ECAN-240-FD (Modbus TCP to 2-port CAN FD Gateway) User Manual
Version 1.0.0
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2.4. Terminal Resistor Notes for CAN Interface
In order to minimize the effects of reflection on the CAN Bus, the bus must be terminated using a
terminal resistor at each end. According to the specifications given in ISO 11898-2, each terminal
resistor should be
120Ω(or between 96Ω and 144Ω). The bus topology and the positions of these
terminal resistors are shown below.
The ECAN-240-FD module includes two CAN ports and terminal resistors are provided for each
CAN port. The terminal resistor can be enabled or disabled via the terminator DIP-switches as
illustrated in following figure.
As indicated in the figure, when the DIP-switch is in the OFF position, the terminal resistor
function is disabled. Similarly, when the DIP-switch is in the ON position, the terminal resistor
function is enabled.
