Lighthouse Remote 3014PN, Operating Manual

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Lighthouse REMOTE-4PN Series Operating Manual
B-8 248083317-1 Rev 4
Note:
Particle data is 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.
Device Status Word
Note:
Although
MODBUS sends 4 bytes of
status information,
Lighthouse instruments
only use the first (least
significant) byte.
The registers used for the Device Status Word are 30007 and 30008.
The bit order of the Device Status Word is 7 to 0 (right to left), where
bit 7 is the most significant bit and bit 0 is the least significant bit.
The bits within the Device Status Word 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
30008 (bits 1 and 2 are set TRUE).
30067 IEEE Float Flow Value [low] - 0.0 if flow is
below reference, 1.0 if flow is at
reference, 1.1 if flow is above
reference
30068 IEEE Float Flow Value [high]
30069 IEEE Float Laser Voltage [low] - percentage
based on Laser Reference Voltage
30070 IEEE Float Laser Voltage [high]
Table B-6 Data Registers
Register Data Type Description
Table B-7 Device Status Word
Bit Description
0 Laser Alert Status
0 = Laser is good 1 = Laser Alert
1 Flow Alert Status
0 = Flow Rate is good 1 = Flow Rate Alert
2 Particle Overflow Status
0 = No overflow 1 = Overflow occurred