Symbol LS4278 Scanner 4 Beep Error Code
The scanner is a Symbol LS4278. It beeps 4 times when scanning a barcode which indicates a communication error with the computer. This link contains a document that can be printed to reconfigure it.
https://portal.motorolasolutions.com/Support/US-EN/Resolution?solutionId=6701&redirectForm=search&searchQuery=%3FsearchType%3Dsimple%26searchTerm%3DLS4278%204%20beeps