NAK errors occur between the client (dsiEMVUS) and the PIN pad. A NAK error means the PIN pad negatively acknowledged a command from dsiEMVUS or dsiEMVUS did not understand the response returned from the PIN pad.
Prior to connecting an Ingenico device, the Ingenico driver will have to be installed on your PC. The driver is available for download here and is located under “Device Drivers” (Ingenico Telium 2 Line).
Here’s how to enable NFC contactless on Ingenico PIN Pads.
Some Ingenico iSC Touch 250 PIN pads may experience touchscreen alignment problems which make signing with the pen or pressing buttons with your finger difficult.
Some VX 805 PIN pads loaded with XPI 8.42b may be shipped from distributors missing 2 parameters required for reliable operation.
Check the instructions below to view different ways to set interface settings for various PIN Pads. Be sure to check back as we add support for new PIN Pads.
This error occurs when the VX805 does not respond to a request due to the following factors.
You get this error when Windows cannot open the com port set in the test app com port is selected in the EMV test app.
You get this error when the VX805 does not have an encryption key loaded to it.