Setting up RFID system

[jp978]

Hi all,

My situation currently is setting up proper communication between the Arduino and a UHF reader/ writer.

I am using

-Arduino Mega 2560

-Arduino compatible Compiler for LabVIEW

-Reader “CF-RU5106”

-Shield for Serial communication “RS232”

Tested the Arduino Compiler for LabVIEW and it works. I set up serial settings, and now starting to create serial instances for data flow. One mistake I made is that I totally forgot to take into consideration of the CRC-16. I tried setting up CRC computation code provided by the manufacturer using Formula Node in LabVIEW but was unsuccessful.

Any feedback or suggestions is much appreciated.

[Letitsnow]

Hi jp978,

I think the following links should prove to be helpful in your application:

CRC16 Checksum:

https://forums.ni.com/t5/Example-Code/CRC16-checksum/ta-p/3996191

Tutorial: Formula Nodes:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000x30HCAQ&l=en-US

In order to receive the most sufficient help, I would also recommend posting your code.

[jp978]

Thanks

I came across various CRC LabVIEW examples and found two that seem to fit my application requirements. I am currently changing my code, and I will post it as soon as it looks decent enough to read.

[jp978]

This is what my code is looking like. So far I dont quite understand the CRC portion, but most of it consist of formulating the command for the reader.

Any feedback will help.

[Letitsnow]

Hi jp978,

Here are some links that should prove to be useful for developing a CRC code:

Inline CRC Reference Library:

https://forums.ni.com/t5/Example-Code/Inline-CRC-Reference-Library-CRC-32-CRC-16-and-CRC-8/ta-p/3500...

CRC16 Checksum:

https://forums.ni.com/t5/Example-Code/CRC16-checksum/ta-p/3996191

CRC -16 Reference Calculator:

https://forums.ni.com/t5/Example-Code/CRC-16-Calculator/ta-p/3996194

CRC CCIT 16bits:

https://forums.ni.com/t5/Example-Code/CRC-CCITT-16bits/ta-p/3996269

CRC codes are something that we do not necessarily specialize in developing. I would recommend developing a CRC code based on a predeveloped algorithm as shown in some of these examples.

I hope this helps!

[RTSLVU]

Here is a CRC-16.vi that I got from the LabVIEW Code Exchange a few years ago when I had to deal with them.

[jp978]

I will look at the links. Thank you. 

[jp978]

Thanks for the sample. I will test it with my code.

[jp978]

I managed to get a value for the CRC code. I verified with some example code from the arduino forums and also some online CRC calculators. I managed to create a serial command using VISA, i will post the code below.

The problem currently is either setting the command and not receiving a string from the reader. Any suggestions will help.

RedoProj is the main code.

[Letitsnow]

Hi jp978,

If you wouldn't mind elaborating on the error you are seeing I think that would help in this case. I am a bit unclear on the scope of the problem. Specifically, what error are you seeing when the string does not come through to the reader? Also, what is your expected output?