With the Serial Link device you may control most routing switchers, projectors, shutters or other device parameters that are remote controllable via the common RS 232 and 422 serial protocols. Simply add the serial command according to the device's syntax as a key to the timeline.
Even though, the device's name is Serial Link, you do not necessarily need the hardware device itself. For more information on the connection to the Serial Link hardware, please read these chapters: Serial Link input and Serial Link output.
If you like to control another hardware, please see here an example regarding a projector: Output Protocols > TCP/IP.