In smaller greenhouses, a manual system opened and closed yourself could possibly be installed. These work easiest when the screen material is supported by a monitor system.
Start time – when each 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 be activated either to open up or close
Maximum/minimum temperature – what are the limitations of temperature desired
Maximum/minimum humidity – What exactly are the limits of humidity desired
Gap positions – this pieces the rack drive for greenhouse china percent open up or close position under different circumstances such as early on a winter morning to reduce thermal shock or through the summer to provide better shading. The gap measures and speed of motion can be controlled in some systems.
Time delay – under changeable climate this avoids frequent opening and closing
Wind speed – To reduce heat loss, the screen could be closed early below 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 steel 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 techniques the industry leading of the screen material. Control is usually either with a manual switch or electronic controller.
Based on the over, the grower is required to 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.