Vaisala WXT520 - Manual (Page 85)

Chapter 7 __________________________________________________ Getting the Data Messages
VAISALA_______________________________________________________________________ 83
Send Identification Command (aI)
This command is used to query the device for the SDI-12 compatibility
level, model number, and firmware version and serial number.
Command format: aI!
The response:
a13ccccccccmmmmmmvvvxxxxxxxx<cr><lf>
Example:
0I!013VAISALA_WXT520103Y2630000<cr><lf>
Start Measurement Command (aM)
This command asks the device to make a measurement. The measured
data are not sent automatically and should be requested with a separate
Send data command aD.
where
a
= Device address
I = Send identification command
! = Command terminator
where
a
= Device address
13 = The SDI-12 version number, indicating SDI-12
version compatibility; for example, version 1.3 is
encoded as 13
cccccccc = 8-character vendor identification Vaisala_
mmmmmm = 6 characters specifying the sensor model number
vvv = 3 characters specifying the firmware version
xxxxxxxx = 8-character serial number
<cr><lf> = Response terminator