UP-800 (serv.man32). UP-800 In-Line (IRC) Instruction Manual - Sharp ECR User Guide / Operation Manual. Page 59

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