Abstract: The invention relates to a process for data input and data output into or out of an electronic data processing means that has an input to which a voltage is applied via a resistor and that is connected to the ground via an input switch, so that the voltage present at the input is higher than a specified voltage value when the input switch is open and lower than a specified voltage value when the input switch is closed, which is recognized by the software running in the electronic data processing means so that, by actuating the input switch, data can be input into the electronic data processing means. In a preferred embodiment that has an output line, the data can be input via the output line so that no separate line is needed.

Abstract: A process is for data input into an electronic data processing means that has an input and an output, and wherein a program runs in a loop that cyclically queries whether an input voltage whose magnitude is greater or small than a specified threshold value is present at the input. One pole of a voltage source is applied via a series connection made up of a first, a second and a third resistance to the other pole, whereby the voltage dropping at the third resistance forms the input voltage. The first resistance and the second resistance can be regulated.

Abstract: The invention relates to a process for data input into an electronic data processing means that has an input and an output, and wherein a program runs in a loop that cyclically queries whether an input voltage whose magnitude is greater or smaller than a specified threshold value is present at the input. One pole of a voltage source is applied via a series connection made up of a first, a second and a third resistance to the other pole, whereby the voltage dropping at the third resistance forms the input voltage. The first resistance and the second resistance can be regulated. If a query indicates that the magnitude of the input voltage is greater or smaller than a specified threshold value, then a synchronization of the first resistance is initiated. The second resistance is regulated in such a way that it is at first smaller than a second limit value and subsequently greater than a second limit value or vice versa. The program forms digital input information on the basis of the number of synchronizations.

Abstract: The invention relates to a process for data input and data output into or out of an electronic data processing means that has an input to which a voltage is applied via a resistor and that is connected to the ground via an input switch, so that the voltage present at the input is higher than a specified voltage value when the input switch is open and lower than a specified voltage value when the input switch is closed, which is recognized by the software running in the electronic data processing means so that, by actuating the input switch, data can be input into the electronic data processing means. In a preferred embodiment that has an output line, the data can be input via the output line so that no separate line is needed.