---
title: Choose the KNX value sent by a Link’nX function based on its DPT
description: "Binary, decimal number or short DPT 16 text: choose the value that a Link’nX hysteresis or presence detection function sends to its KNX target address."
canonical: https://wiki.can-nx.com/en/guides/link-function-values/
language: en
product: Link’nX
audience:
  - administrateur
  - installateur
context: "Link’nX web: Functions, hysteresis and presence detection output values"
---

# Choose the KNX value sent by a Link’nX function based on its DPT

Context: Link’nX web: Functions, hysteresis and presence detection output values

A Link’nX function sends a value to its target group address: the low or high threshold value for a hysteresis, the timeout value for a presence detection. The format of this value depends on the target DPT: binary, number or short text.

Intended for installers and administrators who know the DPT and the command of the target address. The form checks the format of the value, not its effect: choose it according to the command expected by the equipment.

## Open the value fields

1. Open **Functions**, then the function’s **Edit** pencil, or prepare it from **Add**.
2. First fill in the target DPT in the [hysteresis form](https://wiki.can-nx.com/en/guides/link-function-hysteresis/) or the [presence detection form](https://wiki.can-nx.com/en/guides/link-function-presence/).
3. For **Hysteresis**, use **Low threshold output value** and **High threshold output value**. For **Presence detection**, use the field after **Then send the value** in **Timeout action sequence**.

## Enter the value according to the target DPT

| Target DPT | Value to enter |
| --- | --- |
| Family 1 (binary) | Explicitly choose **0 (false)** or **1 (true)** in the list |
| Numeric | Enter the appropriate number, with a dot for decimals, for example **18.5**; a negative value only if the DPT and the equipment’s command provide for it |
| **16.000** or **16.001** (text) | Enter a short text in ASCII letters, 14 characters maximum, for example **Idle** |

**18.5** and **Idle** are fictitious examples.

For text, the procedure covers text that is neither a number nor one of the words **true** or **false**. For a text made of digits that must be kept exactly, a longer text or other characters, contact support with the format you need, without sending any secret data.

Each value is required; zero is a filled-in value, different from an empty field. The output fields are separate from the source measurement thresholds and from the timer delay.

Choosing a binary DPT can adapt the fields and their values: check all the outputs after each DPT change.

## Check the result

1. Reread the values, the target DPT and the destination in **Runtime interpretation**.
2. Check the intended state, **Enabled** or **Disabled**, then click **Save** or **Update**.
3. Wait for the confirmation and check the values on the function card in the list.

## Troubleshooting

- Binary hysteresis source or value type not covered here: contact support before commissioning.
- Value not kept as expected or unexpected result: go back over the [function checks](https://wiki.can-nx.com/en/guides/link-function-help/), then write to support@can-nx.com with the context, the DPT, the expected result and the tests already made.