Being prompted for pin when the Debit EDC is turned off:
First data supports
"Dual Message Format." This means all transactions should run as CREDIT.
First Data will read the CHIP and determine if the card uses a Credit or Debit AID as its primary function.
If the primary AID is DEBIT the terminal will prompt for a DEBIT PIN.
Users can bypass the PIN by pressing ENTER or the GREEN button.
On the Terminal:
If you attempt to change the EDC Type (Transaction Type) on the terminal from Credit to Debit the terminal will display "CREDIT ONLY".
All transactions should be run as CREDIT.