core/homeassistant/components/velbus/services.yaml

sync_clock:
  description: Sync the velbus modules clock to the Home Assistant clock, this is the same as the 'sync clock' from VelbusLink

set_memo_text:
  description: >
    Set the memo text to the display of modules like VMBGPO, VMBGPOD
    Be sure the page(s) of the module is configured to display the memo text.
  fields:
    address:
      description: >
        The module address in decimal format.
        The decimal addresses are displayed in front of the modules listed at the integration page.
      example: "11"
    memo_text:
      description: >
        The actual text to be displayed.
        Text is limited to 64 characters.
      example: "Do not forget trash"