I-7565M-FD USB to CAN/CAN FD converter User Manual (version 1.0.0)
Page: 11
Copyright © 2019 ICP DAS Co., Ltd. All Rights Reserved. E-mail: [email protected]
2.5. Terminal Resistor Setup
In order to minimize the reflection effects on the CAN Bus line, the CAN Bus line
has to be terminated at both ends by two terminal resistors as in the following figure.
According to the ISO 11898-2 specification, each terminal resistor is 12
0Ω (or between
108Ω~132Ω). The bus topology and the positions of these terminal resistors are shown
as following figure.
Figure 2.4 CAN Bus network topology
Each I-7565M-FD includes one build-
in 120Ω terminal resistor for CAN1/CAN2
ports, users can decide if it is enabled or not. The DIP switch for terminal resistor is
under the top side.
Figure 2-5 Location of Terminal Resistor DIP Switch of I-7565M-FD
The following DIP switch statuses present the condition if the terminal resistor is
active (default) or inactive.
Table 2-3 Adjustment of Terminal Resistor
Pin No.
Description
1
ON: Active CAN1 terminalresistor (default)
OFF: Inactive CAN1 terminal resistor
2
ON: Active CAN2 terminal resistor (default)
OFF: Inactive CAN2 terminal resistor
