In smaller sized greenhouses, a manual system opened and closed by hand could be installed. These work easiest when the screen materials is supported by a monitor system.

Start time – when in the morning will the display screen system start rack drive for greenhouse china operation
Stop time – when in the afternoon will the screen system stop operation
Light level – in what light intensity will the screen become activated either to open up or close
Maximum/minimum temperature – what exactly are the limitations of temperature desired
Maximum/minimum humidity – What are the limits of humidity desired
Gap positions – this units the percent open up or close position under different conditions such as in early stages a winter early morning to lessen thermal shock or through the summer to supply better shading. The gap actions and speed of movement can be controlled in a few systems.
Time delay – under 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 can open the display screen and turn on the heat when it starts to snow.
The typical system uses nylon monofilament or stainless steel cables to support the screen materials. The screen material can either rest along with 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 can be either with a manual change or electronic controller.

Based on the over, the grower must enter the next parameters into the controller:

A weather station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.