Appendix G: Native Serial (RS-2332) Communications
Page G-8 Lasair II Particle Counter Operations Manual
Particle alarms are internally modified depending on sampling parameters. If the
box displays data in a normalized output, then this is not an issue. Otherwise,
changing the sample size (either by time or volume) will ratio-metrically change the
alarm setting.
PALARMTYPE [C/D] Select particle alarm type. This is either cumulative or
differential.
PDELAY secs Set the purge delay. This is the time to wait before the beginning
of the first sample. The maximum value is 86399 seconds (23:59:59). (Even if this
is set to 0, there will be some delay before a sample for the pump to spin up.
POP This command erases the oldest sample in the data buffer. The command may
be used in conjunction with the TF command to send the complete data buffer,
sample by sample.
PRALARM [1/0] Enable or disable print on alarm feature. When enabled, the
following conditions will cause an immediate printout: analog alarm, particle
alarm, pump error, laser failure. The printout lists the alarm condition, the location,
and date/time.
SS Start sampling.
SN Set to continuous sampling, with group size = 1.
SPRINT [1/0] Enable/disable the print at end of sample feature.
SVOL cf_volume Set sample volume in feet
3
. This command does not change
the display units from cm, if they are set that way.
Smallest sample volume = 0.1.
Largest sample volume = 1439.98.
TI secs Set sample interval to nnn seconds.
Maximum interval = 86399 seconds (23:59:59).
Smallest interval = 6 seconds.
TIME Print the current date and time. Output format is “YYYY/MM/DD
hh:mm:ss.”
TD yy/mm/dd hh:mm:ss Set the date and time. Any non-digit is considered a
delimiter. Years can be entered as either two digit or four digit. The seconds may be
omitted, and will default to 0.
TF Transmit first data sample (i.e. earliest time). The data is transmitted in
standard CSV format. This command may be used with the POP command to
systematically transmit all the stored data on a Lasair II particle counter.
TL Transmit the last data sample (i.e. latest time). Data is sent in standard CSV
format.
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