I am using the configuration of the property page to setup the PCI-CAN card. I am using Extended Arbitration Number of 0xFEF100. My code is in VB 5.0. The code works with a number less than 0xFFFFF. The B201002 is an Implentation-specific error in NI-CAN driver. As soon as I try to open the CAN object this error is generated.