Vaisala PTB330 - Manual (Page 142)

USER'S GUIDE____________________________________________________________________
140 _________________________________________________________________ M210855EN-D
PA11A Message Format
Message type 1 format is as follows:
<sp>P1<sp>P2<sp>P3<sp>status<sp>average<sp>trend<cr><lf>
where:
<sp> = Space character
P1 = Pressure output from transducer 1 (in 0.1 hPa). The
reading is written with 5 characters.
If the transducer has a fault or has been switched off, the
reading is replaced with error status /////.
P2 = Pressure output from transducer 2, same format as P1
P3 = Pressure output from transducer 3, same format as P1
status = Status of the average pressure measurement (binary,
with 8 characters). 10000000 means OK with all three
transducers included. Otherwise, the last three bits of the
status indicate the transducers that are included when
calculating the average. For example, status 00000110
means that transducers 2 and 3 are included and
transducer 1 is ignored.
average = Average pressure (with 5 characters) based on three
consequent measurements of each transducer included,
i.e. pressure average over approx. one minute.
If the average pressure cannot be calculated, the reading
is replaced with error status /////.
trend = Three hour pressure trend (with 3 characters). Falling
trend is indicated with a minus "-" character before the
reading. If the data is not available (when measurement
has been running for less than three hours), the reading
is replaced with ///.
<cr><lf> = Carriage return and line feed characters
NOTE All pressure readings are in 0.1 hPa. The pressure unit selection has
no effect.
If a reading is shorter than the amount of characters reserved for it, it
is left-padded with space characters. See the examples below.