Home » RFID and Barcode Glossary » Guard Bars Guard Bars What are Guard Bars? The bars that are at both ends and center of a UPC and EAN barcode type. They provide reference points for reading, serving a function similar to start/stop codes. Related Barcode Terms 1D Barcodes 2D Barcodes Aztec Code Barcode Barcode Reader QR Code PDF 417 UPC
