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POS systems contain an empty hardware shell with nothing running thereon. Likewise, an all-in-one printer wouldn't scan, fax, or print without software driving features. A similar principle should apply to an all-in-one POS system. While one could argue that the merchant should choose what software they need to run, if we use our defined criteria, then an all-in-one POS system should aim to eliminate additional headaches. Choosing POS software, which will be 100% compatible, then having to put in it, presents severe trouble. If you would like an entire system, this is often definitely a requirement.
Interfaces - an all-in-one POS should provide the newest interfaces to support devices that aren't integrated like scales, PCs, or scanners. Especially crucial for future expansion are LAN interfaces, which permit multiple POS systems to stay connected and share data in real-time. Networking opens options for device sharing, office PCs, processing, and remote support also. At the very least, an all-in-one POS system should include USB, RS232, and LAN interfaces.
For more: https://sygnio.com/