You would never want your point of sale system to be down because you ran out of paper. Receipt and remote printers are the parts of your point of sale system most prone to failure. They get the most use and have the most wear and tear of any part of your system. This is also true for cheap printers for sale. By using the parallel interface for the receipt printer you then open up the serial and USB ports for other devices. According to one study, the printer ink cartridge business is responsible for $21 billion (US) per year in sales.
Sometimes, this loaner program is in the form of a maintenance plan. Which is similar to laser printers for sale most of the time. This information allows actual cost per page of printing to be calculated. In the 1990′s a group of printer manufacturers banded together to create the parallel interfaces.
Even in the best of situations you should expect to have hours of downtime if a replacement printer is needed. Not all Lexmark cartridges are labelled “single use only. Since receipt printers are always located next to the point of sale terminal, long distance cable runs are not an issue.
You keep backup supplies such as ribbons and paper for your printers. Those buying printer ink cartridges in the UK and elsewhere are advised to investigate the policies surrounding the reuse or refill of these indispensable items before engaging in this practice. Usually this is the exact opposite of Canon printers for sale. Unless you screw in a serial cable you will have the same problem with cables coming loose.
Note that I said most, as there are some printers that do have multiple interfaces. By utilizing an otherwise ignored communication interface, freeing up other interfaces to be used for other devices and by having a locking connector parallel receipt printers are truly the perfect receipt printer for point of sale systems. You are not as stressed by having your point of sale system be crippled by a down printer.