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Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual
Communications Setup and Operation
145
6.7.2.6. 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 6-6: Default Hessen Status Flag Assignments
STATUS FLAG NAME
3
DEFAULT BIT
ASSIGNMENT
WARNING FLAGS
SAMPLE FLOW WARNING
0001
OZONE FLOW WARNING
0002
RCEL PRESS WARN
0004
BOX TEMP WARNING
0008
RCELL TEMP WARNING
0010
IZS TEMP WARNING
1
0020
PMT TEMP WARN
0040
CONV TEMP WARNING
0080
INVALID CONC
8000
OPERATIONAL FLAGS
In
MANUAL
Calibration Mode
0200
In
ZERO
Calibration Mode
0400
In
SPAN
Calibration Mode
0800
In
WARMUP
Mode
1000
UNITS OF MEASURE FLAGS
UGM
0000
MGM
2000
PPB
4000
PPM
6000
SPARE/UNUSED BITS
0100
UNASSIGNED FLAGS (0000)
MANIFOLD TEMPERATURE
2
HVPS WARNING
OZONE GEN OFF
FRONT PANEL WARN
SYSTEM RESET
ANALOG CAL WARNING
RELAY BOARD WARNING
CANNOT DYN ZERO
REAR BOARD NOT DETECTED
CANNOT DYN SPAN
AUTOZERO WARNING
Instrument is in MP CAL mode
1
Only applicable if the optional internal span gas generator is installed.
2
Only applicable if the T200 is equipped with an oxygenator 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.
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