# Upper and Lower Connections For the walls, HRB types can be selected for the upper and lower connections. In the assignment, the HRB interpreter then executes that type. For calculations in intermediate values and conditions, it is useful to know which HRB type was selected for the connections. Since version 19.01, the HRB types are now passed to the HRB interpreter via corresponding variables; they can therefore be used in the editor: EOAh Upper connection horizontal EOAs Upper connection angled EUA Lower connection The following is transmitted *empty* (no value) for "automatic" or the HRB type number is transmitted. --- # 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.dietrichs.com/dietrichs-intelligent-documentation/docs-de-en/holzrahmenbau-kompendium/prinzipien-des-hrb-systems/variablen/obere-und-untere-anschlusse.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.