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.
Master
(4) 
Satellite A | Satellite B | Satellite C | Satellite D |
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.
