I understand that this is necrophilia, but if someone could look into this issue :)
First, there is the single complexes of the system unit, fiscal recorder (FR), monitor, and maybe something else, assembled in one housing or in common modules. Put on the account in tax in one piece. And there are a hodgepodge of anything on the account is only one FR. Then again, the division is often very conditional...
The main types of peripherals and interfaces used in point of sale (automated work place of cashier):
- programmable keyboard interface PS/2 and USB-HID;
- readers of magnetic and contactless cards;
- the barcode scanners: led (reliability axe, but the reading distance is hardly a couple of centimeters), laser (for precision mechanics average force attack can be fatal — slips adjusting mirrors, reading range... well, 10-15 cm it is possible to), interfaces PS/2, COM, USB-HID, USB-COM (the latter two both wired and wireless — Wi-Fi, Bluetooth);
- various thermal and dot-matrix printers, refer here FR, interfaces, LPT, COM, USB, USB-VCOM, Bluetooth, Wi-Fi, Ethernet
- customer displays, LCD and VFD, the last more popular, COM interfaces, USB VCOM
Equipment manufacturers a lot, but the highlights Posiflex, producing all the way down to calls to the kitchen.
Ukrainian POSUA makes very nice keyboards, and card readers.
ChipherLab, Metroligic, Honeywell make good scanners SHK.
Some protocols are standardized, in particular OPOS, JPOS. Other protocols already established for years as the unofficial standards.