ZLG PCIeCANFD-400U, Руководство пользователя, Страница: 10 / 20

PCIeCANFD-400U
PCIe Interface CAN (FD) Card
©
2022
Guangzhou ZLG Electronics Co., Ltd.
8
User Manual
CAN3
2
NC
——
5
CAN_L CAN_L signal cable
24
CAN_GND Reference ground
21
NC
——
3
CAN_SHIELD Shielded cable
22
CAN_GND Reference ground
23
CAN_H CAN_H signal cable
4
NC
——
20
NC
——
2.4 Terminal Resistance
As shown in Figure 2.3, the CAN channel of the PCIeCANFD-400U interface card has a built-
in 120Ω terminal
resistance.The interface card uses the DIP switches S1_1, S1_2, S1_3, and S1_4 to select whether the terminal
resistance of the corresponding CAN0, CAN1, CAN2, and CAN3 channels is connected to the bus network. As
shown in Figure 2.4, set whether the CAN channel uses the 120 ohm terminal resistance. Before delivery, the DIP
switch is set to "ON" by default, that is, the 120 ohm terminal resistance is connected to the corresponding bus
network.
The interface card corresponds to the CAN channel at the endpoint of a CAN network. Set the DIP switch of
the corresponding channel to "ON", or connect a 120 ohm terminal resistance between CAN_H and CAN_L of the
corresponding CAN channel.
Figure 2.4 Terminal resistance selection switch