resistor to test stepper pulses

Thanks for the help from yesterday. I ordered a logic probe from
digikey to check for step pulses in the wiring.

I've got a stepper drive that doesn't seem to be getting signals
from the control and I'm trying to trace the problem.

It occurs to me that I'll need a resistor to ground at the end of
the wire to check for the TTL signal with nothing attached. Correct?

Using V=IR, Knowing the voltage is 5 volts. And a wild ass guess of
25 milliamps for current gives a 200 ohm resistor. Is this the right
value?

Karl