoustic range varies between 30 and 70m in
broadband mode and 35 to 80m in narrowband mode depending on the backscatter conditions). Setting a way too long
column does not give an error message. If for example the cell size is 5.0m, number of cells 50 and cell spacing 5m this
only gives valid data up to cell 23. The Cell Status parameter on all the rest of the cells will indicate that these are out of
range.
Example 2: Setting orientation and measurement properties
//Press Enter to start communicating with the sensor, refer chapter
//press Enter
↵
Stop
//Wait for ack #. Repeat if necessary
↵
Set Passkey(1)
Set Enable Upside Down(Yes)
Set Enable Surface Cell(No)
Set C1 Enable Surface Reference(No)
Set C2 Enable Surface Reference(No)
Set C3 Enable Surface Reference(No)
Set Enable Tilt Compensation(Yes)
Set Enable Fixed Heading(No)
Set Bandwidth(Broadband)
Set Enable Ambiguity Lock(Yes)
Set Ping Number(20)
Set Enable Burst Mode(No)
Set Burst Period Placement(End Of Interval)
Do Refresh()
↵
//Bandwidth changed, necessary to do this
Set Interval(2 min)
Save
↵
// wait for ack #
Reset
↵
// the sensor will restart with new settings
Comments to example 2:
When the user wants to use the sensor downwards, the Upside Down should be enabled. The sensor is able to sense
the orientation itself and it uses the measured orientation when calculating north and east speed components and the
correct heading and pitch/roll.
The user is allowed to enable upside down, surface cell and surface reference even if this does not work.
If the sensor is upside down while the surface cell is enabled, the surface cell parameter's status is set to not valid error
and the values are zero. If surface referred is enabled, the column is forced to be sensor referred.
If the tilt compensation is disabled, the sensor uses zero tilt for all calculations. The tilt compensation should normally be
enabled (default setting from factory). The fixed heading is normally disabled. The fixed heading can be used when the
sensor is in a fixed position, for example on a location where the magnetic field is disturbed by something nearby.
(Do
Sample,
Do
Output,
↵
//wait for ack #
↵
//if it was enabled, has to be disabled with upside down enabled
↵
↵
↵
↵
//wait for ack #
↵
//wait for ack #
↵
↵
//wait for ack #
//wait for ack #
↵
↵
//wait for ack #
↵
//wait for ack #
↵
//The present interval can be too short, always wise to try to set again (error if too short)
Do Refresh
and
Do Calc
5.4
//same as for surface cell
//same as for surface cell if column 2 is enabled
//same as for surface cell if column 3 is enabled
↵
//wait for ack #
MinTime) are listed next. All
Page 109
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