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