Dostmann TFA 30.3200¶

Changed in version 8.0.

Feature	Support
Sending
Receiving
Config

Supported Brands

Brand	Protocol
Dostmann TFA 30.3200	tfa30
TFA30	tfa30

Sender Arguments

None

Config

{
  "devices": {
    "weather": {
      "protocol": [ "tfa30" ],
      "id": [{
        "id": 228
      }],
      "temperature": 18.90,
      "humidity": 41.00
     }
  },
  "gui": {
    "weather": {
      "name": "Weather Station",
      "group": [ "Outside" ],
      "media": [ "all" ]
    }
  }
}

Option	Value
id	0 - 255
temperature	-39.9 - 59.9
humidity	10 - 99

Optional Settings

Device Settings

Setting	Default	Format	Description
temperature-offset	0	number	Correct temperature value
humidity-offset	0	number	Correct humidity value

GUI Settings

Setting	Default	Format	Description
temperature-decimals	2	number	How many decimals the GUIs should display for temperature
humidity-decimals	2	number	How many decimals the GUIs should display for humidity
show-temperature	1	1 or 0	Don’t display the temperature value
show-humidity	1	1 or 0	Don’t display the humidity value

Protocol

After extensive testing it was detected that the Dostman TFA 30.3200 shares most parameters with the tfa and conrad weather station sensors, however due to the differences detected those are described in this document.

The protocol sends 88 pulses like:

603 7630 601 1881 605 1897 610 3803 605 3811 651 3798 618 1884 600 1911 597 3806 599 1909 590 1930 595 1906 594 1905 591 1920 584 3804 593 3829 585 3808 600 1905 591 1937 602 3805 594 3809 599 3821 590 1903 595 1908 593 3826 586 1908 596 3837 597 3825 569 1918 594 3809 597 1911 594 1903 594 1909 591 3829 585 1926 592 1907 590 1972 531 1917 586 1911 607 1895 589 1952 556 3818 590 3811 594 7639

The next step is to transform this output into groups of 2 pulses.

Analysing the pulsetrain, we can distinguish three types of groups:

The first group is defined by a short 2nd
The second group has a long 2nd pulse.
The third group has an extended long 2nd pulse, this 3rd group forms the header and the footer pulse group.

The duration of the pulses varies between manufacturers.

Dostmann TFA 30.3200

605 1905
605 3811
594 7639

Length of pulsetrain is 88.

TFA30 and conrad_weather

498 1992
498 4233
498 8466

Length of pulsetrain is 80 or 86.

It is currently unknown wether the tfa and the conrad weather pro are using identical protocols or not, due to discrepencies in the documentation. The current version of the tfa protocol module can handle both variants using the tfa30 protocol. The differentiation is analysing the header information and the length of the pulsetrain automatically.

We take either of the two other pulse groups to define a logical 0 or a 1. A long 2nd pulse means a 1 and a short 2nd pulse means a 0.

For the above pulsetrain we get the following binary output:

   MSB--LSB       AAAABBBBCCCC AAAABBBB
00 11100100 0 001 110011100101 10100010 0 0 000011

Each (group) of numbers has a specific meaning:

Dostmann TFA 30.3200

unknown: 0 till 1
ID: 2 till 9
unknown: 10
Channel: 11 till 13
Temperature: 14 till 25
Humidity: 26 till 33
Tx Button: 34
Battery low: 35
unknown: 36 till 41

tfa30 and conrad_weather

unknown: 0 till 1
ID: 2 till 9
Channel: 12 till 13
Temperature: 14 till 25
Humidity: 26 till 33
Battery: 34 till 35
unknown: 36 till 41

ID : 11100100 | Channel : 01 | Temp : 0101 1110 1100 | Hum : 00101010 | Bar : 00

The ID is defined as a binary number
The Temperature is defined as a binary number and represents the temperature in Fahrenheit, starting at -90°F). Assuming that the Temp binary value is AAAABBBBCCCC, the formula to calculate the temperature value in °C is

( ((DEC(CCCC)*256)+(DEC(BBBB)*16)+(DEC(AAAA)))/10 -90 -32) * (5/9)

The Humidity is defined as a binary number. Assuming that the Hum binary value is AAAABBBB, the formula to calculate the humidity percentage is DEC(BBBB)*16 + DEC(AAAA)

ID : 228 | Temp : 16.44°C | Hum : 42%

Table Of Contents

Dostmann TFA 30.3200¶