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For example, the command
0XT+10!
will set the averaging time to 10 seconds for an ACCUBAR
®
at address 0.
Note: The averaging time is not the same as the time till completion of a reading. When the ACCUBAR
®
is awakened by the SDI-12 data recorder and a measurement is requested, the ACCUBAR
®
calibrates its
internal A/D converter before taking the reading. This removes any drift from the analog readings before
the pressure measurement is started.
The ACCUBAR
®
software supports two speed regions. If the requested time is less than 1 second then the
unit enters a higher speed mode. In the high accuracy mode (t >1) there is approximately a 3 second
overhead involved in the initial calibration before the ACCUBAR
®
starts the pressure measurement
averaging. With the high speed mode the overhead drops to 0.4 seconds.
Note: It is recommended that a measurement be manually initiated (an M, M1, or M2 command) after
issuing the XT command to insure that the new coefficients are flushed through the measurement system.
This is particularly true with units operating in the background measurement mode. Depending on when the
XT command is issued with respect to the background measurement, there is the possibility that the first
reading after issuing the XT command will be incorrect.
Resetting the unit to Factory Default Configuration
The ACCUBAR
®
supports a reset to factory default command. The reset to factory defaults command
provides a means to reset most user configurable parameters in a unit back to the factory defaults. If the
previous history of a unit is not known, it is recommended that this command be issued before configuring
the unit to ensure a known starting configuration.
aXFD!
where a is the address character, XFD is the extended command to reset the
unit to the factory default configuration. Note: The address is not changed.
Note: It is recommended that the unit be powered down and back up after issuing this command.
A reset to factory defaults sets:
XUP: Pressure Units to mB (hPa)
XUT: Temperature Units to Degrees C
XT:
Averaging to one sample in slow mode
XE:
Offset to 0 (may have been previously set by the XS command)
XOM: To factory default (dependent upon model).
XOP: To automatically start making readings when an RS-232 connection is made.
XAR: Resets analog output range 0V = 600 mB, 5 V = 1100 mB
XUU: Resets user scale factor to 1 and offset to 0
Items not reset:
Address
Metrology lab calibration coefficients
Resolution of pressure data returned as had been set by the XUP command.
