If want PESS to sounding continuously, should be send the request message continuously more than 1000ms. During that, which the time exceeded was sent and including the time of retry sending was setting at meter by request message. When receive request message of PESS again from the beginning, that the time of sounding was reset.
Before 1 cycle of sound was finished and no request message again, the sounding will stop. (If key reminder buzzer has ended with this condition, the sound will stop immediately.)
When receive high priority messages, it will switch immediately.