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7.3.5 Start Measurement Command (aM)
This command asks the device to make a measurement. The measured data is not sent
automa
tically. You must request it with the Send data command aD.
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 many devices are needed, use start concurrent measurement aC or start concurrent
measurement with CRC aCC.
Command format:
aMx!
a
Device address
M
Start measurement command
x
The desired sensor to make the measurement
1 = Wind
2 = Temperature, humidity, pressure
3 = Precipitation
4 = Analog input
5 = Supervisor
If x is left out, the query refers to the combined data message used for requesting
da
ta fr
om several sensors with one command.
!
Command terminator
For analog input measurements, the measurement completing time is the bigger one of
the aUI,A and aIP,A values (a
veraging times for solar radiation, ultrasonic level sensor
and Aux.temperature).
The response is sent in two parts.
P
art one:
atttn<cr><lf>
WXT530 Series User Guide M211840EN-D
94
sales@streamlinemeasurement.co.uk
www.streamlinemeasurement.co.uk
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