World Patents Pending ©AirSense Technology Ltd. 1999
ISSUE 2.4
Page 46
TECHNICAL. MANUAL
Refer to “Programming Function 47” for more information on this setting. The chart
recorder display automatically adjusts the time display for different sample rates.
action command
select detector d 0x44 0x7f + d (uppercase D character)
read function f value 0x52 0x7f + f (uppercase R character)
write function f with value v 0x57 0x7f + f 0x7f +v (uppercase W character)
Chart recorder
sample rates
n For a selected sampling period the highest reading taken during that period is
stored.
n For a multiple detector system all detectors have their readings stored. The
maximum duration is divided by the number of detectors.
n Changing the sample rate will clear the data in the chart log
NB
+
Setting Sampling period Maximum duration
(time between samples) (hours)
0 no sampling 0
1 10 second 5
2 3 minute 9
3 10 minute 30 1.2 days
4 50 minute 150 6.2 days
5 200 minute 600 25 days
The following strings allow programming of the functions. These commands are
preceded by ‘>’ (0x3e). The command string should be terminated with a CR
character (0x0d). Note that to prevent the command string being terminated by a
0x0d in the command being interpreted as end of string all binary parameter values
have 0x7f (127 decimal) added to them. Invalid values for detector, function or value
are ignored.
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