Personal Ozone Monitor Manual Rev. E-2
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7.
QUIET MODE
The POM
firmware allows the user to select a “quiet mode” where the pump will be
throttled down to decrease the high pitch frequency sound output. This can be done
one of two ways. The user can press and hold the Select button while powering on
the POM to display
Pump Mode
Quiet Fast
w
here the user can select “
Quiet
,
” which will slow the pump down and change the
instrument flush cycle time from 2 seconds to 4 seconds. This setting will also change
the 10 second averaging time to 20 seconds.
Restarting the instrument and c
hanging back to “
Fast
” will reset the flush time to 2
seconds. Another way to change the pump mode is through the serial menu as
described in the next section.
8.
SERIAL AND USB MENU
Measurements and logging tasks can be accessed via the serial port or the USB using
the 2B Technologies Data Display software (see Appendix A) or a terminal emulator
such as Tera Term or HyperTerminal running on an attached computer. Commands
can be sent using the terminal emulator set with the properties listed in the section of
this manual entitled “Collecting Data over the USB Port or Serial Port in Real Time”
(Section 3.4). Listed below are the lower-case letters that are commands for
performing certain operations while the instrument continues to measure:
l
Start logging and write over existing logged data
t
Transmit logged data
e
End logging
h
Output serial data line header
n
Output serial number of the instrument
m
Serial menu
If the letter
m
is sent as a command,
menu>
will be displayed in the terminal emulator
window. When the serial menu is accessed, the instrument is no longer making
measurements; it is waiting for the next command to be entered. The next page
shows the list of menu items accessible from this point:
