Using Serial Data Commands C-9
SH—Set Hi Conc Threshold
SH lets you set the conditions that will cause the HI CONC LED to light, the
high concentration flag to be set (see RF command), and the APS™
spectrometer to beep if the sound is enabled (see B command).
SHx
where:
x = 0 to 65535 and is the total concentration of particles, in particles/cm
3
.
Note When x =0, the LED, flag, and beep are always on. When x =
65535, the LED, flag, and beep are always off.
The value of x at power up is 1000 particles/cm
3
. The status of the LED is
updated every second.
Examples:
To light the HI CONC LED when the concentration 1500 particles/cm
3
:
SH1500
To prevent the HI CONC LED from lighting at any concentration:
SH65535
SL—Set Laser Power
SL sets the laser power as a percent of full-power.
SLx
where:
x = 0 to 100%
The default when the instrument is powered up is 75%.
Example:
To set the laser power to 50 percent of full power:
SL50
Notes:
Lx command must be Enabled (x = 1) for laser to output power (see Lx
command).
An SL setting <10 may cause Laser LED on front panel to flash (see
Chapter 3, “Indicators”).
Front panel LED may flash if laser is not able to operate at set power.
This indicates that the laser has degraded and may need to be
replaced.
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