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Arduino EIB/KNX Interface via TP-UART

This is a very first version of an interface between Arduino and EIB/KNX using the TP-UART interface and Arduino library.

Last modified 04.06.2024

Hardware

We leverage Siemens BCU 5WG1 117-2AB12 - for about ~30€

-> Please note: When using an additional power supply galvanic separation between ARDUINO and BCU is necessary.

We leverage ARDUINO MEGA (SERIAL PORT 1)

-> No restrictions on the programming

We leverage ARDUINO UNO (SERIAL PORT)

-> During programming, the BCU may have no connection to the ARDUINO UNO.

-> After programming for communication with the BCU. Connect the jumpers ICSP1 PIN 5 and ICSP1 PIN 6 together, tested only with ARDUINO UNO revision 3.

-> For programming the jumper ICSP1 PIN 5 and ICSP1 PIN 6 must be not connected together and the voltage must be taken away for a short time. Then, you can transfer the new "sketch".

Software (library was tested with IDE 1.0.5-R2 and IDE 1.6.9 by arduino.cc)

The Arduino library is found in the directory KnxTpUart and can be directly placed in Arduino's library folder.

Issues, Comments and Suggestions

If you have any, don't hesitate to contact me or use the issue tracker. You are also invited to improve the code and send me a pull request to reintegrate the changes here.

Supported commands / telegram types

All commando (write) to bus :

Bool (DPT 1 - 0 or 1)

knx.groupWriteBool("1/2/3", bool);

4 Bit Int (DPT 3)

knx.groupWrite4BitInt("1/2/3", int);

4 Bit Dim (DPT 3)

knx.groupWrite4BitDim("1/2/3", direction, steps);

1 Byte Int (DTP 5 - 0...255)

knx.groupWrite1ByteInt("1/2/3", int);

2 Byte Int (DTP 7 - 0…65 535])

knx.groupWrite2ByteInt("1/2/3", int);

2 Byte Float (DPT9 - -671 088,64 to 670 760,96 )

knx.groupWrite2ByteFloat("1/2/3", float);

3 Byte Time (DTP 10 - [0-7, 0= no day, 1 = monday ... 7 = sunday], [0-12], [0-59], [0-59])

groupWrite3ByteTime("1/2/3", Weekday, Hour, Minute, Second);

3 Byte Date (DTP 11 - [1-31], [1-12], [0-99] [year ≥ 90 interpret as 20th century, year < 90 interpret as 21th century])

groupWrite3ByteDate("1/2/3", Day, Month, Year);

4 byte Float (DTP 14 - -2147483648 to 2147483647)

knx.groupWrite4ByteFloat("1/2/3", float);

14 Byte Text (DTP 16)

knx.groupWrite14ByteText("1/2/3", String);

All commando (answer) to bus :

Bool (DPT 1 - 0 or 1)

knx.groupAnswerBool("1/2/3", bool);

4 Bit Int (DPT 3)

commented out -> knx.groupAnswer4BitInt("1/2/3", int);

4 Bit Int (DPT 3)

commented out -> knx.groupWrite4BitDim("1/2/3", bool, byte);

1 Byte Int (DTP 5 - 0...255)

knx.groupAnswer1ByteInt("1/2/3", int);

2 Byte Int (DTP 7 - 0…65 535])

knx.groupAnswer2ByteInt("1/2/3", int);

2 Byte Float (DPT9 - -671 088,64 to 670 760,96 )

knx.groupAnswer2ByteFloat("1/2/3", float);

3 Byte Time (DTP 10 - [0-7, 0= no day, 1 = monday ... 7 = sunday], [0-12], [0-59], [0-59])

knx.groupAnswer3ByteTime("1/2/3", int, int, int, int);

3 Byte Date (DTP 11 - [1-31], [1-12], [0-99] [year ≥ 90 interpret as 20th century, year < 90 interpret as 21th century])

knx.groupAnswer3ByteDate("1/2/3", int, int, int);

4 byte Float (DTP 14 - -2147483648 to 2147483647)

knx.groupAnswer4ByteFloat("1/2/3", float);

14 Byte Text (DTP 16)

knx.groupAnswer14ByteText("1/2/3", String);

Once for all DTP -> commando (read) to bus :

knx.groupRead("1/2/3");

Evaluation telegrams from bus :

Bool (DPT 1 - 0 or 1)

value = telegram->getBool();

4 Bit Int (DPT 3)

value = telegram->get4BitIntValue();

Bool (DPT 3)

value = telegram->get4BitDirectionValue();

1 byte (DPT 3)

value = telegram->get4BitStepsValue();

1 Byte Int (DTP 5 - 0...255)

value = telegram->get1ByteIntValue();

2 Byte Int (DTP 7 - 0…65 535])

value = telegram->get2ByteIntValue();

2 Byte Float (DPT9 - -671 088,64 to 670 760,96 )

value = telegram->get2ByteFloatValue();

3 Byte Time (DTP 10 - [0-7, 0= no day, 1 = monday ... 7 = sunday])

value = telegram->get3ByteWeekdayValue();

3 Byte Time (DTP 10 - [0-12])

value = telegram->get3ByteHourValue();

3 Byte Time (DTP 10 - [0-59])

value = telegram->get3ByteMinuteValue();

3 Byte Time (DTP 10 - [0-59])

value = telegram->get3ByteSecondValue();

3 Byte Time (DTP 11 - [1-31])

value = telegram->get3ByteDayValue();

3 Byte Time (DTP 11 - [1-12])

value = telegram->get3ByteMonthValue();

3 Byte Time (DTP 11 - [0-99] [year ≥ 90 interpret as 20th century, year < 90 interpret as 21th century])

value = telegram->get3ByteYearValue();

4 byte Float (DTP 14 - -2147483648 to 2147483647)

value = telegram->get4ByteFloatValue();

14 Byte Text (DTP 16)

value = telegram->get14ByteValue();