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User manual SCAIME: NU-soft-eNod4B-E-0716_236704-C.doc
10.3.5 Tare
When receiving a ‘tare’ functional command, eNod4 acquires a volatile tare (net measurement is set to 0) value if the
measurement is stable otherwise, after five seconds the command is cancelled and an execution error is reported. If
the tare acquisition is successful b
14
bit of the ‘measurement status’ is set to 1.
10.3.6 Cancel tare
This command erases the current tare value if at least one tare has been previously processed. It also causes b
14
bit of
the ‘measurement status’ to be set back to 0.
10.3.7 Cancel last command
This command sets the response register to 00
H
and allows eNod4 to ignore the functional command previously
received (for example to exit a sequential procedure like a physical calibration).
10.3.8 Theoretical scaling
The ‘theoretical scaling’ functional command involves the ‘maximum capacity’ and the ‘sensor sensitivity’ settings.
When used, this command realizes an automatic scaling to migrate from the factory calibration to the user calibration
(see §8). This calibration must then be saved by sending to eNod4 the ‘store calibration’ functional command. Using
the ‘zero adjustment’ functional command is also recommended so as to completely adapt eNod4 to the application.
10.3.9 Zero adjustment
The ‘zero adjustment’ functional command allows the user to set his calibration zero value by asking eNod4 to acquire
the current factory calibrated measurement. This acquisition duration depends on the measurement stability; if
stability is not reach after 10 seconds, ‘zero adjustment’ command is cancelled and an execution error is reported. If it
is correctly achieved, this calibration zero modification must then be saved by sending to eNod4 the ‘store calibration’
functional command. This functional command can be used any time and has no effect on the user-span that can have
been previously configured through a physical or a theoretical calibration procedure.
10.3.10 Start physical calibration
In order to handle a physical calibration with 1 up to 3 know references, eNod4 first must be told to enter the physical
calibration mode. It is the first step of a sequential procedure.
10.3.11 Calibration zero acquisition
The ‘calibration zero acquisition’ is the second step of the physical calibration procedure. It can only be used if the
‘start physical calibration’ functional command has been previously received. This acquisition duration depends on the
measurement stability; if stability is not reach after 10 seconds, ‘calibration zero acquisition’ command is cancelled
and an execution error is reported.
Note: In specific cases (silo for example), this step is not mandatory because it is possible to command a “zero
adjustment” when the silo is empty.
10.3.12 Segment 1 acquisition
It consists in applying a known reference on the sensor then sending the ‘segment 1 acquisition’ functional command.
This acquisition duration depends on the measurement stability; if stability is not reach after 10 seconds, ‘actual
segment acquisition’ command is cancelled and an execution error is reported.
10.3.13 Segment 2/3 acquisition
Only if the ‘calibration zero acquisition’ and “Segment 1 acquisition” are successful, next step consists in applying a
known reference on the sensor then sending the ‘segment X acquisition’ functional command where X depends on the
value stored in the ‘number of calibration segments’ register. This acquisition duration depends on the measurement
stability; if stability is not reach after 10 seconds, ‘actual segment acquisition’ command is cancelled and an execution
error is reported.
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