In smaller sized greenhouses, a manual program opened and closed yourself could be installed. These work simplest when the screen materials is backed by a monitor system.
Start time – when in the morning will the display system start operation
Stop period – when in the afternoon will the screen system stop operation
Light level – at what light strength will the screen be activated either to open up or close
Maximum/Rack Drive For Greenhouse minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limits of humidity desired
Gap positions – this sets the percent open up or 
close position under different circumstances such as in early stages a winter early morning to reduce thermal shock or through the summer to supply better shading. The gap techniques and speed of motion can be controlled in some systems.
Time delay – below changeable weather conditions this avoids frequent starting and closing
Wind speed – To lessen heat loss, the screen could be closed early below high wind speed conditions
Snow detection – this can open the display screen and turn on heat when it starts to snow.
The standard system uses nylon monofilament or stainless cables to support the screen materials. The screen material can possibly 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 leading edge of the screen materials. Control is either with a manual change or electronic controller.
Based on the over, 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.