Chapter 7 ___________________________________________________ Retrieving Data Messages
VAISALA______________________________________________________________________ 107
Start Concurrent Measurement with
CRC (aCC)
Command format:
aCCx!
Use this command when there are several devices on the same bus and
simultaneous measurements are needed from the devices but a three-
character CRC is added to the response data strings before <cr><lf>.
To request the measured data, use the Send data command
aD
.
Send Data Command (aD)
Use this command to request the measured data from the device. See
Examples of aM, aC and aD Commands on page 108
.
Command format:
aDx!
NOTE
Start measurement command indicates the number of parameters
available.
The number of the parameters that can be included in a single message
depends on the number of characters in the data fields. If not all the
parameters are retrieved in a single response message, repeat the Send
data commands until all the data is obtained.
where
a
=
Device address
D
=
Send data command
x
=
The order of consecutive Send data commands.
Make sure the first Send data command is addressed
with x=0. If all the parameters are not retrieved, send
the next Send data command with x=1 and so on.
The maximum value for x is 9. See
aC and aD Commands on page 108
!
=
Command terminator
