AMX UDM-0404 - Manual (Page 58)

Configuration - Devices Page
46 UDM-0404 4x4 Multi-Format Distribution Hub
3. Click the Send to included link to issue the commands (see FIG. 50).
The first command is limited to Power On, Off and A/V Select.
The Device’s commands must have been learned by the UDM-0404 in order to
function. Refer to the Configuration - Protocols Page section on page 59.