TOHO ELECTRONICS TTM-10L - Manual (Page 12)

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3.6.8 Storing data other than a store request message
Store all parameters in the EEPROM in either of the three cases described below, even if no store
request message is received.
1) If a parameter is changed by key operation in the communications mode
2) If auto-tuning is started and stopped normally in the communications mode
3) If the communications mode is switched to the local mode
3.6.9 Changing the settings (SV or SV2) by communications during auto-tuning
If a change of the setting (SV or SV2) used in control is attempted through communications during
the auto-tuning, "NAK" and "2" are responded.