LIN decoder

The LIN decoder I/O decodes analog data on a Local Interconnect Network bus to LIN message data. The LIN decoder has auto level detection and auto baud rate detection. The output of the LIN decoder I/O can be shown in a Table sink or passed on a to a Value extractor I/O.

The following fields are extracted from the LIN communication and shown as a column in the table:

Field name	Purpose	Default shown
PID (Hex)	Protected IDentifier in hexadecimal notation
PID (Dec)	Protected IDentifier in decimal notation
FID (Hex)	Frame IDentifier in hexadecimal notation
FID (Dec)	Frame IDentifier in decimal notation
Data (Hex)	The data in hexadecimal notation
Data (Dec)	The data in decimal notation
Data (ASCII)	The data in ASCII notation
Checksum (Hex)	The checksum in hexadecimal notation
Checksum (Dec)	The checksum in decimal notation
PID parity valid	Indicating the PID parity is valid
Checksum valid V1	Indicating the checksum is valid according version 1 determination
Checksum valid V2	Indicating the checksum is valid according version 2 determination
Valid	Indicating the LIN message is valid
Flags	Flags regarding the LIN message

To show or hide specific columns from the table, use the Select columns () button in the Table sink.

Double clicking a row in the table will zoom the active graph in to the time frame corresponding to the table row.

The Value extractor I/O can be used to extract a specific value from the decoded data and present that in a graph, a meter or a table.

Measurement on a LIN bus, with data decoded by a LIN decoder.

LIN decoder properties

To control the behavior of the LIN decoder I/O, several properties and actions are available. These can be accessed through a popup menu which is shown when the I/O is right clicked in the Object screen. The properties can also be accessed through its settings window which is shown when the I/O is double clicked in the Object screen. To open the Object screen, click the Show object screen button.

LIN decoder control

By default, the settings window only shows the most used settings. When Advanced is ticked, the extended window with all settings is shown. See also the program settings.

Level

In order to decode the analog signal into a digital signal, the LIN decoder I/O compares the analog input signal with a mid level: anything above that level is considered "high" and anything below that level is considered "low".

Hysteresis

To minimize the effect of noise on the signal when comparing the signal to the level, a Hysteresis can be used around that level. Anything above "level + hysteresis/2" is considered "high" and anything below "level - hysteresis/2" is considered "low".

Auto detect level and hysteresis

Enabling Auto detect level and hysteresis will let the software determine a suitable mid level and hysteresis, based on the measured signal. Each time new data is available, the suitable level and hysteresis will be determined again. In streaming mode, level and hysteresis are determined once based on the first chunk of data and remain at these values though out the whole measurement.

Auto detect level and hysteresis is default enabled.

Invert

For correct detection, the Invert property must be set to the correct value, corresponding to the bus that is under measurement.

When Invert is disabled levels above signal mid level are logic 0, levels below signal mid level are logic 1
When Invert is enabled levels above signal mid level are logic 1, levels below signal mid level are logic 0

Invert is default off.

Baud rate

For correct detection, the Baud rate property must be set to the correct value corresponding to the bus that is under measurement. It can be set to several common standard values, but it is also possible to enter an arbitrary value in the Baud rate edit field.

Auto detect baud rate

Enabling Auto detect baud rate will let the software determine the correct baud rate, based on the measured signal. Each time new data is available, the baud rate will be determined again. Auto detect baud rate is default enabled.