When you turn on your computer, Sentry 2 panel lights up as you can see in Figure 6. The panel looks is clean and pleasant, being reasonably discrete despite of being very colorful. On the screen you can find four main areas, each one with a funcion, which we will describe below.

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Figure 6: Working.

On the right side, where there is a fan icon, you must touch to select, sequentially, each one of the fans and the respective temperature sensor. When the number "5" is highligted and you touch the fan icon on the panel, all the numbers get highligted and temperature shows "--"; we couldn't find what is the purpose of this mode. Touching it again, channel 1 lights again. This fan icon stays "spinning" when the fan connected to the selected channel is working and stops when the fan stops.

On the upper left corner we can see the temperature reading, correspondent to the sensor indicated by the highlighted channel number. Touching this area the programmed alarm temperature shows off. Touching there for a few seconds, the panel changes the temperature unit from Celsius to Fahrenheit or vice versa.

On the center area you can read the words "auto" and "manual", and touching there you can change the working mode of the selected fan. In "auto" mode, fan speed is adjusted according to the temperature read on the corresponding sensor and in "manual" mode the speed is manually adjusted.

On the left lower corner there are two "virtual buttons" with "+" and "-" symbols, which adjust the alarm temperature and the fan speed when the panel is in manual mode. This rotation speed is shown both in percentage with two digits and through a bar formed by blue boxes.

Finally on the right side there are two virtual buttons. On the upper corner there is an "R" that if pressed for three seconds restarts the panel an loads the default settings. On the lower corner there is an on/off icon that if pressed for three seconds turns off the panel lights.