MODBUS Register Map v1.48
248083408-1 Rev 1 A-17
Note: Only Particle data
types have numbers in
their strings.
Particle data items are typed specially. They contain numbers,
sometimes a space and sometimes a period used as a decimal point.
These entries are used to identify particle channel sizes and are always
expressed in microns. These types represent raw counts only.
Data Units Registers
The 42xxx register series identifies the units used by data items in the
30xxx series. These registers run in parallel with the Data Registers.
For example, Data Register 30010’s Units Register is 42010.
Note: Not all data types
have units. LWS Particle
Counters may use units
not on the table.
Units are stored as 4 character ASCII strings across 2 registers. If the
Units string contains less than 4 characters or no characters at all, the
rest of the string is padded with NULLs.
The table below shows units that may be sent by the device. Some of
these units are not currently used but are reserved for future use.
Table A-16 Examples of Particle Data Items
String Description
0.3 Particle type of size 0.3 micron
1.0 Particle type of size 1.0 micron
20.0 Particle type of size 20.0 micron
.015 Particle type of size 0.015 micron or 15 nanometer
Table A-17 Data Units
Units Description Units Description
# Count (For Particles) ft/m Feet per minute
% Percent m/s Meters per second
s Seconds “H2O Inches of water
min Minutes “Hg Inches of mercury
hour Hours mmWa Millimeters of water
F Fahrenheit mmHg Millimeters of mercury
C Celsius cmHg Centimeters of mercury
K Kelvin Pa Pascals
ft Feet kPa Kilopascals
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