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Are you getting the truncation when selecting the browse tool as well or in the output? If you are just viewing the results from the input tool then you will get a truncation when it's more than 255 characters. Check it at the browse tool (or further downstream) to see if you're getting the same truncation.
Is the truncation in the data itself or just in the results pane? @chukleswk's point is valid that the results pane will truncate for presentation purposes only. If you put a browse after the select how does it look?