1int32 valve_id # ID of the valve. Valves may be indexed from one, zero, or randomly selected.
2float64 set_point # A value from -1.0 to 1.0 for a proportional reversable valve
3 # A value from 0.0 to 1.0 for a proportional valve
4 # 0.0 OR 1.0 for a solenoid (bang bang) valve