Section 7
Parameter Settings
72
FT742-SM (RS422 & RS485) Sensors
– User Manual
Description
continued
The Saved Parameters are created by means of the USS command. This command copies
the User Parameters and saves them into a separate area in Flash reserved for the Saved
Parameters. The query US command compares item by item the Saved Parameters
against the User Parameters and reports any discrepancy; this command could be used
after USS to confirm that all of User Parameters have been copied correctly in Saved
Parameters. A reset command can be used to load the Saved Parameters back to the User
Parameters. See command RSS (Section 7.4.20) for the details of the RSS command.
After RSF and RSS commands are executed
the restored parameters are loaded into RAM,
so it is imperative to execute any one of the Set Commands described in Section 7.1.1;
executing any one of these commands instructs the sensor to make a non-volatile copy of
the newly created User Parameters.
The Command USS should never be done outside of a laboratory or
controlled environment. This then ensures that the Saved Parameters
copy is not corrupted. Then in the field when changing a User
parameter, if a lightning strike occurs exactly at the same time as an
attempted change and the User version becomes corrupt there is
always a ‘clean’ back up Saved copy of the parameters that can be
used to recover the sensor.
