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TemperatureVolume Corrector TC210
2.5 Securing the values (access rights)
The TC210 differentiates between four access parties. Each access party has a lock and a
corresponding code. The locks have the order of priority
1
Calibration lock – Manufacturer's lock
– Supplier's lock – Customer lock.
The access rights apply both to entries via the keypad as well as for access via the optical
interface. If the lock is locked, all attempts to set values are answered with an appropriate
error message (see Chapter 2.4.2).
Also the reading of values via the interfaces is only possible, for reasons of data protec-
tion, when at least one of the locks is open.
Normally, in addition to the access rights assigned to each individual value, values can
also be changed by the access parties with higher priority. A value, which for example has
"S" ("Supplier") as access rights, can also be changed by calibration officials and a value
subject to the customer's lock can also be changed by suppliers.
Each party with write access for a value can also change the access rights (write and read
access for each party) for this value via the interface. This means that also the rights of
parties with higher priority can be changed.
2.5.1 Calibration lock
The calibration lock is used for securing parameters subject to calibration regulations. This
includes all values which affect the volume counting.
The calibration lock is realised as a pushbutton which is located within the part of the
TC210 housing which is secured under calibration regulations. It can be secured under
calibration regulations with a sealing screw (→ 4.6).
The parameters protected under calibration regulations are each identified with "C" in the
lists in the functional description.
The calibration lock is opened by pressing the pushbutton (the symbol "PROG" flashes in
the display) and is closed again when it is pressed again (symbol "PROG" goes out). Clo-
sure is also possible via the interface.
2.5.2 Supplier's and customer's locks
The supplier's and customer's locks are used for securing all data which is not subject to
calibration regulations, but which should also not be changed without authorisation.
The parameters which are write-protected under the supplier or customer locks are each
identified with "S" or "K" in the lists in the functional description (→ 3). All values which are
shown with a minus symbol "-" cannot be changed, because they represent, for example,
measurements or constants.
The locks can be opened by entering a code (the "combination"). (→ 2.5.3, 2.5.4). The
code consists in each case of an eight-character code number.
1
The manufacturer's lock is reserved for ELSTER GmbH and is not described here.
ELSTER HANDEL GmbH
23
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