Sharp UP-600 User Manual download pdf (Page 15)

12. T-LOG polling

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

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

T-LOG polling becomes available upon the 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 while in the open store state.

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

multiple requests are made at the same time, upon completion of data collection from one

satellite, the master waits for a preset time and then starts collecting data from another satellite.

In T-LOG polling, the data transmitted to the master is stored in the corresponding file.

The T-LOG polling data flow 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

specifying whether the registration is disabled or enabled when the T-LOG buffer becomes full,

please refer to the UP-600 or UP-700 instruction manual.

Master

Satellite A Satellite B Satellite C Satellite D

(1) (2) (3)

(5)

(4)

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Sharp UP-600 User Manual Page 15