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Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 158
6.15.4.7. Setting Hessen Protocol Status Flags
Teledyne Instruments’ implementation of Hessen protocols includes a set of status bits that the
instrument includes in responses to inform the host computer of its condition. Each bit can be assigned
to one operational and warning message flag. The default settings for these bit/flags are:
Table 6-31: Default Hessen Status Bit Assignments
STATUS FLAG NAME DEFAULT BIT
ASSIGNMENT
WARNING FLAGS
SAMPLE FLOW WARNING 0001
BENCH TEMP WARNING 0002
SOURCE WARNING 0004
BOX TEMP WARNING 0008
WHEEL TEMP WARNING 0010
SAMPLE TEMP WARNING 0020
SAMPLE PRESSURE WARNING 0040
INVALID CONC
(The Instrument’s Front Panel Display Will Show The
Concentration As “XXXX”)
0080
OPERATIONAL FLAGS
Instrument Off 0100
In Manual Calibration Mode 0200
In Zero Calibration Mode 0400
In Span Calibration Mode 0800
UNITS OF MEASURE FLAGS
UGM 0000
MGM 2000
PPB 4000
PPM 6000
SPARE/UNUSED BITS 100, 1000, 8000
UNASSIGNED FLAGS (0000)
Sync Warning Relay Board Warning
Conc Alarm 1 Analog Cal Warning
Conc Alarm 2 Cannot Dyn Zero
Photo Temp Warning Cannot Dyn Span
System Reset Invalid Conc
Rear Board Not Detected
NOTES:
It is possible to assign more than one flag to the same Hessen status bit. This
allows the grouping of similar flags, such as all temperature warnings, under the
same status bit.
Be careful not to assign conflicting flags to the same bit as each status bit will be
triggered if any of the assigned flags is active.