It is a custom made card that calculates and transmits car axle count via RS232. There are sensors embedded in the roadbed which transmit on/off signals to this card via an RJ45. The reason I would want to remove it is for replacement. But I do not want to interrupt my operation just to replace a card. This card is actually connected to a backplane. Let me know if you need more detailed info about the backplane. I don't understand why the computer crashes if the card components are electrically isolated from the PCI slot.