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[[image:FMB640_FMS_settings.gif]]
 
[[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]]
 
[[Category:FMB641 Configuration]]