Step&Direction & servo

I'm looking for step & direction signal converter to +-10 V for servo
amplifiers or the whole servo driver accepting the mentioned control
signals.
In my case, the servos are brushed DC motors. Protection fuses for
them are 35 A. For a feedback from the motor, there are three
resolvers (fine, medium and coarse) for position control and one
tacho for speed control.
Is there any drives / converters like Rutex's products (e.g. types
R997A or R90) http://www.rutex.com/home/servo.htm ?
Othervise they probably are fine exept they do not accept the
feedback I have (at least I think so).

Any advise appreciated

rgds
Juha