> For the complete documentation index, see [llms.txt](https://docs.influxtechnology.com/support_guides/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.influxtechnology.com/support_guides/rexgen-series-product-manuals/rexgen-series-usage-guides/savvycan-with-rexgen/sending-custom-can-messages.md).
# Sending custom CAN messages
Open the 'Send Frames' Menu
Click 'Custom'
The below window will open.
Enter the Message details:
* **Bus Number –** 0 or 1
* **CAN ID –** Include 0x before ID if you are entering in HEX
* Length of Message
* **Data –** Example 0x02 0x01 0x0C
* **Trigger –** Time interval 100ms
* **Modifications –** For advanced option, refer to SavvyCAN documentation
Enable the tick to start the transmission
---
# 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 by asking a question.
Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:
```
GET https://docs.influxtechnology.com/support_guides/rexgen-series-product-manuals/rexgen-series-usage-guides/savvycan-with-rexgen/sending-custom-can-messages.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.
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.
