NAK Error From Pin Pad” and “Unsuccessful Obtaining SerialNo from PIN pad” errors occur between the client and card entry device. This means the device Negatively Acknowledged a command from the client or the client did not understand the response returned by the device.
Resolution:
- Verify the latest version of the client control under “Client Controls”.
- dsiEMVUS® (Credit & Debit)
- dsiPDCX® (Gift & EBT)
- DSIClientX® (Swipe/Non-EMV)
- Verify USB device drivers are installed properly. See instructions for installing Ingenico drivers here.
- Verify the com port you are specifying in your point of sale software is the com port of the PIN pad.
