In smaller greenhouses, a manual system opened and closed yourself could be installed. These 
work easiest when the screen materials is supported by a track system.
Start time – when in the Rack Drive For Greenhouse morning will the display system start operation
Stop period – when in the afternoon will the display screen system stop operation
Light level – in what light intensity will the screen become activated either to open or close
Maximum/minimum temperature – what exactly are the limitations of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this models the percent open up or close placement under different circumstances such as early on a winter early morning to reduce thermal shock or during the summer to supply better shading. The gap techniques and speed of movement can be controlled in a few systems.
Time delay – under changeable climate this avoids frequent opening and closing
Wind speed – To reduce high temperature loss, the screen could be closed early below high wind speed conditions
Snow detection – this may open the display screen and turn on heat when it starts to snow.
The typical system uses nylon monofilament or stainless cables to support the screen materials. The screen material can either rest along with the network of cables or end up being suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that movements the leading edge of the screen material. Control can be either with a manual change or electronic controller.
Based on the above, the grower must enter the next parameters in to the controller:
A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.
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