In accordance with a first aspect of the present disclosure, a biometric sensing system is provided, comprising a sensor module; a processing unit communicatively coupled to the sensor module; wherein the sensor module and the processing unit are configured to communicate with each other in a half-duplex mode of communication. In accordance with a second aspect of the present disclosure, a method of communicating between a sensor module and a processing unit in a biometric sensing system is conceived, wherein the sensor module and the processing unit communicate with each other in a half-duplex mode of communication. In accordance with a third aspect of the present disclosure, a corresponding computer program is provided.