Sharp UP-820F - Manual (Page 56)

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4
System Back-Up
The IRC system incorporates a back-up system.
One of the satellites can be designated to serve as a back-up master.
For the setup of a back-up master in your IRC system, please consult your authorized SHARP dealer.
When both the master and back-up master are in order, the system works in the following sequence:
1) Each satellite sends updated GLU data (and clerk data*) to the master.
2) The master receives the data and sends back an acknowledgment signal to the satellite.
3) The satellite sends the updated data to the back-up master.
4) The back-up master receives the data and sends back an acknowledgment signal to the satellite.
*Only for the centralized clerk file system
If the master breaks down, the back-up master serves as the master after a master declaration is made at
the back-up master. If the back-up master breaks down, updated data transmission to it can be stopped by
a master declaration at the master. When the master or back-up master recovers from the breakdown, it
resumes its function as the master or back-up master by the recovery declaring operation.
1) Updated data 3) Updated data
2) Acknowledgment signal 4) Acknowledgment signal
Satellite
Back-up master Master
1. How the IRC back-up system works