Question for Mariss

Mariss,

During a web search on the motors I have and am
trying to use, I found some posts from a date later
than when I bought my motors, right here in this group.

Here's the question -
How do I know what revision my Gecko G210s are?
Mine are marked with a "90IFX" on the covers.

The reason I ask is that I just found
out that mine may not work for my motors.

The post and motors described are found here -

http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/message/40840?source=1

Basically, they are Nema 42, Sigma 20-4247TD200-F1.3 motors.

200 step
540 oz-in @ 50 sps
635 oz-in holding
22.6 oz-in detent torque
5.0 Amp phase current
1.29 ohms phase resistance
2.2 mH phase inductance
17.4 oz-in^2 rotor inertia
10 lbs. weight, 30 watts dissipation, 8-wire

Also, and this is for anyone, but I think you'll certainly be able
to advise me, am I better off running these in series or parallel?
These are mounted on a RongFu RF20 benchtop mill.

Thanks for your time,

Weyland