Compumotor Plus stepper drive

I have spent the whole day trying to get a Compumotor Plus drive to run
a motor with step-direction inputs. I downloaded the manual and have
gone through it several times. The drive has a computer on-board that
sets everything. Everything is set through serial port commands
including current rating and microstepping resolution. The problem is
that the units are designed to be used with motors with built in
resolvers.The manual specifies that it will not accept encoder input.If
the motor gets a pulse, it is expected to turn a step. If it doesn't it
keeps trying or gives an error message. It operates just like a servo
motor and is tuned accordingly with a series of switches or through the
RS232. I have gone through the manual several times trying to find a
command that would let me run it without the resolver. All I found were
commands to set the amount of allowable error. So, I shut it down and
got my screwdriver and had a "look under the hood". Three PCB,s one with
the computor circuitry,one small board with the display and tuning
switches, and the power supply/driver board. I found three jumpers
together on the computer PCB.
My question is this: Is it possible to run these drives without the
resolver input? Anyone familiar with these units. They are very
sophisticated. I am impressed. If only I had motors with resolvers.
These are made to be run closed loop.