The Versi STEP Control is a multi-zone control with an optional expansion module. The Versi has 24 relay outputs and four analog outputs to control most environmental equipment in the greenhouse. There are 32 inputs for sensors, as well as manual override switches, that are custom programmed to match equipment in each greenhouse. It can have three setpoint periods: day, night and DIF with programmable ramp rates at the onset of each setpoint period for full control over condition changes. The VersiSTEP system also records the status of all inputs and outputs in 15-minute increments and allows the user to view this data in graphical form. Additionally, its built to meet UL standards and includes and aspirated temperature and humidity sensing module with 100 feet of cable.from Wadsworth Control Systems, Inc.