Teledyne LeCroy SENT Decoder - Manual (Page 8)

SENT Decoder
6 922664 Rev A
Fast Channel Dialog
Within the Basic dialog, the Fast Channel tab will appear if you select Decode Type “Words” and
Channels is set to either “Fast” or “Both.”
Within the Fast Channel dialog, this SENT decoder has four user defined data fields, D0 through D3. Each
of these can be used to present the content of the message payload as it was programmed. Start by
selecting the payload offset, then specifying where in the data field and how many nibbles are included.
For each of the four data bits (D0-D3) that are in use, specify the payload interpretation.
Active - check to activate the display showing payload content.
Offset - Defines where in the payload you start including content.
Nibbles – Number of nibbles included in the displayed value.
Order – data can be presented in least-significant bit or most-significant bit order.
Slow Channel Dialog
Within the Basic dialog, the Slow Channel tab will appear if you select Decode Type “Words” and
Channels is set to either “Slow Only” or “Both.” The Slow Only option takes a single data value from
each of 16 or 18 SENT message packets and build a resulting Slow Channel result, displayed within the
decoded table.
A Slow Channel Definition File (SCDF) is used to decode this data into a more meaningful presentation of
the assimilated slow channel data. Within the Slow Channel dialog controls, use the navigation controls
to select the user defined text table file for this purpose.
To download the data file, connect a USB drive one of the oscilloscope host USB ports and navigate to
the directory. We recommend that you build your library of these text files at this location:
C:\LeCroy\XStream\Applications\SENT
Levels Dialog
The Levels dialog controls the levels used for determining the edge crossings of the SENT signal. The
default settings of Percent level = 25% and Hysteresis = 0.5 divisions are usually appropriate for most
signals.
Level Type - whether Level will be given as Percentage of amplitude or Absolute number of vertical
divisions.
Level - percentage of amplitude or absolute voltage at which the crossing occurs.
Hysteresis Type - whether Hysteresis will be given as Percentage or absolute number of vertical
Divisions.
Hysteresis - margin of error; amount signal may rise or fall without affecting bit transition.