Frequently Asked Questions

Welcome to the FAQ page for general questions about our devices, the 1-Wire bus or troubleshooting your 1-Wire system. If you have any problems with any of our products, please try to narrow down the problems and troubleshoot them yourself first. We'll do our best to help you with those.  If you still can't find what you are looking for here, please contact us via our support mail.

The sensors are intended as a comparison sensor for Photovoltaic systems and as an encoder for shading. In the latter application, usually by a certain current value of the start is used for the shutdown of the shading. For PV comparison sensor, the sensor should have the same behavior as PV systems.

The product is not a calibrated irradiance meter, so the values may well differ from an official measuring station. You can tell the difference just by looking at the price. 😊

In addition, the output values are strongly dependent on the angle of incidence of the sun on the sensor and the operating temperature. We performed a type test for the devices at approx. 20°C and perpendicular irradiation. Outside the perpendicular irradiation angle, the values deviate. This is normal.

The dependence on the irradiation angle has the advantage that in winter a different behavior is system-dependent and desired.

If you want to have an adjustment to a measuring station in the surroundings we recommend to include an offset for the calculation.

Possibly a time-dependent offset is necessary for the morning and evening hours, because here the irradiation angle often deviates very much from the perpendicular irradiation of the sensor. This is an issue of the irradiation angle on the sensor.

According to our many years of experience and a lot of feedback from customers, the following conservative recommendation can be made:
-    maximum cable length 50 -120meters
-    number of 1-Wire devices no more than 20 -22 pieces
-    as linear a topology as possible without T-junctions
The topology in particular plays a major role. If possible, it should be installed in a linear topology. The linear topology can be compared like pearls on a pearl necklace. The data line should be laid from one device to the next without T-joints.
Furthermore, the type of cable used can also be mentioned here. We recommend for the cabling
CAT5 or CAT6 network cable. It is also possible to use J-Y(St)Y telephone cables and KNX cables. With CAT5 versus CAT7 cables, longer cable runs are possible.
With twisted pair cables, a longer connection length can be achieved in an undisturbed environment, as the capacitive bus load is lower. A total length of 50 meters and more can be easily achieved without additional measures.
In disturbed, commercial and industrial environments, the cable should always be shielded in order to increase the "robustness" or interference sensitivity of the system.

Probably the network had already reached its maximum size before the additional sensor. The additional sensor now causes effects that can only be eliminated by splitting the network into two 1-Wire networks.

The ECO 10 is the successor of the very successful 1-Wire Controller 1. The ECO 10 now has the new 1-Wire functions, which are called Auto-E-Connect at ESERA.

The ECO 10 is also the technically newer device compared to the 1-Wire Controller 1.

You can connect a 1-Wire Hub to the Loxone controller.
The three tasks of the 1-Wire Hub are:

  1. Central power supply for the 1-Wire network
  2. Distribution for the 1-Wire cabling
  3. Monitoring of 5V and 12V voltages and delivered currents. This function does not work with the Loxone in this case, because the Loxone controller does not know the 1-Wire interface of the 1-Wire Hub (DS2450 command set).
    Only a small number of 1-Wire chips are supported by the Loxone. The DS2450 is unfortunately not included.

Unfortunately no, the 1-Wire Hub has three bus connection terminals, but they are not separate bus segments. The terminals are internally routed together. This means that the 1-Wire data lines of all three terminals are connected to the input terminal without modification.

The three functions of the 1-Wire Hub are:

  1. Central power supply for the 1-Wire network
  2. Distribution for the 1-Wire cabling
  3. Monitoring of 5V and 12V voltages and delivered currents.

The 1-Wire controllers and ECO controllers are designed and limited to 30 1-Wire devices.

According to our experience the max. number of 30 fits well to the most used network size. We have found that most installations are set up with 10 - 24 sensors.

A technical reason for the layout is that the 1-Wire controller, unlike most other 1-Wire masters, can deliver new data from all sensors very quickly and to this end, it outputs data very often. With default settings all sensors are read in a 2-3 second cycle.
The max. number of 30 is therefore a good compromise between the number of read cycles and the number of sensors.

We are happy to check or repair the items you bought from us for you.

Please write as exact a description of the fault as possible on the return note and enclose the return note with the goods. You will receive a confirmation of receipt after receipt.

Please note our terms and conditions (GTC) for the processing of repairs or for the inspection of devices.

Note: We do not accept goods sent freight collect.

Plese send the goods to the following address:



Adelindastrasse 20

87600 Kaufbeuren


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After you receive data from the eBus coupler, the setting is not entirely wrong and we can rule out a defect in the bus coupler with a high degree of probability.

It can have two causes:

  1. On the configuration of ebusd. The USB interface is configured with ebusd by default with a latency of 0.
    When configuring, you must also transfer a higher latency time. Please refer to the ebusd software manual for further details.
    Interestingly, ebusd has a default latency of 50ms for ETH applications. We assume that the value 0 is an error. However, you can configure the latency time when starting the service. Please refer to the ebusd documentation for more details.

  2. If you supply the bus coupler via a power pack, depending on the type of power pack, problems may arise if you have not grounded the minus output voltage. In other words, connect the yellow/green connection to the negative side of the power supply.
    Disturbances often occur with DIN rail power supplies in particular, since the power supplies are intended for machines in which the negative voltage is always grounded and EMC interference is derived from this.