After considerable work with PCEftpos and NAB on behalf of a customer encountering problems using a NAB terminal to process EFTPOS payments through PCEftpos into our software, we received confirmation that there is a known problem.  There is a firmware fix being tested at the moment which NAB and PCEftpos hope will fix the problem.

The firmware problem on the banking terminal caused the host Point of Sale software to freeze.  Our understanding, based on what we have seen to date, is that the problem is isolated to NAB terminals.