> For the complete documentation index, see [llms.txt](https://support.powerio.com/hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.powerio.com/hub/codesys-hvac/en/hvac-knx-library/functionblocks.md).

# Function blocks

### General about `KNX_Read_DPT_xx`

The usage of all KNX\_Read\_DPT\_xx function blocks follows a similar pattern:

1. **Configure group address**:
   * Set `byAdrMainGroup` (0-31)
   * Set `byAdrMiddleGroup` (0-7)
   * Set `byAdrGroup` (0-255)
2. **Select DPT format**:
   * Select the desired format via `eDPT_Format`
3. **Configure read behavior**:
   * For cyclic reading: Set `tRequestTime` to the desired interval
   * For event-based reading: Use `xRequest` or `xRequestVisu` if necessary
4. **Configure initialization**:
   * Set `eInitOption` on `InitOption.PollingOnStartUp` or `InitOption.InitValue`
   * When `InitOption.InitValue`: Set the corresponding initial value:
     * DPT\_13x: `diInitValue`
     * DPT\_14x: `rInitValue`
     * DPT\_19x: `dtInitValue` (not effective)
5. **Monitor outputs**:
   * Check `tNextRequest` for the time of the next read operation
   * Monitor the corresponding value outputs:
     * DPT\_13x: `diValue`, `rValue`
     * DPT\_14x: `rValue`
     * DPT\_19x: `wYear`, `wMonth`, `wDayOfMonth`, `wDayOfWeek`, `wHourOfDay`, `wMinutes`, `wSeconds`
   * For DPT\_13x and DPT\_14x: Note `sUnit` for the unit
6. **Error handling**:
   * Monitor the error outputs of the parent SlaveBasic block

### General about `KNX_Write_DPT_xx`

The usage of all KNX\_Write\_DPT\_xx function blocks follows a similar pattern:

1. **Configure group address**:
   * Set `byAdrMainGroup` (0-31)
   * Set `byAdrMiddleGroup` (0-7)
   * Set `byAdrGroup` (0-255)
2. **Select DPT format**:
   * Select the desired format via `eDPT_Format`
3. **Set transmit value**:
   * Set the value to send at the corresponding input:
     * DPT\_1x: `xValue` (BOOL)
     * DPT\_2x: `xValue` (BOOL) and `xPrio` (BOOL)
     * DPT\_6x: `iValue` (INT)
     * DPT\_9x: `rValue` (REAL)
     * DPT\_13x: `diValue` (DINT)
     * DPT\_14x: `rValue` (REAL)
4. **Configure send behavior**:
   * For cyclic sending: Set `tTimeUpdateSetp` to the desired interval
   * For event-based sending: Set `xUpdateSetp` or `xWriteVisu` if necessary
   * Optional: Adjust `tPauseTimeUntilNextSend` to configure the send pause
5. **Monitor outputs**:
   * Check `tNextWrite` for the time of the next send operation
   * Monitor the corresponding `*LastBusValue`output for the last received value
   * For DPT\_1x: Also note `Encoding` for the textual representation
   * For DPT\_2x: Also note `xControlBit` for the priority status
6. **Consider unit**:
   * For DPT\_6x, DPT\_9x, DPT\_13x, DPT\_14x: Check `sUnit` for the current unit
7. **Error handling**:
   * Monitor the error outputs of the parent SlaveBasicWr block


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