Sharp UP-820F - Manual (Page 57)

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When the master or back-up master breaks down, the master declaration procedure should be taken to
inform satellites of the breakdown.
(1) When the master breaks down – Master declaration at the back-up master
Flow of a master declaration at the back-up master
1) A satellite detects a breakdown of the master through the system retry function when sending
updated GLU data (and clerk data*) to the master. At this point, the message “MASTER DOWN?”
appears in the pop-up window of the display of the satellite.
(For the system retry function, see page 63–64.)
2) The master declaration operation must be done at the back-up master. This operation informs all
the satellites that the master has broken down and the back-up master will serve as the master
hereafter. (During this process, any other operation cannot be done at each satellite.)
3) Each satellite in the IRC system starts sending updated GLU data (and clerk data*) only to the
back-up master.
4) The back-up master receives the data and sends back an acknowledgment signal to the satellites.
*Only for the centralized clerk file system
1) Detection of a breakdown
3) Updated data
Satellite
4) Acknowledgment signal
(Transmission stops.)
Master declaration
Back-up master Master
2) Master
declaration
operation
2. Master declaration