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# Signal Contro
l
Description
0 DISP_BROWNOUT NO Display brownout is used to keep the
display from getting corrupted during
low line voltage conditions. Circuitry
on the Power Supply board (00015)
senses low line voltage and sets this
bit. The CPU reads this and generates
the BROWNOUT_RST signal
described below.
1 EXT_ZERO_CAL NO Shows state of status input bit to cause
the M300 to enter Zero Calibration
mode. Use to check external contact
closure circuitry.
2 EXT_SPAN_CAL NO Shows state of status input bit to cause
the M300 to enter the Span Calibration
mode. Use to check external contact
closure circuitry.
3 SYNC_OK NO Indicates that demodulation circuitry
on the Sync/Demod Board (00798) is
able to lock-in on the detector signal.
4 SPAN_VALVE YES Switches the Zero/Span valve. Use
this bit to test the valve function.
5 CAL_VALVE YES Switches the Sample/Cal valve. Use
this bit to test the valve function.
6 BENCH_HTR YES Shows the status of the optical bench
heater. This has the same function as
the LED in the power supply module.
7 WHEEL_HTR YES Shows the status of the filter wheel
heater. This has the same function as
the LED in the power supply module.
8 DARK_CAL YES Turns off the detector input to the
Sync/Demod board for electronics
calibration.
9 ELEC_TEST YES Activates the Electric Test diagnostic
circuitry.
10 BROWNOUT_RST YES Resets the DISP_BROWNOUT
circuitry described above.
11 ST_ZERO_CAL YES Status Bit - Zero Calibration mode
Logic high = M300 in Zero cal mode
Logic low = Not in Zero cal mode
12 ST_SPAN_CAL YES Status Bit - Span Calibration mode
Logic high = M300 in Span cal mode
Logic low = Not in Span cal mode
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 55