Sharp UP-820F - Manual (Page 59)

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(2) When the back-up master breaks down – Master declaration at the master
Flow of a master declaration at the master
1) A satellite detects a breakdown of the back-up master through the system retry function when
sending updated GLU data (and clerk data*) to both the master and back-up master. At this point,
the message “BACKUP DOWN?” appears in the pop-up window of the display of the satellite.
2) The master declaration operation must be done at the master. This operation informs all the
satellites of the breakdown of the back-up master.
3) Each satellite in the IRC system starts sending updated GLU data (and clerk data*) only to the
master.
4) The master receives the data and sends back an acknowledgment signal to the satellites.
*Only for the centralized clerk file system
The master declaration procedure is the same as “(1) When the master breaks down.”
1) Detection of a back-up master breakdown
3) Updated data
Satellite
4) Acknowledgment signal
(Transmission stops.)
Back-up master Master
2) Master declaration