PCIeCANFD-200U/100U
PCIeCANFD Series CANFD Interface Card User Manual
©2021 Guangzhou ZLG Electronics Corp.,Ltd.
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User Manual
2.3 System Connections
When the PCIeCANFD interface card is connected to the CAN-bus bus, you need only to connect CAN_L to
CAN_L and CAN_H to CAN_H signals. The CAN-bus network adopts a linear topology, and the two terminals of
the bus need to be installed with a 120 ohm terminal resistor; if the number of nodes is greater than 2, the 120
ohm terminal resistor is not required for the intermediate node. For branch connections, the length should not
exceed 3 m. Figure 2.2 shows the CAN-bus bus connection.
Figure 2.2 Linear topology of the CAN-bus network
In the CAN-bus network, shielded cables are often used for interconnection, so as to enhance the
anti-interference ability. However, there are many types of shielded cables and field wiring is complicated.
Therefore, the wiring diagrams of different types of cables in application are shown below, including the
connection diagrams of double-core single-layer shielded cables, double-core double-layer shielded cable, and
three-core single-layer shielded cable (The "equipment iron shell" in the pictures refers to the outer shell of the
device, which is grounded by default). Regardless of the type of cable, reasonable changes must be made
according to the complexity of the field wiring. Ensure reliable grounding of the single point of the shielded cable
or ground wire at any time, and carry out on-site wiring in strict accordance with the wiring specifications, so as to
minimize communication errors and exceptions and improve the communication quality and service life of the
bus.
Figure 2.3 Double-core single-layer shielded cable connection
