-4-
4.
DATA LOGGING
The HHM can be used as a data logger to record air
quality and later dump it into your PC.
To enter data logging mode use the up/down arrow
key while in the SELECT FUNCTION screen until
you get the following display
SELECT FUNCTION
LOG flashing
Press ENTER.
The display now reads
YYMMDDHHMM SET TIME
9 9 9 9 9 9 9 9 9 9
where 9999999999 is the current date and time
Use the up arrow key to move the cursor and the
numeric keypad to change the values. Press enter to
accept the displayed value.
The display now reads
5 s flashing
Toggle through the available choices with the up/
down arrow key. Press enter when your choice is
displayed. THE HHM can log for 12 hours at 1
minute intervals or 4 weeks at 60 minute intervals.
The display will read:
SET LOG OPTION
0 flashing
Press ENTER, this option is only used for factory
setup.
BEGIN LOGGING NOW?
PRESS ENTER TO BEGIN flashing
When you press ENTER
The display will read :
LOGGING: . TO STOP
99999
The HHM is logging data. To stop data logging
press the period key. 99999 is a number between 0
and 32000. This number is a measure of air quality.
The larger the number the better the air quality. You
may find it useful to look at this number to see
instantaneous changes in air quality.
5.
TRANSFERRING DATA to a PC or MAC
If you want to do this you will need the required
connector and communications software.
1. We offer a relatively user friendly software
package that runs under Windows 3.1 on a PC or
Soft Windows on a MAC. It can read data from the
handheld module while connected to the computer’s
serial port. Once the data is read the program
automatically scales the data, displays a graph on the
screen and allows you to save and/or print it. This is
a very simple and effective way to quickly view
trends in air quality over a time period. For more
complex analysis of the data you can save the data
and use your spread sheet program for analysis.
SERIAL COMMUNICATIONS
If you have purchased the AQT-SERIAL-KIT you
will have a cable with power supply to connect the
HHM-AQ to a COM port of your your PC. You will
also have a floppy diskette with software to read and
graph the data you have logged with the HHM-AQ.
Before using the communications program ensure
that
the COM port you want to use is working properly
under
Windows. Use a communications program such as
the
Windows TERMINAL (or XTALK, PROCOMM
etc.) to verify
that you can properly 'DUMP' the data to the PC.
Set the communications port to ...
8 data bits
1 stop bit
n no parity
9600 baud
Use COM 1,2,3 or 4 (usually 1 and 2 have interrupt
capability
and often COM 1 is used by the Mouse, it is
recommended to use
COM 2 if available)
The sample DUMP data should look like this...
DUMP 96/03/28 20:06 @ 5s
AIRQ, TEMP, HUM, OUT.
25023 09246 22985 00043
25047 09246 22985 00043
25067 09247 22986 00043
25094 09248 22987 00043
25105 09247 22989 00043
25119 09247 22990 00043
25129 09247 22992 00042
25141 09246 22993 00042
25153 09246 22994 00042
To enter down loading mode use the up/down
arrow key while in the SELECT FUNCTION screen
until you get the following display
SELECT FUNCTION
