Barcode - How to output an underscore when scanning

Hi,
I am currently working with a Zebra Label that outputs some text, variables and a barcode.
We are using code39 for the barcode.
How do you output an underscore when scanning the barcode?
Does code39 support outputting an underscore? If not, what barcode style does support it?
Thanks,
John

The CLK of the FPGA is 200MHz and the Sampling frequency of the ADC is 50 MHz, so I set the FFT IPCore CLK to 50 MHz.
This is a little confusing. So is your FFT's clock pin actually running at 200 or 50? The FFT has 2 parameters: Target clock frequency and target data throughput. It sounds like you should be setting the former to 200MHz and the latter to 50MHz.
I'm guessing your output buffer is overflowing because the FFT is outputting new rames way faster than you'd read them through UART. Thus your address is rolling over a bunch of times between uart reads and the data is getting totally corrupted. You should probably drop down chipscope to see for sure, thought.
Another thing you could try is use a SR register on your buffer write enable to only capture the first output frame from the FFT.

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I find it interesting that the issue happens across both printers. This is what leads me to believe this is something with the software/connection with the PC. One thing I will note is that you mentioned above using Adobe Reader 10.1.6. The latest version of Adobe Reader is 11.0.02. I would advise removing your current version of Adobe Reader and install the latest version.
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You are getting such output because you have checked ON the setting 'Print to file' in one of your previous prints. For resolving this issue, kindly uncheck option 'Print to file' present in bottom left corner of print dialog and then click on 'Print' (See attached image for reference).
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