If Simulink Buses are not created they must be created manually.
To send data through a data writer
- Create a Bus Creator.
 - Set output type to the Simulink Bus compatible with the data writer.
 - Add and name pins so they correspond to members in the Simulink Bus.
 - Connect signals to the pins.
 
Signal names and types has to correspond to the names and types specified by the Simulink Bus as well.
To collect data from data readers
- Create a Bus Selector.
 - Connect it to the data reader.
 - Select the signals to output.
 
Connecting the Bus Selector to a data reader picks the Simulink Bus type automatically.