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Teledyne API Ultrafine Particle Monitor - Model 651 APPENDIX A Firmware Commands
07506C DCN6727 A-9
RRD – Read Data Record
RRD returns the current data values in the “D” record format. Data
records are collected according to the time period you have
specified for the data collection interval.
RRD
Command RRD
Response D record (see below)
D Record identifier
Date Date in yyyy/mm/dd format
Time Time in hh:mm:ss format
Flags Status Flags (see information in RIE command
description)
Conc Aggregated concentration calculated by dividing
the accumulated aggregate counts by the live-
time of the sample flow rate (2 cm
3
/sec). The
aggregated counts and live-times are
accumulated each 1/10
th
second interval. The
overflow flag is set when the concentration value
exceeds the maximum specified concentration.
AT Elapsed sample time 0.1 sec resolution (0.1 to
3600)
LT Live time 0.001 sec resolution (0.001 to 3600)
CNT Accumulated particle counts
Photo Average photodetector value in mV
Reserved Blank reserved space
PH Average pulse height in mV
PSTD Pulse height standard deviation
Example D Record:
D,2012/11/2,08:01:21,0,1.04e4,6.0,4.4,769424,140,,0,0
Record Type Date Time Flags Conc AT LT CNT Photo PH PSTD
D 2012/11/2 08:01:21 0 1.04e4 6.0 4.4 769424 140 0 0