Doing more reading I saw that "jisaac" offer a suggestion in a 2007 post.
He suggested using a
DVR(card or standalone) w/ RS485 port > connected Panasonic Data Multiplexer w RS485 port > coaxial control of Panasonic PTZ cam.
Questions:
1. Will this work?
2. If does work what dvr cards and/or Standalone units will work w/ this setup for ptz control.