Vaisala PTB220 - Manual (Page 19)

C HAPTER 4_____________________________________________________________ COMMISSIONING
V AISALA _________________________________________________________________________ 13
NOTE Remember to give the RESET command to initialize the new sending
mode.
MMODE Selecting the measurement mode
MMODE x
where:
x = NORMAL or FAST
The MMODE command is used to set or inspect the measurement
mode of the barometer. In the normal measurement mode, the
barometer measures the capacitance of each of the five capacitive
components of the pressure transducer (see page 6). This is the
standard operating mode of the PTB220 series digital barometers.
In the fast measurement mode, the barometer measures mainly the
capacitance of the BAROCAP

pressure sensor and results in a faster
measurement speed (approximately 10 measurements per second).
This measurement mode can be used only with the barometers having
one pressure transducer and full duplex communication.
MMODE selection is protected by switch SW4 (see F IGURE 4-1 ). The
switch SW4 is normally in DISABLE position (OFF). Turn the switch
to ENABLE position (ON) to be able to make a new MMODE
selection.
ON
OFF
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
S1
F IGURE 4-1 Switch SW4 in ENABLE position (ON)
Example of selecting the fast measurement mode:
>mmode
Meas mode
: NORMAL
>mmode fast
Meas mode
: FAST
>mtim 32