A mapping scheme between a plurality of control channel element sets and a plurality of acknowledgement channel resource sets is established. The positioning system has a first portion including a damper and a second portion connected to the first portion. The sensor configuration also includes a sensing amplifier coupled to the sensing element, whereby the sensing element in imparted with an electrical stimulus when at least one ink droplet is ejected in the presence of the electric field, and thereafter passes in close proximity to the sensing element without substantially contacting the sensing element. The adapter has two forms: a monopolar adapter having a single opening or a bipolar adapter having two openings.