PDF417 with more info than desired

Hi, I am scanning a PDF license driver with a huge amount of information ( + 500 chars) some of them are special representation of the fingerprint and they keep the computer freeze while reading all those special chars, I am using a DS4308.

The questions :

1) Can I force the barcode reader to avoid those RARE characters ?

2) Can I limit the amount of chars the I read each time to ej : 200