Lighthouse REMOTE Liquid Particle Counter (MODBUS Output) Operating Manual
B-8
248083227-1 Rev 8
Note:
Particle data is
always a cumulative raw
count regardless of the
instrument’s settings.
The timestamp field indicates when the data record was recorded.
Timestamps are stored as the number of seconds since 1/1/1970, the
Unix time epoch. This value can be written directly into a C/C++
time_t data type to be used by ANSI C time functions.
Data Status Byte (30007 - 30008)
Note:
Although
MODBUS sends 4 bytes of
status information,
Lighthouse instruments
only use the first (least
significant) byte.
The registers used for the Data Status Byte are 30007 and 30008.
The bit order of the Data Status Byte is 7 to 0, where bit 7 is the most
significant bit and bit 0 is the least significant bit.
The bits within the Data Status Byte are flagged to indicate particular
conditions of the currently indexed data record.
If multiple states occur, the bits are added together. For example, a
Flow Alert and a Particle Overflow would return a value of 6 in register
30012
unsigned integer
Particle Channel 2 [low]
30013
unsigned integer
Particle Channel 3 [high]
30014
unsigned integer
Particle Channel 3 [low]
30015
unsigned integer
Particle Channel 4 [high]
30016
unsigned integer
Particle Channel 4 [low]
30017
unsigned integer
Particle Channel 5 [high]
30018
unsigned integer
Particle Channel 5 [low]
30019
unsigned integer
Particle Channel 6 [high]
30020
unsigned integer
Particle Channel 6 [low]
30021
unsigned integer
Particle Channel 7 [high]
30022
unsigned integer
Particle Channel 7 [low]
30023
unsigned integer
Particle Channel 8 [high]
30024
unsigned integer
Particle Channel 8 [low]
...
30074
unsigned int
Valid particle channels
30076
unsigned int
Alarm Flags - Particle Channels
Table B-6 Data Registers
Register
Data Type
Description
Summary of Contents for RLPC 0.1m
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