In smaller greenhouses, a manual system rack drive for greenhouse china opened and closed by hand could possibly be installed. These work easiest when the screen material is supported by a track system.
Start time – when in the morning will the display system start operation
Stop time – when in the afternoon will the display system stop operation
Light level – at what light intensity will the screen become activated either to open or close
Maximum/minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this pieces the percent open up or close placement under different circumstances such as in early stages a winter 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 lessen high temperature loss, the screen can be closed early under high wind speed conditions
Snow detection – this can open the display screen and turn on heat when it begins to snow.
The typical system uses nylon monofilament or stainless cables to support the screen material. The screen material can either rest on top of the network of cables or become suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that moves the industry leading of the screen materials. Control can be either with a manual change 
or electronic controller.
Based on the above, the grower must enter the following parameters into the controller:
A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.