In smaller greenhouses, a manual system opened and closed yourself could be installed. These work simplest when the screen material is backed by a monitor system.
Start time – when each morning will the display system start operation
Stop period – when in the afternoon will the display system stop operation
Light level – at what light strength will the screen be 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 models the percent open up or close placement under different circumstances such as early on a winter early morning to lessen thermal shock or Rack Drive For Greenhouse during the summer to supply better shading. The gap steps and speed of movement can be controlled in some systems.
Time delay – under changeable climate this avoids frequent starting and closing
Wind speed – To reduce heat loss, the screen can be closed early below high wind speed conditions
Snow detection – this can open the display 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 material. The screen material 
can possibly rest along with the network of cables or end up being suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that movements the industry leading of the screen materials. Control is definitely either with a manual change or electronic controller.
Based on the above, the grower is required to enter the next parameters into the controller:
A weather station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.