CAN232 FD User Manual
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1.4 CAN Network
Before trying to send commands to the CAN232 FD, make sure the unit is attached to a valid CAN network
with at least one other node attached and running. Without another node on the network, the CAN232 FD
will attempt to transmit the message indefinitely (as per CAN 2.0A/B specifications).
Make sure there are terminating resistors on the network. A terminating resistance of 120 ohms is
appropriate for ISO11898 drivers. Attempts to communicate over the CAN network without terminating
resistors can lead to erratic behavior and many long hours of trouble shooting.
CAN ISO11898 specifies a three wire bus: CAN_H, CAN_L, and GROUND. Failure to provide a common
ground between network nodes will create some weird behavior. At best, the system will appear to
communicate correctly until either the weather changes, you touch something, or the date changes. CAN_H
and CAN_L form a differential pair and each one must be referenced to a common ground in order to work
properly.
PIN
Function
2
CAN-L
3
CAN-Ground
7
CAN-H
Содержание CAN232 FD
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