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Q: 

How to know when a Magnetic Card Reader is done.

2-Part question because I think I may know the answer to the first part:

The existing solution was to set a timer on a form and read track by track for a few seconds. That doesn't seem too robust.

My idea is to parse the card data and that way I'll know when I'm done.

Unfortunately I just realized while writing this that I don't know how many tracks I'm going to be reading in so I can't really do that.

I was wondering, however, if there was a standard way that magnetic card readers alert you that they're at the end of their lines and have no more lines. I could check one or two of my test readers, but I don't know if it's standard.

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