Sharp ER-A770 Instruction Manual download pdf (Page 15)

9. T-LOG polling

All REG-mode transaction data in each satellite is saved in its T-LOG buffer. T-LOG polling is a

data collecting system in which the master collects data from the T-LOG buffers in satellites.

T-LOG polling becomes available upon open-store operation and becomes unavailable upon

close store operation.

A request for T-LOG polling is issued from the satellite to the master when the number of data

records in its T-LOG buffer exceeds a predetermined number in the open store state.

As the master detects such a request, it starts collecting the T-LOG buffer data. After collection

of the data from one satellite, the master waits for a preset time and starts collecting data from

another satellite. In T-LOG polling, the data transmitted to the master is stored in the

corresponding file.

The data flow in T-LOG polling is shown below.

Polling sequence (see the figure above)

(1) Satellite A makes a request for polling.

(2) The master detects the request and starts collecting T-LOG data from satellite A.

(3) The T-LOG data is sent to the master.

(4) After receiving T-LOG data from satellite A, the master waits for a preset time.

(5) The master detects a request from another satellite (B, C or D) and starts polling for it.

If its T-LOG buffer becomes full, registration will be disallowed at a satellite when it has been

programmed for “LOCK UP,” and allowed when it has been programmed for “CONTINUE.” For

how to specify whether the registration is disabled or enabled when the T-LOG buffer becomes

full, please refer to the ER-A770 instruction manual.

Master

Satellite A Satellite B Satellite C Satellite D

(4)

(1)

(2)

(3) (5)

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Sharp ER-A770 Instruction Manual Page 15