Multiple serial read overrun error.

Hello All,

I am scanning two serial ports (barcode scanners on usb ports with usb to serial converter) simultaneously and creating an array for the different entries as shown in VI

Apart from it I am also scanning Digital inputs (not shown in attached VI, in a while loop).

Sometimes, I get an overrun error, how can I overcome it or what changes should I made in my VI.

I am using LV 2013

Thanks & Regards

JP