Argox PA-20 Portable Data Collectors User Manual - Manual (Page 41)

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8.3 Read Operation Problems
When the terminal has a problem with reading the barcode label
The resolution of the bar code is too high

Decrease the distance between the bar code and the terminal.
The angle between the label and the terminal is too high

Change the angle between the bar code and the terminal.
The distance is too far or too close

Change the distance between the bar code and the terminal.
The bar code is larger than the LED light beam

Try moving the terminal a bit further away from the bar code.
The scanning window is dirty

Clean the scanning window slightly of the terminal (make sure without scratch).
The type of the bar code label is not enabled

Enabled the bar code symbology in the application program.