For an example, maybe a telemetry package for an RC airplane, where each of those modules are different sensors (gyro, pressure altimeter, airspeed sensor, etc...)
That is in fact the way that FrSky telemetry is working.
It use a serial connection, and each sensor has a unique ID, f.ex. ALT for altimeter.
The receiver then polls each sensor for a value one at a time and send the data back to the transmitter on the ground.
On the transmitter there is a voice modul, so the values can be read out loud (you can't read and fly at the same time !)