copies all system configuration variables
from working RAM to non-volatile memory (EEPROM).
This command must be executed in order to retain setting changes
during power cycling.
The SAVE command takes about 2 seconds
to execute and is prohibited while in Zero mode or during
encoder initialization.
For sine-encoder (EnDat) the "regular" SAVE command doesn't save
MPHASE, PFBOFF, and ZPOS variables at all.
Firmware Versions: all
Command Syntax: SAVE
Opmodes: all Drive Status: en/dis