I am asking a question as a part of library maintenance for electrical equipment. We have installed a POS machine with credit card swipe on the same outlet as a laser scanner (used to check in books). Apparently, the POS gets a signal immediately that a swipe has occurred and failed before a swipe occurs. If the laser scanner is plugged into a different outlet (we are using an extension cord), everything works. Using extension cords in a commercial facility is prohibited, so does another outlet need to be added? What could be causing the POS to get a swipe signal? Thanks in advance for your help!
Interesting, it sounds like your laser scanner is causing noise on the power cable which then interferes with the POS machines operation. This is probably due to a poorly designed power supply in either of the machines.
If you can't use just a different outlet, then it might be worth trying to put a ferrous nugget around the power cable of the POS machine before you spend the money to put in a new outlet.
A ferrous nugget serves to filter out noise on power cables and many products have them.