You have probably also come across this situation. An incoming value (as number) is not really descriptive. For example, arriving values of 0 or 1 are not always clear to everyone. Or think of different modes of operation a heating system sends out. Who does really remember that 1 is comfort, 2 for night mode and 3 for stand-by? Would'nt it be nicer to have text description?
The state of your alarm system, car port, etc. there are many situations where this will be extremely useful. Let us show you some examples.
Example 3: KNX control - Temperature in the wine cellar (Advanced Tip)
For the most ambitious of you we would like to show you another example of how you can put the new text value displays to use. In this example we'll show you how to express a range of values with certain texts.
In this example, we'll look at a wine cellar. In order to maintain quality wine bottles must be stored at a constant temperature all year long. Even wine connoisseurs don't have all the correct temperatures in their head. This is where ayControl comes in and can display texts ("too cold", "Ideal" or "too warm") based on given criteria. Doing so you can see at a glance how your wine is doing.
The Austrian winery Heinrich recommends storage of red wines between 12°C and 14°C. So the 3 value areas for the temperature "t" are:
1. "Too cold" (t < 12°C)
2. "Ideal" (12°C ≤ t ≤ 14°C)
3. "Too warm" (t > 14°C)
We'll compute the arriving value (the actual temperature) into a value of 1, 2 or 3 (to control which text is being displayed). In iseo Designer, the value of the actual temperature will be named "e1" thus resulting in the following formula:
(e1 < 12) * 1 + (e1 = 12 OR e1 > 12 AND e1 < 14 OR e1 = 14) * 2 + (e1 > 14) * 3
You see the defined value ranges in the brackets. Each one gets multiplied with the number, which will represent the value range. If the expression in any bracket matches the resulting value of that bracket will be 1. Otherwise 0. Because the actual temperature will only match one of the 3 brackets the resulting value will be either 1, 2 or 3. This resulting value will get replaced by the text "Too cold", "Ideal" or "Too warm".
ayControl real life example: Using KNX-blinds with slider control
The newest KNX blinds actuators allow direct control over the position of the shutter elements via byte values. This is exactly the reason to use it for the fine grain control with a slider.
However, there is one caveat (but the workaround is easy). The typical KNX actuators defines the value of 255 as fully closed. The way ayControl sets up the user interface is that the right side is defined as "up" (and refers to the maximum value). This refers to the slider control in general as well as the blinds control. So without any fix, the blinds would work the exact opposite way - sliding the slider to the right would completely close the blinds.
The solution is simple: Switch the minimum and maximum values for the control in iseo Designer.
Further ayControl and KNX topics from Dec 2010:
KNX real life example - easyMOBIZ installed EIB/KNX system in the new office
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