Vaisala PTB330 Manuel d'utilisateur télécharger pdf (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.

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Vaisala PTB330 Manuel d'utilisateur Page 142