Embodiments relate generally to electricalelectronic hardware, computer software, wired and wireless network communications, portable, wearable, and stationary media devices. The sleeve forms a seal in the bore of a barrel traversed by the plunger, the bore being in fluid communication with a cannula attached to the end of the barrel. The transmitter on the bidirectional communication link polls the receiver in order to determine the count of detected errors, and performs a downshift evaluation for the bidirectional communication link.