SENT Reference API

[Christian_L]

Please post any comments, questions or feedback on the SENT Reference API in this thread.

SENT References:

NI Community: https://forums.ni.com/t5/Example-Code/SENT-Communication-Protocol-Reference-Example-in-LabVIEW-FPGA/...

Wikipedia: http://en.wikipedia.org/wiki/SENT_(protocol)

SAE Standard: http://standards.sae.org/j2716_201001/

Digi-Key article: http://www.digikey.com/en/articles/techzone/2011/may/digital-communication-for-smart-modern-sensors

[d.marchei]

Hi,

I am using the following driver to read data from a sensor by SENT.

https://forums.ni.com/t5/Example-Code/SENT-Communication-Protocol-Reference-Example-in-LabVIEW-FPGA/...

I am able to read information but I have a problem with the CRC. The check is 90% wrong, even if the information is always right. Do I need to change something inside the CRC VI?

I have tried to use this library too (https://www.ni.com/en/support/downloads/tools-network/download.sent-driver-api.html), but I couldn't find the CRC.

Thanks!

Davide

[PPCCompany]

Please post any comments, questions or feedback on the SENT Reference API in this thread.

SENT References:

NI Community: https://forums.ni.com/t5/Example-Code/SENT-Communication-Protocol-Reference-Example-in-LabVIEW-FPGA/...

Wikipedia SEO: http://en.wikipedia.org/wiki/SENT_(protocol)

SAE Standard: http://standards.sae.org/j2716_201001/

Digi-Key article: http://www.digikey.com/en/articles/techzone/2011/may/digital-communication-for-smart-modern-sensors

[Kalin_T]

Hi Christian, 

Can the SENT Driver API be used with the R series PXI FPGA cards? Looks like a total of 2 digital channels are needed - 1 to receive, and 1 to send. Thanks. 

--KT

[Christian_L]

The SENT communication example provided in https://forums.ni.com/t5/Example-Code/SENT-Communication-Protocol-Reference-Example-in-LabVIEW-FPGA/... can be used with R series devices.

The SENT Driver API on the LabVIEW Tools Network (https://www.ni.com/en/support/downloads/tools-network/download.sent-driver-api.html) is a different set of code, and I'm not very familiar with it. But after taking a look at it, I don't see why it wouldn't work with the R series as well.

[aisiw_schaeffler]

The CRC sub-vi does not seem to calculate the correct CRC value according to the SAE 2010 SENT protocol.

[Christian_L]

By chance, would you have access to the CRC definition for the SENT protocol, that you could share with me, so that I can verify and correct the implementation?

[aisiw_schaeffler]

Sure, Christian:

Here are the taken from SAE_J2716_Jan2010:

It seems that the original vi used different CRC implementation.

[Christian_L]

Here is a LabVIEW implementation of the SAE 2010 SENT CRC code using the 5.4.2.2.2 16-element array implementation. I will include this in the example code next week, but wanted to share it with you so that you can use it before I have the chance to update the code. The default value for Initial CRC Value is 5 (binary 0101).This code tests successfully for all of the test cases in Table B.1-2.

[Friesenmartin]

Hi Christian,

I ´d like to use your API with the NI-9401 to test our sensors. Do you tests the API until 1us TickTimes of sensors?

In our tests we must check a amount of about 30 sensors. Is it possible with e.g. 4 modules of the NI 9401?

Do you have some VIs to build the slow message from the fast message?

Best regards Martin