Teledyne gfc 7000ta operation manual Default Hessen Status Bit Assignments

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer

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	0080
(The Instrument’s Front Panel Display Will Show The
Concentration As “XXXX”)
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.

Teledyne Analytical Instruments 158