Brother TC-211

I would read the signals directly from the drives CN8 pins 9 and 10 for example
(with the 7I77 encoder wiring unplugged), If you get no voltage across CN8 pins 9 and 10
it may be that the quadrature outputs are not line driver outputs (though the drive pictures suggest this)
or that the picture is for a different drive and you dont have the drive end connections right

Also not quite sure what you are saying about Z. I thought all axis had resolvers
(though the resolver connections always go directly to the drive where they are converted
to quadrature signals for the controller)

Wil do in about 20 min. Just took my wife to work. I will let you know what I get

Just tried with the z axis. (it is diconected from the machine, so easier to work with)
all the axis have resolvers as you thought

I disconected the plug from cn8 and the motor will not turn at all now. No motion, no signals.

Next I will try at the plug end on the motor/ resolver while it is connected to the drive to see if I get some voltage.

Also had no control from linux.

You cannot remove CN8 or the motor drive will not get any position signals from the motor (so measurements are of no use)

What I meant was looking an the signals from CN8 pins 9 and 10 when CN8 is connected (but the other end is not connected to the 7I77)

On the cn8 plug, there are no wires connected to pin 9 and 10 ??

When I checked I had voltage flucuations upto apx 3 volts.

Also no linux control for the axis.

Back in July I suggested connecting: (note this is encoder 0)

What _did_ you connect to the 7I77 encoder inputs?