Some unsupported card readers may cause the ID-card to lock itself for self-defence.

The values of the key can be found on the GitHub website. There may be a need to limit PinPad mode ( on HP and Dell keypad card readers). To do this, a key must be added to the Windows registry.For PinPad readers, there may be problems with Windows terminal solutions. Terminal systems are not an environment that is officially supported by ID-software.Usually, it is enough to remove and re-insert the card into the reader. In some cases, the ID-software component (such as DigiDoc4) will have to be re-launched and the computer restarted. If the standby and hibernate functions were used with the ID-card still in the reader and any ID-software component open, there may be problems accessing the data on the card.In the case of Linux and macOS, the default installed driver (USB CCID) was tested.On Windows, the card reader generally works with all drivers (manufacturer, Microsoft universal drivers).The name and model of the card reader are generally visible on the label affixed to the reader (usually on the back). The product ID can be found in DigiDoc4 diagnostics. Omnikey Cardman 3821 (PinPad keypad, USB).Gemalto Ezio CT710 (PinPad keypad, USB).Lenovo internal card reader Alcor Micro (manufacturer driver).DellBroadcom internal card reader (WUDF driver).The card readers below have been tested on the operating systems supported by the software. A smart card reader serves as a medium of contact between the contact card and the host, which is usually a PC, a POS (point of sale) terminal or even a wireless mobile device (cell phone).Chip cards may behave differently depending on the operating system on a given computer. The following lists the basic requirements of each operating system and tested card readers.

Smart card readers have electrical contacts located on their outer side. Most contact cards conform to ISO 7816 International Standards. There are two types of smart cards ? Memory cards and MPU/CPU cards. Smart cards contain embedded integrated circuits and are generally made up of polyvinyl chlorides as well as polycarbonates. The product can read smart cards, commonly known as chip cards or ICC (Integrated Circuit Cards). A green, dual state LED on the device serves as a performance indicator. The operating temperature of the product is between zero to 50 degrees centigrade, keeping it operational in almost all except the most extreme environments. Weighing only 12 grams, it is no larger or heavier than a standard USB thumb drive, making it highly portable. It takes full advantage of the USB port, offering up to 12 Mb/sec data transfer speeds and has an insertion limit of about 50,000. The SCR3320 Dongle Reader from SCM Microsystems (now Identive Infrastructure) is a small smart card reader that can read ISO 7816 compliant smart cards.

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