I-7540D-WF CAN to Wi-Fi Converter User’s Manual (Ver. 2.0, Jan/2012) ------------- 11
2.4 Terminator Resistor Settings
According to the ISO 11898 specifications, the CAN Bus network
must be terminated by two terminal resistors (120
Ω
) for proper operation,
as shown in the following figure.
Figure 2-6: Terminal Resistor
Therefore, the I-7540D-WF module supplies a jumper for users to
active the terminal resistor or not. If users want to use this terminal resistor,
please open the I-7540D-WF cover and use the JP2 to activate the 120
Ω
terminal resistor built in the module, as the Figure 2-7. Note that the
default setting is active.
The purpose of the terminal resistor is used to terminate the electrical
signal, in order to avoid reflected signals interfere with the normal signal
transduction. If the I-7540D-WF is not in the terminal at the CAN network,
the termination resistors should not be enabled.
Figure 2-7: Terminal Resistor Jumper
