Vaisala WXT520 User Manual
Page 86
User’s Guide ______________________________________________________________________
84 __________________________________________________________________ M210906EN-C
The host device is not allowed to send any commands to other devices
on the bus until the measurement is completed. When several devices
are connected to the same bus and simultaneous measurements from the
different devices are needed, Start concurrent measurement aC or Start
concurrent measurement with CRC aCC should be used, see the next
sections.
Examples of aM, aC and aD Commands on page 88
Command format: aMx!
The response is sent in two parts:
The response part one:
atttn
The response part two (indicates that the data is ready to be requested):
a
where
a
=
Device address
M
=
Start measurement command
x
=
The desired sensor to make the measurement
1 = Wind
2 = Temperature, humidity, pressure
3 = Precipitation
5 = Supervisor
If x is left out, the query refers to the combined data
message used for requesting data from several
sensors with just one command. See
aM, aC and aD Commands on page 88
.
!
=
Command terminator
where
a
=
Device address
ttt
=
The measurement completing time in seconds
n
=
The number of the measured parameters available
(maximum number is 9)
=
Response terminator