TOHO ELECTRONICS TTX-700 - Manual (Page 14)

3.6.8 Storing data other than a store request message
Store all parameters in the EEPROM in either of the two cases described below, even if no store
request message is received.
1) If a parameter is changed by key operation
2) If auto-tuning is started and ends normally.
3.6.9 Changing the settings (SV or SV2) by communications during auto-tuning
Even if the settings (SV or SV2) used in control for auto-tuning are changed by communications,
the settings (SV or SV2) will not be changed until the auto-tuning ends.
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