An electronic driver circuitry for an RF switch diode used in Acoustic Ink Jet Printing systems is disclosed The electronic driver circuitry consists of a PMOS transistor and a poly resistor used to control the onoff states of the RF switch diode wherein the drive current for the RF switch diode is the same as the current in the PMOS transistor. If a calculated value and a corresponding numerical data do not match, the control unit 26 notifies the user about the mismatch. The messages may be of type, among others, SMS, MMS, or EMAIL. Further, the dressing may be flexible and may contour to a shape of a catheter to prevent contaminants from entering the site. An updated position limit of the EMA is determined based on at least the design position limit and the fault-based position limit, and an updated rate limit of the EMA is supplied based on at least the design rate limit and the fault-based rate limit. Also it can be prevented to collide against the door.