Trouble setting home z axis Tevo Tarantula - M851

I have a tevo tarantula printer running repetier firmware 0.92.8 with the auto bed level option and dual extruded.  This is a new build.  I have not been able to set the Z axis ever.

Following the instructions from multiple sources to set the Z axis home, they all say to start by issuing the command M851 via the software.  I have used repetier host and simplify3d software.  When I enter in M851 in the command line, both software kicks back “unknown command”.  I have tried M851 and M851 Z0.

Currently I cannot use the printer because when the printer run to Z home, the extruded head presses into the bed.  I have to hit emergency stop and kill power then manually raise the Z axis.

How can I set the home z axis?


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