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

Start time – when in the rack drive for greenhouse china morning will the display system start operation
Stop period – when in the afternoon will the display screen system stop operation
Light level – at what light strength will the screen become activated either to open up or close
Maximum/minimum temperature – what are the limitations of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this models the percent open or close position under different conditions such as early on a winter morning to reduce thermal shock or during the summer to provide better shading. The gap guidelines and speed of motion can be controlled in a few systems.
Time delay – under changeable weather conditions this avoids frequent opening and closing
Wind speed – To reduce temperature loss, the screen can be closed early below high wind speed conditions
Snow detection – this may open the screen and turn on the 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 either 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 leading edge of the screen materials. Control is certainly either with a manual switch or electronic controller.

Based on the above, the grower is required to enter the following parameters in to the controller:

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