On the Swipe Simple App, go to the Settings page and tap Device Management to view the list of available card readers that your device can be connected to.
If you are using a Swift B200 or Swift B250, the four digits represent the last four digits of the card reader’s serial number.
Set Default Devices
To set a default reader, select a reader by tapping on it and tap Set Default Reader on the next page.
To set a default printer, select the printer by tapping on it and tap Set Default Printer.
To print a test receipt select a printer and tap Print Test Receipt.