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FMB641 CAN \ Tachograph (view source)

Revision as of 15:21, 23 March 2022

908 bytes added , 15:21, 23 March 2022

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[[image:FMB640_FMS_settings.gif]]

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==CAN Termination resistor==

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FMB641 has electronically controllable CAN termination resistor on CAN1 and CAN2 lines.

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This means that CAN line 120Ω resistance can be switched ON or OFF.

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[[image:CAN Terminator.png]]

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In most cases - devices in CAN communication lines have 120Ω between CAN LOW and CAN HIGH lines. When connecting two CAN devices in parallel - overall resistance becomes 60Ω which is suitable for correct CAN communication.

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<br>By default FMB641 CAN Termination resistor is enabled - therefore when connecting to only one external CAN device - overall resistance will be 60Ω.

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<br>If FMB641 has to be connected to CAN line where there already are 2 main devices with 120Ω resistance - <b>CAN termination resistor has to be turned off </b>. Then overall resistance of CAN line is left unchanged at 60Ω - therefore CAN communication is uninterrupted.

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[[image:CAN_Terminator_scheme.png]]

[[Category:FMB641 Configuration]]

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