The default label length is 5 characters. Labels are zero-filled or blank-filled to this length.
If all the labels in your project are all the same length, you can use this global parameter to set the label length and eliminate zero and blank filling of labels. To configure a new label length for your project, add the following line to your global parameters file:
where <label_length> is 3, 4 or 5. If a label is read that has a length greater than this, a FAILURE error message will be logged to the Status Log.
Advanced configuration requirements.