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Teledyne API T801 NDIR CO2 Analyzer Operation Manual Communications Setup and Operation
127
6.5.2.8. SETTING HESSEN PROTOCOL STATUS FLAGS
Teledyne API’s 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 6-7: Default Hessen Status Flag Assignments
STATUS FLAG NAME
DEFAULT BIT
ASSIGNMENT
WARNING FLAGS
1
SAMPLE FLOW WARNING 0001
INVALID CONC
(The instrument’s front panel display will show the
concentration as “Warnings”)
0080
OPERATIONAL FLAGS
1
In MANUAL Calibration Mode 0200
In CO
2
ZERO Calibration Mode
3
0400
In CO
2
SPAN Calibration Mode
3
0800
UNITS OF MEASURE FLAGS
[N/A – the T801 reports in %]
SPARE/UNUSED BITS
0001, 0002, 0004,
0008, 0010 0020, 0040,
0100, 1000, 8000
UNASSIGNED FLAGS (0000)
BOX TEMP WARNING
CO2 CELL TEMP WARN CAL MP CO2
SAMPLE PRESS WARN CAL MP CO2
RELAY BOARD WARN REAR BOARD NOT DET
CANNOT DYN SPAN SYSTEM RESET
CANNOT DYN ZERO
CO2 CONC ALARM 1
2
CO2 CONC ALARM 1
2
CO2 CONC ALARM 2
2
1
These status flags are standard for all instruments and should probably not be
modified.
2
Only applicable if the analyzer is equipped with an alarm option.
3
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.
07274B DCN6418