thanks to all for your reply and to Barry your book is an excellent source - glad I have it. The reason for using DCS passive is as follows: I run conventional, Legacy and DCS. The starting voltage is to high for modern can motors but with Legacy or TMCC I can start from zero. In the passsive mode I can overlay DCS signal on any channel. At least this is what I am trying to accomplish. I did not realize that I can set variable to fixed. Would appreciate more info. If not, I am sure it is in Barry's book. Art
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