> For the complete documentation index, see [llms.txt](https://docs.ceruleansonar.com/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ceruleansonar.com/c/ethernet-rov-locator/communicating-with-the-rovl/messages-from-host-to-rovl/valid-commands-from-host-to-rovl-ethernet-only/command-send-ustlc.md).

# Command: SEND-USTLC

Format: SEND-USTLC ON | OFF

Example: `SEND-USTLC ON`

Enables sending of the USTCL output message. This message is intended to support Omnitrack operation but may be useful in other configurations as well.