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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)