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 Examples of aM,
aC and aD Commands on page 108.
! = Command terminator
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