If you are mounting the iButton outside, please remember to use a rainproof cap for the device as the iButton always have voltage flowing through the wiring and any water that gets into the wiring can cause issues and also the oxidation of the metal housing. Red LED: Operating voltage 1.95V, current 20mA Green LED: Operating voltage 2.1V, current 20mA If you have purchased your iButton Reader before 2015, then no current limiting resistors are built into the product and the LEDs must be driven as follows. Green = Green LED, Red = Red LED. Both LEDs can be directly driven of 24V, we recommend to use digital outputs for this. The yellow wire is the common ground for both LEDs. The white wire is wired to ‘DQ’ on the extension and the grey wire is wired to ‘GND’. The iButton reader is connected to the Loxone 1-Wire Extension. Because you use a CAT cable to wire the 1-Wire sensors and switches the remaining cores can be used for the switch plate. Extensionġ-Wire temperature sensors can be hidden behind switch plates due to their small size. It is important that the space behind is sealed though to prevent drafts and poor readings. Ground and data should be twisted against each other. Separately powered: All three pins of the sensor should be connected to the Loxone 1-Wire extension. Please refer to the manufacturer’s datasheet. Note that not all one wire sensors can be used with parasitic power supply wiring topology. Extensionġ-Wire Temperature Probe (ordered before 2015) Parasitically powered: When wiring so the 1-Wire sensor is parasitic, GND and VDD are connected together and GND is connected to the extension. The pin assignments can vary between sensors so please refer to the manufacturer’s datasheet. This is a schematic diagram for connecting the one wire temperature sensor DS18B20+. If the sensors are connected in a ring, then no signals are received. Ring topology is not supported in one wire installations. The maximum total cable length is 100m for 20 sensors. Star topology is recommended only for small installations since all the sensors are brought together at one point. One wire installation in bus topology with long stubs is not recommended as it reduces the maximum total cable length to 100m with 20 sensors. The maximum cable length is slightly reduced to 300m when connecting 20 sensors.
This topology can produce similar results to the bus topology without branches. It allows a maximum range of 350m with a total of 20 sensors. DQ and GND should be connected using a twisted pair so the data signal is twisted against GND.īus topology without branches is best suited for wiring. We recommend you use data cable (Cat5e, Cat6 or Cat7), and you need to use one twisted pair for GND and data.įor longer distances or when running alongside mains cables use STP (shielded twisted pair) cable. Depending on the environmental factors, including cable length and the number of sensors these instructions can vary.
Resolution: 13 Bit or 0.03125☌60Voltage VDDVoltage Supply Programmable Resolution 1-Wire Digital ThermometerĪAD-Converter and Temperature SensorTemperature Range: -55☌ to +125☌ Troubleshooting SUPPORTED 1-WIRE COMPONENTS 1-Wire Device
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