Within the BMS Server we can split up complex KNX data point types to different sub fields. For example, to activate the sub fields for a 1 byte DALI object, please open the Telegram Definition, select the corresponding group address(es) and change the data type to : 238.600
After restarting the server, you will find the group address and different subfields:
For example, if the value 67 is received, the BMS Server is splitting up the value into the sub fields. 67 means that the DALI ballast 3 has a Lamp Failure.
If you want to send a KNX telegram, you can also use the sub fields. For example of DPT 238.600, if you want to request the status of a DALI ballast, you have to set the sub field .Address to the corresponding address, and .LF and .BF to False. Afterwards, when you set the “- SEND” item to True, the BMS server calculates the value from the different sub fields and then it sends the calculated value to the KNX bus.
Custom DPTs:
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<data_type name="Custom.001" descr="CustomeDPT" length_type="1BYTE" set_flag="T">
<sub_type id="Scene" desc="Scene Number" start_index="0" length="6" length_type="1BYTE" input_type="EIS14" su="U" output_type="UINT8" unit="" pre_offset="0" post_offset="0" scale="1" min_max="" />
<sub_type id="SA" desc="Scene Activation" start_index="6" length="1" length_type="1BIT" input_type="EIS1" su="" output_type="BOOL" unit="" pre_offset="0" post_offset="0" scale="1" min_max="" />
<sub_type id="S" desc="BStorage function" start_index="7" length="1" length_type="1BIT" input_type="EIS1" su="" output_type="BOOL" unit="" pre_offset="0" post_offset="0" scale="1" min_max="" />
</data_type>
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data_type name:
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The name of the custom DPT,which will be used later.
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data_type descr
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Data type description.
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data_type length_type
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Type length of DPT, 1BIT, 2BIT, 4BIT, 1BYTE, 2BYTE, etc....
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data_type set_flag
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Set the DPT flag .
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Filed
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Description
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sub_type id
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The ID of the Sub_Type.
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sub_type desc
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Sub_Type description.
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sub_type start_index
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The start index to read from. !Attention Reading is always from Right To Left.
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sub_type length
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The length of the Sub_Type.
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sub_type length_type
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The length type of the Sub_Type.
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sub_type input_type
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The input type EIS1, EIS2, EIS5, etc....
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sub_type su
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Signed / Unsigned
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sub_type output_type
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The output type.
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sub_type unit
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The Sub_Type unit type °C, K/h, m/s, %, etc...
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sub_type pre_offset
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Giving a Preoffset for the Sub_Type value.
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sub_type post_offset
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Giving a Postoffset for the Sub_Type value.
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sub_type scale
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Sub_Type Scale.
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sub_type min_max
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define the min and max value e.g. "0:10" min is 0 and max is 10.
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In the Data Type line, the new Definition of the DPT should be added. Adding the DPT should follow the sequence <Data_Type Length_Type|Data_Type Name@Display Name>
And in our example the definition will like :
Changes need to be saved, and BMS Server reopen in order to apply the new changes. After that the new Datatype will added to Telegram definitions and ready to use.
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