> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/bbo-gateway-installation-manual/bbo-gateways/1-wire-interface.md).
# 1-Wire interface
BBO gateways use 1-Wire interface to communicate with the sensors and interfaces.
1-Wire interface has +5V, GND and 1-Wire data lines.
There are typically 4 pins with the following markings and functions:
| Marking | Signal |
|---|
| OW | 1-Wire data |
| GND | Power ground |
| GND | Power ground |
| PWR | Power supply +5V |
The GND pins are shorted together in the module.
+5V and GND supply sensors and interfaces, 1 Wire is a common communication line. These lines are connected in parallel to all the units using the interface.
Every 1-Wire bus is controlled by a single 1-Wire master that communicates with multiple 1-Wire slave modules like sensors and interfaces.
In BBO installation, BBO gateway is a 1-Wire master.
The 1-Wire interfaces’ connectors have duplicated all three interface lines to enable easy pass-through connection. Using this method provides a simple way to connect remote groups of sensors using a single 1-Wire cable.
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