Lighthouse HANDHELD 2016, 3016, 5016 Gen F Operating Manual
C-14
248083400-1 Rev 7
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.
Device Status Word (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 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).
Bits 7 to 31 are currently unused.
Table C-12 Device Status Word
Bit Description
0 Laser Alert Status
0 = Laser is OK 1 = Laser Alert
1 Flow Alert Status
0 = Flow Rate is OK 1 = Flow Rate Alert
2 Particle Overflow Status
0 = No overflow 1 = Overflow occurred
3 Instrument Service Status
0 = Working correctly 1 = Instrument malfunction detected.
4 Threshold High Status
0 = Threshold not exceeded 1 = Threshold exceeded
5 Threshold Low Status
0 = Threshold not exceeded 1 = Threshold exceeded
6 Instrument Sampler Status
0 = Nominal Operation 1 = Sampler Error
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