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Barcode scanner is either a Honeywell N5680 connected via serial, or a CODE CR8200.

https://codecorp.com/products/code-reader-8200/

https://automation.honeywell.com/us/en/products/productivity-solutions/barcode-scan-engines-and-modules/2d-barcode-scan-engines/n5600-series-2d-standard-scan-engine

The barcode scanner is on /dev/ttyS5 and is programmed by default to output just the QR code over serial with no CRLF.