The sensors editor allows you to manage the track sensors of the railway:

When you first start using SharpMrc, you should add all sensor addresses of your railway by using the "Add range" button. You can also give a name to each sensor to identify it, but that is not necessary.

The "Occupied" column shows the current sensor status as reported by the railway interface. Occupied track sensors are also shown in red in this window. When SharpMrc is not connected to an interface, you can also click in that column to change the "Occupied" state of a sensor and SharpMrc will react as if that change had been reported by the railway interface.

For all track sensors you should enter the physical length of the sensing track section in cm into the "Length" column. That information is used to calculate the braking of locomotives when approaching a stop signal.

The "Turn-off delay" column specifies for how much time the program will internally consider the sensor to be occupied after it has been reported free by the interface. This is necessary to avoid flickering. 1000 - 1500 ms are usually good values. You can change this value for a lot of sensors at once by using the "Change turn-off delay" button.