Lighthouse SOLAIR 3350, Operating Manual, Page: 170 / 184

Lighthouse SOLAIR 3350, 5350 Gen E Operating Manual
B-16 248083387-1 Rev 10
Enable Alarming for a Channel
To enable alarming on the third particle channel, the user would enable
Bit 1 for register 43014.
To disable alarming on the third channel and enable alarming on the
second channel, disable Bit 1 for register 43014 and enable Bit 1 for
register 43012.
To disable alarming completely, disable Bit 1 for register 43012. Now,
no channels are enabled for alarms.
Use the Threshold registers to set the alarm threshold value. This is
described in the next section.
Threshold Setup Registers
Threshold data is stored in the input registers in the 45xxx series which
are read/write. All threshold data items are 4 bytes long and are stored
across 2 registers. Byte and word ordering is big-endian. Thus, data
items are formed by placing the high bytes in front of the low bytes.
For example:
<High Bytes><Low Bytes> = <4 Byte Data Item>
For particle channels, the threshold value is a 32-bit unsigned integer.
If the data value exceeds the threshold value and the alarm is enabled
for that channel, the threshold flag in the Data Status register (30007-
30008, bit 4) is set.
Table B-15 Example of Alarming on Channel 2
Registers
Particle
Channel
Bit 1
Enabled
43009 - 43010 1 0
43011 - 43012 2 1
43013 - 43014 3 0
43015 - 43016 4 0
43017 - 43018 5 0
43019 - 43020 6 0
43021 - 43022 7 0
43023 - 43024 8 0