Teledyne 300 instruction manual Contro, Signal, Description

#	Signal	Contro	Description
		l
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