An electronic injector including an electronic on-body injector for use with a patient to deliver a fluid through an injection device. Accordingly, it is possible to form a constant gap between the charge roller and the image supporting member, thereby consistently charging the image supporting member. The second microphone generates a second microphone signal that includes a contribution associated with the output signal from the loudspeaker. The component changes a rate of sending diagnostic heartbeat packets from the first rate to a second rate responsive to the change in the data traffic over the communication link.