In smaller greenhouses, a manual program opened and closed by hand could possibly be installed. These work simplest when the screen materials is supported by a track system.
Start time – when each morning will the screen Motor Gearboxes For Greenhouse system start operation
Stop period – when in the afternoon will the display system stop operation
Light level – in what light strength will the screen become activated either to open up 
or close
Maximum/minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this pieces the percent open or close position under different circumstances such as in early stages a winter morning to lessen thermal shock or through the summer to provide better shading. The gap techniques and speed of movement can be controlled in some systems.
Time delay – under changeable weather conditions this avoids frequent opening and closing
Wind speed – To reduce warmth loss, the screen can be closed early below high wind speed conditions
Snow detection – this can open the screen and turn on heat when it starts 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 become suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that moves the industry leading of the screen materials. Control is usually 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.
