# RS-485 Upgrade ## Before you begin Make sure you have the following: * Stagehand Pro * Philips head screwdriver * Small flathead screwdriver * Resistor kit (2 @ 680Ω) - Contact if you need them * A known working motor or machine * Spikemark 5.0 or later ## Prepping the Stagehand 1. Unplug the Stagehand and lay it down on its side. 2. Remove the side panel by loosening the thumbscrew on the top of the Stagehand. 3. Look for the model number on the VFD (big grey box) It will either say A800 or A700 ![](/files/zYqht7cYbwu03bCvQg46) --- # 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.creativeconners.com/docs/spikemark/drive-communication/rs-485-upgrade.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.