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357BRemote Operation Of The M400E M400E Ozone Analyzer Operator’s Manual
8.5.7. 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 8-8: Default Hessen Status Bit Assignments
STATUS FLAG NAME
DEFAULT BIT
ASSIGNMENT
WARNING FLAGS
SAMPLE FLOW WARNING 0001
PHOTO REF WARNING 0002
SAMPLE PRESS WARN 0004
SAMPLE TEMP WARN 0008
O3 GEN REF WARNING
1
0010
03 GEN LAMP WARNING
1
0020
03 GEN TEMP WARN
1
0040
2
PHOTO TEMP WARNING 0040
2
OPERATIONAL FLAGS
In MANUAL Calibration Mode 0200
In ZERO Calibration Mode 0400
In SPAN Calibration Mode 0800
2
In LO SPAN Calibration Mode 0800
2
UNITS OF MEASURE FLAGS
UGM 0000
MGM 2000
PPB 4000
PPM 6000
SPARE/UNUSED BITS
0080, 0100,
1000, 8000
UNASSIGNED FLAGS (0000)
LAMP STABIL WARN LAMP DRIVER WARN
O3 SCRUB TEMP WARN
3
FRONT PANEL WARN
BOX TEMP WARNING ANALOG CAL WARNING
SYSTEM RESET CANNOT DYN ZERO
RELAY BOARD WARNING CANNOT DYN SPAN
REAR BOARD NOT DETECTED INVALID CONC
Instrument is in MP CAL mode
1
Only applicable if the IZS option is installed
2
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.
3
Only applicable if the optional metal wool scrubber is installed
146 04315 Rev. C1