Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 183)

Operating Instructions Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 163
4.15.4.6. Setting Hessen Protocol Status Flags
TAI implementation of Hessen protocols includes a set of status bits that are included in
responses to inform the host computer of the 9110TH/M’s condition. The default
settings for these bit/flags are:
Table 4-36: Default Hessen Status Bit Assignments
Note 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.
STATUS FLAG NAME DEFAULT BIT ASSIGNMENT
WARNING FLAGS
SAMPLE FLOW WARNING 0001
OZONE FLOW WARNING 0002
RCELL PRESS WARN 0004
BOX TEMP WARNING 0008
RCELL TEMP WARNING 0010
PMT TEMP WARNING 0040
CONVERTER TEMP WARNING 0080
WARMUP MODE 1000
INVALID CONC 8000
OPERATIONAL FLAGS
In Manual Calibration Mode 0200
In O
2
Calibration Mode 0400
In Zero Calibration Mode 0400
In Low Span Calibration Mode 0800
In Span Calibration Mode 0800
UNITS OF MEASURE FLAGS
MGM 2000
PPM 6000
SPARE/UNUSED BITS 0020, 0100
UNASSIGNED FLAGS
Box Temp Warning Analog Cal Warning
System Reset Cannot Dyn Zero
Rear Board Not Detected Cannot Dyn Span
Relay Board Warning O
2
Cell Temp Warn
Manifold Temp Warn AutoZero Warning
Ozone Gen Off Conc Alarm 2
Conc Alarm 1 In MP Calibration Mode
HVPS Warning