Teledyne 300M - Manual (Page 59)

Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
5.2.1 Signal I/O
The signal I/O diagnostic mode gives the user access to the digital and analog inputs and outputs
on the V/F board. The digital outputs can be controlled through the keyboard. Any signals
manually changed through the signal I/O menu will remain in effect until you leave the signal
I/O menu. At that time the analyzer will regain control of these signals. To enter the signal I/O
test mode, press SETUP-MORE-DIAG-ENTR. When the diagnostic mode is entered, a
message is sent to the RS-232 channel indicating entry into the diagnostic mode. Use the PREV
and NEXT buttons to scroll through the signals. Edit buttons will appear for the signals that can
be controlled by the user. Press JUMP to skip to a specific I/O Signal.
Table 5-2 lists the I/O signals available for the M300M.
Table 5-2: I/O Signals
# Signal Control 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_RESET signal
described below.
1 EXT_ZERO_CAL NO Shows state of status input bit to cause the M300M 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 M300M 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 ZERO_SCRUB_VAL
VE
YES Switches the Autozero scrubber 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 SPAN_VALVE YES Switches the ZERO/SPAN valve. Use this bit to test
the valve function.
7 BENCH_HTR YES Shows the status of the optical bench heater. This has
the same function as the LED in the power supply
module.
(table continued)
5-3