# Communicating with the Sounder S500 The Cerulean Sounder S500 features 3 hardware connection options. • Ethernet (100Mb/sec) • USB (12Mb/sec) • 3.3V Serial (115kbaud). After each power up, all interfaces are polled. The first one to send a valid packet is selected as the host, and the remaining interfaces are disabled. **API Compatibility:** S500 communication uses a binary packet format compatible with the Blue Robotics [Ping-Protocol](https://github.com/bluerobotics/ping-protocol). **API Documentation:** Please see Appendix F for the definitions of the officially supported packet formats. These packet types are recommended for new applications targeting the S500 sounder. **Network connection:** Communication happens via UDP or TCP on port 51200. The default IP address for the S500 is 192.168.2.92. The IP address can be configured using SonarView [device discovery](https://docs.ceruleansonar.com/c/v/sonarview/device-discovery-and-ip-addressing). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.ceruleansonar.com/c/s-500-sounder/communicating-with-the-sounder-s500.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.