In smaller greenhouses, a manual program opened and closed yourself could possibly be installed. These work easiest when the screen materials is supported by a track system.
Start time – when in the morning will the display screen system start operation
Stop period – when in the afternoon will the display system stop operation
Light level – in what light intensity will the screen be activated either to open up or close
Maximum/minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limits of humidity desired
Gap positions – this pieces the percent open or close placement under different circumstances such as in early stages a winter early morning to reduce thermal shock or through the summer to supply better shading. The gap steps and speed of motion can be controlled in some systems.
Time delay – under changeable weather conditions this avoids frequent opening and closing
Wind speed – To lessen temperature loss, the screen can be closed early under high wind speed conditions
Snow detection – this can open the display screen and turn on the heat when it begins to snow.
The standard system uses 
nylon monofilament or stainless cables to aid the screen material. The screen material can possibly 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 movements the industry leading of the screen materials. Control is certainly either with a manual change or electronic Rack Drive For Greenhouse controller.
Based on the over, the grower is required to enter the following parameters into the controller:
A weather station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.