> 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/xbb020-and-xbb021-manufacturing-description/introduction.md). # Introduction This document goes through all the parts that make up the XBB020 or XBB021 and how to produce such a device. The only thing that separates XBB020 and XBB021 is the label, where XBB020 is ICU's product and XBB021 is marked with Astec's designation. An XBB020/21 consists of three cards; a BBO and two analogue cards that are connected to the BBO. Everything is mounted in a box and an Ethernet cable is connected for configuration and communication, as well as a power unit with a micro-USB connector for power supply. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://help.boomerang3.com/xbb020-and-xbb021-manufacturing-description/introduction.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.