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If you are using the ViX250AH then you are using the wrong user guide. The ViX250AH is the Drive Only version. The Drive/Controller version is the version necessary to have the ViX respond to motion commands. As a Drive Only, it must be controlled either by Step/Direction signals, or an analog +/- 10V that corresponds to requested torque or velocity. From the STATUS response that you posted, the drive looks to be in Velocity Mode so it is expecting the Enable digital signal and the analog Velocity signal. Both of these are connections on the X4 connector.
If you really need the serial interface, you would need the Drive/Controller version ViX250IH.