Sharp UP-600 - Manual (Page 51)

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(2) When the back-up master breaks down — Master declaration at the
master
1) A satellite detects a breakdown of the back-up master through the system retry function
when it is sending updated GLU/PBLU data to both the master and back-up master. At
this point, the message “NO REPLY/BACKUP” appears in the pop-up window of the
display.
NO REPLY/BACKUP
2) The master declaration operation must be performed at the master. This operation
causes the master to inform all satellites that the back-up master is not available.
3) Each satellite in the IRC system sends updated GLU/PBLU data only to the master.
4) The master processes the received data and sends back the processed data to each
satellite.
Flow of a master declaration at the master
1) Detection of a master breakdown
3) Updated data
Satellite
(Processing)
4) Processed data
(Transmission stops.)
Back-up master Master
2) Master declaration
The master declaration procedure is the same as “(1) When the master breaks down.”