Operation Manual

Z41 Lite
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Figure 52 Relative (1 Bit) Setpoint Control
Finally, when “Relative (float object)” is selected, the control will send 2-
byte floating point values. However, these values will correspond to the
particular increment or decrement (or offset) to be applied each time. This
offset refers to a base temperature and will always be a multiple of 0.5ºC.
As the user touches the increase/decrease buttons in the box, this offset
will vary, always within a certain range defined through the Minimum
Offset and Maximum Offset parameters.
Figure 53 Relative (Float Object) Setpoint Control
Example: suppose the following parameterisation:
- Relative setpoint with a floating point object,
- Minimum offset = -10ºC,
- Maximum offset = 10ºC.
The objects are linked to those from an external thermostat, which can be supposed to
have a base temperature setpoint of 25ºC. After the parameter download:
1. The first touch on the increase button will trigger the sending of the value “0.5”, so
that the thermostat sets the setpoint to 25.5ºC. This value will be then sent through
the status object, and afterwards shown by Z41 Lite in the corresponding box.
2. A second touch will trigger the value “1”, after which the setpoint will become 26ºC.
3. On the third touch, the value sent will be “1.5”, so the setpoint will be set to 26.5ºC.
And so on until the offset sent becomes 10 (setpoint of 35ºC). Any further presses on
the increase button will send the value “10” again, so the setpoint will remain at 35ºC,
while touching the decrease button for the first time will trigger the sending of the value
“9.5”, setting the temperature back to 34.5ºC. On the second button press, the value