Using Serial Data Commands C-25
Correlated (Paired) Data Record (C)
The C record is a multi-record report with a header (C0) followed by n more
records (C1...Cn)
CS,C,0,PNX,tindex,ffff,stime,dtime,evt1,evt3,evt4,total,n,m (the C records
only available in Correlated mode)
CS = Checksum
C = Correlated (Paired) Data Record
0 = 0 indicates header record for C data report
P = C for Correlated Mode
N = N for normal operation
A if in autocal mode
D if in autocal and autocal was “done” at the beginning of this
sample
X = X for spare position
tindex = time index 0 to sample time value - 1
(note if enabled for unpolled operation the
record is always reported when tindex = 0)
ffff = 4 digit hex value for status flags (see RF command)
stime = sample time not corrected for dead time
dtime = dead time (ms for 3321, µs for 3320)
evt1 = number of single hump events
evt3 = number of 3+ hump events
evt4 = number of timer overflow events
total = total (2-hump) particles measured (sum of reported channels,
evt 2)
n = number of C (TOF) records to follow this record
m = number of SS fields per record (set by SCR command)
CS,C,n,c1,c2,c3,... cm
CS = Checksum
C = correlated (paired) data record
n = C1 to Cn records of correlated data where n is the number of
the aerodynamic dia. chan.
(each record contains data for one aerodynamic particle size
channel)
c1... cm = particle counts in each pulse height accumulator bin (no
zeros)
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