Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 162)

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 144
The pin assignments for the Status Outputs are:
Table 6-24: Status Output Pin Assignments
OUTPUT # Status Definition Condition
1 SYSTEM OK On if no faults are present.
2
CONC VALID
On if CO
2
concentration measurement is valid.
If the CO
2
concentration measurement is invalid, this bit is OFF.
3 HIGH RANGE On if unit is in high range of DUAL or AUTO range modes.
4 ZERO CAL On whenever the instruments zero point is being calibrated.
5 SPAN CAL On whenever the instruments span point is being calibrated.
6 DIAG MODE On whenever the instrument is in diagnostic mode.
7 ALARM1
On whenever the measured CO
2
concentration is above the set point for
ALM1
8 ALARM2
On whenever the measured CO
2
concentration is above the set point for
ALM2
D EMITTER BUS The emitters of the transistors on pins 1-8 are bused together.
+ DC POWER + 5 VDC
Digital Ground The ground level from the analyzer’s internal DC power supplies.