It could be network or proprietary bus controlled, the resolvers are not the control per se but the method of motor feedback, generally for sinusoidal AC servo's.
In some cases the resolver is fed back to a semi-intelligent drive and a pseudo encoder signal is derived from this and fed back to a controller and can be scaled according to the resolution you wish.
Resolvers are not of themselves very high resolution devices and usually have to be electronically scaled to be used as an encoder signal.
It may be good equipment. but it depends on if you have to integrate to it or is it self contained?
With networked drives the signal is usually digital format sent over the bus to the drive.
You probabally need more information from the supplier.