Abstract: A diagnostics system comprising: a reader unit configured to connect to, and read a signal from, a sensor unit configured to sense a biomarker within a biological sample, the reader unit comprising a control unit configured to control the reader unit; a user computer device configured to be operated by a user of the diagnostic system and configured to exchange data with and provide instructions to the control unit for controlling the reader unit, wherein the control unit is configured to communicate information about an identity of the sensor unit to the user computer device and the user computer device is configured to provide instructions to the control unit for controlling the reader unit based on the identity of the sensor unit.