Two 120-ohm termination resistors must be guaranteed on the bus or the CAN bus will not function properly.

120Ω termination matching resistors are used to absorb endpoint reflections and provide a stable physical link. Make sure the bus is wired with 120Ω termination resistors at both ends.

The USBCAN-2A and USBCAN-2C Supreme Edition are USB_CAN adapters that come with a built-in 120Ω termination resistor for each channel. To connect the termination resistor when networking, users only need to short the termination resistor terminals (R+, R-) of the corresponding CAN channel with wires.

Each channel of CANalyst-II has two 120Ω terminating resistors, one for each dip switch. To connect the termination resistors during networking, turn the corresponding resistor dip switches down to the ON position.

① If other nodes on the bus have two 120-ohm termination resistors, then the USB-CAN adapter does not need to access the built-in 120-ohm termination resistor;

② If other nodes on the bus have a 120 ohm termination resistor, short the R+ and R- of the corresponding CAN port of the USB-CAN adapter. Alternatively, toggle down one of the dip switches of the corresponding CAN port of the CANalyst-II Analyser Supreme Edition and connect the built-in resistor to the bus.

③ If other nodes on the bus do not have a 120 Ohm terminating resistor, then after short-circuiting R+ and R- of the corresponding CAN port of the USB-CAN adapter and connecting the built-in resistor to the bus, it is also necessary to connect an external 120 Ohm terminating resistor to the bus. Or switch the two dip switches of the corresponding CAN ports of the CANalyst-II Analyzer Supreme Edition.

With the bus connected, switch off all devices on the bus and check that the resistance between CANH and CANL is 60 ohms, approximately 60 ohms indicates that the bus termination resistor is correctly configured.