UP-3500 (serv.man32). UP3500 (V2) In-Line User Manual - Sharp EPOS User Guide / Operation Manual. Page 50

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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