In smaller greenhouses, a manual program opened and closed yourself could possibly be installed. These work easiest when the screen material is backed by a monitor system.
Start time – when each morning will the display system start operation
Stop time – when in the afternoon will the display screen system stop operation
Light level – in what light intensity will the screen end up being 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 sets the percent open up or close placement under different conditions such as early on a winter early morning to lessen thermal shock or during the summer to provide better shading. The gap actions and speed of motion can be Motor Gearboxes For Greenhouse controlled in a few systems.
Time delay – below changeable climate this avoids frequent starting and closing
Wind speed – To reduce temperature loss, the screen could be closed early under high wind speed conditions
Snow detection – this may open the display and turn on heat when it begins to snow.
The typical system uses nylon monofilament or stainless cables to support the screen materials. The screen material can either rest on top of the network of cables or end up being suspended by hooks 
from the cables. A gearmotor powers a drum or rack and pinion that techniques the industry leading of the screen materials. Control can be either with a manual change or electronic controller.
Based on the above, the grower is required to enter the next parameters into the controller:
A climate station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.