Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Perhaps I'm misunderstanding this, and I think I might have a guess why, but what would the following Z parameters be for these two ports in a M584? M584 X0 Y1 ZZA:ZB?
They are wires in series internally, and by default, so all you need is z2. No za zb.