The present disclosure includesIn a method of operating a user terminal (7) of an agricultural machineThe user terminal (7) of the control system (3) of the agricultural machine is provided；User terminalConnected to the power supplyThe functional element of the agricultural machine (10a) via control bus10B is configured to transmit a control signal.ProvidingThrough the supply lineAt the voltage level provided by the power supplyThe application of power to the user terminalVoltage levelNormal operating voltage levelApplyingTurn on state of the ignition device of agricultural machineSupply power provided by power supply (13) in the supply lineLowering to lower voltage level lower than the lowest operating voltage levelDetermining at least one ofMinimum operating voltage levelBelow normal operating voltage levelThe drop in supply power isTriggered by switching the ignition device to turn onDecisionDepending on the decisionBy voltage up scaling devicesTo the boosted voltage levelIt is to raise the voltage drop LevelThe boosted voltage level isAt least the minimum operating voltage levelBoostingWhile the ignition device is turned onWith a power supply having a boosted voltage levelOperating user terminalIgnition off state of the ignition deviceThe end of the drop in the supply power provided by the power supply (13) in the supply line andDetermine at least one ofDepending on the decisionTerminate the reduction voltage level andAt the voltage level provided by the power supplyThe application of power to the user terminalVoltage levelNormal operating voltage levelApplyingIncludingRelated to the method.Further, an agricultural machine is provided.Diagram本開示は、農業機械のユーザー端末（７）を動作させる方法において、農業機械の制御システム（３）のユーザー端末（７）を提供することであって、ユーザー端末（７）は、電源（１３）に接続され、かつ制御バス（６）を介して農業機械の機能要素（１０ａ、１０ｂ）に制御信号を送信するように構成されている、提供することと、供給ラインを介して、電源（１３）によって提供される電圧レベルで、ユーザー端末（７）に供給電力を印加することであって、電圧レベルは、通常動作電圧レベルである、印加することと、農業機械の点火装置のターンオン状態と、供給ライン内の電源（１３）によって提供される供給電力の、最低動作電圧レベルよりも低い低下電圧レベルへの低下と、の少なくとも一方を決定する
