> 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/s2-radio-system-manual/general-information.md).
# General information
The S2 radio network has a star configuration. The sensors are connected to S2 nodes which communicate via radio with a central S2 PC node.
The S2 PC node uses a serial port to communicate with B2 server or S2GW gateway that in turn talks to B3 server. Examples of both system versions, collecting readings from S2 radio network, are shown below.
Boomerang 2 with S2 radio network
Boomerang 3 with S2 radio network
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