Network management (NM) controls ECU transitions between Bus Sleep Mode and Network Mode based on AUTOSAR specifications.

Network management is implemented in CAN buses and Ethernet buses based on AUTOSAR specifications and is automatically configured for CAN networks with NM capability. To enable or disable this feature, you must specify the ConfigureNM tag for the port in the NI-VCOM Configuration Tool. By default, NM is enabled for CAN and disabled for Automotive Ethernet.

Three NM signals appear in the signal tree for each configured ECU:

  • NM_enable—This signal is added for the Channel and ECU. When this signal is on, the ECU is enabled to send network management frames.
  • NM_sleepInd—This signal triggers network release and prepares the ECU to go to Bus Sleep Mode. When this signal is on, the ECU does not send any network management frames.
  • NM_wakeUp—This signal triggers network requests. When this signal is on, the ECU starts to send network management frames again.
    • Figure 12. Network Management Signals Available in the Signal Tree


    Not all the ECUs in a CAN or Ethernet network have network management frames. For these ECUs, network management signals do not appear in the signal tree. When the NM_sleepInd signal is turned on, the ECU stops sending network management frames immediately. However, other frames send until the Bus Sleep timeout is reached, as indicated in Network Descriptor file.

    To access more information about a CAN port state, set the EnableBusState parameter to true, which creates an additional folder with the same name as the hardware port as well as an additional signal, ResetTransceiver.