Firmware Commands B-11
The second parameter provides a sample collection time. At the end of each sample
time, the data is reported and if in a continuous mode, the data is cleared internally
and the next sample is started.
Command: SM,n,ttt Command to set data collection mode
n = mode ranging 0 - 4, 7,8
ttt = sample interval in tenths of a second (1 to 36000)
Response: OK Response
Examples: SM,2,60 Command to set data continuous data collection with a
six second sample time. D records reported at end of
each interval.
OK Response
(six seconds pass)
(D record reported - see D record in Data Reporting Records
section in this Appendix)
SM Command to read back the current setting
2,60 Response mode 2 and a 6 second sample time.
For scanning modes (5 and 6) four additional parameters are included. These are a
starting voltage (V
Min
) in microvolts (1000 to 10,000,000), a scanning constant number
(τ) in milliseconds (100 to 1,000,000), a front porch time in seconds (0 to 600), and a
back porch time in seconds (0 to 600).
The scanning mode provides a ramped analog output voltage in synchronous with
particle data collection. During a scanning sample, Z records are reported every
second that includes ten particle count values for each tenth second interval during
the one second record.
The analog output voltage during scanning mode operation ramps according to:
τ
t
e
Min
VtV =
)( where: V
Min
= Starting voltage in volts
t = time into the scanning ramp in seconds
τ = Scanning constant in seconds
The voltage values during the front and back porch time periods are V(0) and
V(t = sample interval), respectively.
Note: If the combination of sample time,
τ
and v
Min
result in a calculated V(t = sample
interval) that is greater than 10.000 volts, an error will be returned and the
current operating mode will not be changed.
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