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The 1-Wire bus system is similar to I2C. In a simple way different sensors can be connected to a normal 3-wire cable (ground, data, and +5 V). For connection to a PC, a USB adapter (DS9490R) or serial interface (DS9097U-S09) are available.

Currently, the following 1-Wire components are supported:

  • DS18B20 / Thermometer from 55°C to +125°C, 0.5 exactly from -10°C to +85°C
  • DS18S20 / Thermometer
  • DS2405 / 1-fold: Switch & Input (PIO)
  • DS2406 / 2-fold: Switch & Input (PIO)
  • DS2413 / 2-fold: Switch & Input (PIO)
  • DS2408 / 8-fold: Switch & Input (PIO)
  • DS2450 / A/D converter
  • DS2890 / Digital Potentiometer
  • DS2423P / 4KB Counter
  • DS2438 / Current and voltage measurement

Further links:
Wikipedia: http://de.wikipedia.org/wiki/1-Wire
Hersteller: http://www.maxim-ic.com/products/1-wire

1-Wire-Interest-Group: http://www.1-wire.de


Requirement for the operation of IP Symcon is the current 1-Wire driver (TMEX) which is to be obtained on the following MAXIM page: http://www.maxim-ic.com/products/ibutton/software/tmex/index.cfm

The proper function of the bus and the connected components should be checked with the "OneWireViewer": http://www.maxim-ic.com/products/ibutton/software/1wire/OneWireViewer.cfm

IP Symcon does not support the parasitic mode.
A +5 V power supply is essential!

For further instructions please refer to the instruction manual and the manufacturer's product description.

Tips & Tricks

  • The serial adapter has a different pinout than the USB adapter and does not provide +5 V bus voltage.
  • For power supply a regulated 5V power supply with current limitation is recommended.
  • For smaller systems, we recommend using a modular cable with RJ12 or RJ45 plug for creating cable itself and distributing a 3 Series modular socket. The system is then wired 1:1 (star-shaped junctions).


If you use multiple adapters these can be selected under "Parent instance". How to create a new parent instance, you can find [here] [instances].

Devices should be displayed in the search dialog immediately or after a short delay. After selecting a device, the configuration must be taken before the extended configuration will be visible.

1-Wire: Gefundene Geräte

Unfortunately, the connected components on the 1-Wire bus do not send their values automatically ​​- they must be requested. How often this should happen, that you can specify in __ Timer__:

1-Wire: Timer

Each query cost time and occupies the bus. Therefore, you should use the "timer" sparingly. In practice e.g. an interrogation cycle of 60 seconds to read a room temperature, is more than sufficient. Smaller values ​​of less than one second can not be set.

Furthermore, it should be noted that the more devices are connected to an adapter, the bus utilization increases. In our model house 30 devices are running on an adapter with no problems. We recommend for larger installations to use a separate power supply and multiple adapters.

1-Wire: Mehrere TMEX

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