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A valid code is followed by a double signal, an invalid code by a triple signal. After an interval of more than 10-seconds, the already entered part of the code is deleted and the entire sequence has to be re-entered. Code entering: Enter the seven-digit numeric code–or a word with 7 characters a) Operation with parallel code: a double signal is followed. (manager mode) Manager code: 1234567 b) Operation with dual codes: Six-digit numeric codes or words with six characters. (must be programmed)