1
\$\begingroup\$

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!

\$\endgroup\$
  • \$\begingroup\$ POS = Point of sale, not the other thing... \$\endgroup\$ – Funkyguy Aug 27 '15 at 16:44
  • \$\begingroup\$ correct, it is a Point of Sale unit that has a cash drawer and a screen to process payments. There is also a credit card swiper attached to the device. \$\endgroup\$ – Maribel Cabrera Ibrahim Aug 27 '15 at 16:48
  • \$\begingroup\$ A thought comes to mind, are the two pieces of machinery still next to each other regardless of which outlets? If you separated the two to put the laser scanner on a different outlet, then a lot of factors were also removed. \$\endgroup\$ – Funkyguy Aug 27 '15 at 16:49
  • \$\begingroup\$ Funkyguy, if the laser scanner is moved farther away, but still plugged in the same outlet, the swipe fails. If the laser scanner is close, but plugged into a different outlet, the swipe works and does not time out. \$\endgroup\$ – Maribel Cabrera Ibrahim Aug 27 '15 at 17:21
  • \$\begingroup\$ Alright, then I still stand by my answer \$\endgroup\$ – Funkyguy Aug 27 '15 at 17:21
1
\$\begingroup\$

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.

\$\endgroup\$
  • \$\begingroup\$ Thanks for this. I will see if we can do this... might be a quick fix. \$\endgroup\$ – Maribel Cabrera Ibrahim Aug 27 '15 at 17:23
  • \$\begingroup\$ @MaribelCabreraIbrahim You may also be able to use a plug-in noise filter, such as homedepot.com/p/… for example. I don't know what country you're in so you might have to find the correct product for your electrical system. \$\endgroup\$ – DoxyLover Aug 27 '15 at 18:54

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.