Multiplexing ultrasonic sensors allows ultrasonic bursts to be emitted at staggered intervals. This prevents crosstalk between sensors, and there is no need to maintain a minimum distance between adjacent sensors. However, as the sensors are activated in sequence, the response/reaction time increases with each sensor added to the multiplex array.
A distinction is made between internal and external multiplex mode. When using internal multiplex mode, the synchronization inputs of all sensors must be connected. Depending on the sensor type/family and configuration, multiplex mode either runs automatically, or the sensor must be assigned an address using the configuration tool. In external multiplex mode, an external trigger signal is required and the timed sequence must be coordinated by an external controller.
The sensors are used in equipment and machines with very confined installation spaces, or sensors of the same type in immediate proximity, or to prevent crosstalk in various measurement tasks. Minimum intervals do not need to be adhered to, even if the sensors are located opposite of one another.
- Reliably prevents crosstalk
- An object can be assigned to an ultrasonic sensor
- Additional costs for clock generator when using external multiplexing
- Longer response/reaction time than synchronization mode because the sensors work in sequence