Data Links represent special components that communicate with the target instrument or spacecraft. There are three types of Data Links: TM, TC and PP (processed parameters). TM and PP receive telemetry packets or parameters and inject them into the realtime or dump TM or PP streams. The TC data links subscribe to the realtime TC stream and send data to the external systems.
Data Links can report on their status and can also be controlled by an operator to connect or disconnect from their data source.
Note that any Yamcs Service can connect to external sources and inject data in the streams. Data links however, can report on their status using a predefined interface and can also be controlled to connect or disconnect from their data source.
Data links are defined in etc/yamcs.(instance).yaml. Example: