The accesScan test tool from Current Concept DesignWorks, Inc. provides technicians, installers and developers an easy way to scan and troubleshoot card reader communication lines and check out system operation. The tool operates either standalone or with mobile devices for additional diagnostics. It reads and generates card swipes, checks for swapped lines, shorts, voltage irregularities. The device can send swipes repeatedly to aid system debug. LED fault notification is provided in standalone operation; additional line details and card data display are provided when used with a mobile device. Simplifies troubleshooting common installation errors, and enables faster system check-out.