In smaller greenhouses, a manual program opened and closed by hand could possibly be installed. These work easiest when the screen materials is backed by a monitor system.
Start time – when in the morning will the display system start operation
Stop time – when in the afternoon will the screen system stop operation
Light level – in what light strength will the screen end up being activated either to open or close
Maximum/minimum temperature – what exactly 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 position under different conditions such as in early stages a winter morning to lessen thermal shock or through the summer to supply better shading. The gap rack drive for greenhouse china techniques and speed of motion can be controlled in a few systems.
Time delay – under changeable climate this avoids frequent starting and closing
Wind speed – To lessen high temperature loss, the screen can be closed early under high wind speed conditions
Snow detection – this may open the display screen and turn on heat when it begins to snow.
The standard system uses nylon monofilament or stainless steel cables to aid the screen materials. The screen material can possibly 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 leading edge of the screen material. Control is definitely either with a manual change or electronic controller.
Based on the above, the grower is required to enter the following parameters in to the controller:
A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.