DH Instruments PPC4, Operation And Maintenance Manual

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PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 162
QPRR
Purpose Quickly read the last known pressure, rate, on-board barometer reading, control status and
QRPT uncertainty.
Query “QPRR?”
Classic “QPRR”
Remarks The last known Ready condition, Q-RPT or utility sensor pressure, rate of pressure change,
barometric pressure, generation status and Q-RPT uncertainty is replied in the current
pressure unit of measure. Each data field is separated by a comma, and is returned in the
following order:
ready, pressure UNITS, rate UNITS/s, atm UNITS, status, uncert UNITS
Here are the field descriptions:
ready:
‘R’ if the current pressure Ready criteria has been met,
‘NR’ if the criteria has not been met (see the “SR” program message).
pressure: The measured pressure for the active Q-RPT or utility sensor in the current
pressure unit. This is followed by the current pressure unit.
rate: The measured rate of pressure change for the active Q-RPT or utility
sensor in the current pressure unit per second. This is followed by the
current pressure unit of measure.
atm:
status:
uncert:
The pressure measured by the PPC4 on-board barometer in the current
pressure unit (and always absolute). This is followed by the current
pressure unit. Not all PPC4s are equipped with an on-board barometer.
This field is “NONE”if the PPC4 is not equipped with an on-board barometer.
Generation status. Similar to the reply of the STAT command. Can be a
sum of the following states:
0 The system is not generating or holding a pressure or vented.
1 A new generation is preparing to start.
2 Quick ramping to the target.
4 Quick pulsing to the target.
8 Slow ramping to the target.
16 Slow pulsing to the target.
32 Reached the target, will re-adjust as needed to stay ready.
64 Quick ramping to a vent condition.
128 Executing a purge operation.
256 Quickly decreasing the pressure to reach a hard vacuum.
512 System is vented
1024 A new target has been requested but generation has not started.
2048 PWM low pressure control
4096 Dynamic pulsing is being used to control a pressure.
8291 Static pulsing is being used to control a pressure.
16394 Low pressure pulsed control is active.
32768 Very low pressure pulsed control is active.
65536 Determining external volume
The uncertainty is calculated as the measured uncertainty or the delivered
uncertainty, depending on the current setting as determined by the
DISPUNC command. Always returned as ‘0’ for utility sensors.
Example
(enhanced)
Query sent:
Query reply:
“QPRR?”
“R,2306.265 kPaa,0.011 kPa/s,97.000 kPaa, 0, 0.0034 kPa”
“R,2306.265 kPaa,0.011 kPa/s, NONE, 0, 0.0034 kPa ” (no barometer)
Example
(classic)
Query sent:
Reply:
“QPRR”
“R,2306.265 kPaa,0.011 kPa/s,97.000 kPaa, 0, 0.0034 kPa”
See Also “PR”, “PRR”, “SR”, “DISPUNC”
3.2.2, 3.2.27.3, 3.2.29