2. Master declaration. Sharp UP-810F Report sample collection, UP800F, UP820N, UP820F, UP-820N, UP-820F, UP-800F

2. Master declaration

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

Master Back-up master

2) Master

declaration

operation

Satellite

1) Detection of a breakdown

(Transmission stops.)

3) Updated data

4) Acknowledgment signal

Master declaration

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

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The master declaration procedure is as follows:

1.

Enter the PGM2 mode from the mode selection window.

2.

Select “DECLARATION” and press the e key.

The DECLARATION window will appear.

3.

Select “MASTER DECLARE” and press the e key.

NOTE

While the master is down, the back-up master performs T-LOG polling as well.