T-log polling – Sharp UP-820F User Manual
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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.
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.
As the master detects such a request, it starts collecting T-LOG buffer data. After collecting 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.
You can specify in the PGM2 mode whether the entry function of a satellite is disabled (LOCK) or enabled
(CONTINUE) when the T-LOG buffer is full.
If it is disabled, an error message “T-LOG FULL” will be displayed and you are not allowed to make any
entry in the REG/MGR mode at the satellite.
If it is enabled, you can continue entries but cannot save the entered data. Even if data is entered after the
T-LOG buffer becomes full, the previous data saved in the file will not be erased.
• If the T-LOG buffer becomes nearly full, an alarm message pattern appears on the display of
the satellite.
• For the programming whether or not to lock a registration entry when the T-LOG file is full, see
the “Function selection 2” of “Optional Feature Selection” section of the UP-820F/UP-820N
Instruction Manual.
• For the T-LOG polling between the master and MWS, please consult your authorized SHARP
dealer.
NOTE
Master
Satellite A
Satellite B
Satellite C
Satellite D
(1)
(5)
(4)
(2)
(3)
11. T-LOG polling