The invention provides an apparatus including first and second steering column members disposed for movement relative to one another. In embodiments of the present invention, frame data is converted from an AU-3 frame format into a TU-3 frame format, and the frame data in the TU-3 frame format is mapped into a virtual container VC4 to obtain frame data in the VC4 frame format. upstream of the separation section of the catalytic cracking unit.