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Operation
4.2.2.2 Ethernet LED indicators
4.2.3 Pulse output modes
1
Pulse signal sent from counter
2
Data transfer in differential vs. cumulative mode
3
Channel 2
36
Refer to
Table 10
for a description of the Ethernet connection LED indicators.
Table 10 LED indicators for Ethernet
LED color
Yellow
Green
Green
The pulse unit sends an 8-µs signal each time a particle is detected. A data acquisition
system installed by the user and connected to an output channel counts the pulses. The
data can be sent in one of 2 count modes—differential or cumulative
•
Differential mode—a signal is sent on the first channel when a particle is between
the first and the second size thresholds. A signal is sent on the second channel when
a particle is larger than the second size threshold.
•
Cumulative mode—a signal is sent on the first channel when a particle is larger than
the first or the second size threshold. A signal is sent on the second channel when a
particle is larger than the second size threshold.
Note: The count mode can be configured by the factory. The default setting is differential. Pulse
units cannot be networked.
Figure 25 Differential vs. cumulative count mode example
On/Off
On
Off
On
4
Channel 1
5
Differential count—one 0.2 µm and two 5.0 µm particles
6
Cumulative count—three 0.2 µm and two 5.0 µm particles
Indicator
Connected
10Base-T
100Base-T
(Figure
25).
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