Advantech Multi Serial Port Card, CAN Card, 2-port CAN Interface Universal PCI Communication Card with Isolation Function PCI-1680U is a communication card specifically designed for connecting CAN networks and PCs. Through the built-in CAN controller, PCI-1680U achieves bus arbitration and error detection through automatic retransmission function, greatly reducing the probability of data loss. The onboard CAN controllers are distributed in different locations of the memory, allowing you to independently run two CAN controllers simultaneously. PCI-1680U not only has a universal PCI interface, but is also compatible with 3.3V and traditional 5V signal systems.