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What is Master Key to unlock my Altivar 21 Programming Parameters ?

The Altivar 21 does not have Master password to protect the programming parameters. 
However, there is a parameter lock that can be done by function F700 (parameter lock), this function has to be set to Zero (0) so that the parameters are unlocked & could be changed 
Refer to the ATV21 programming manual - Page 43 (In the Attachments)

Parameters Lock/ Unlock


ATV21 parameter lock F700.pdf
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