Vaisala WMT700 - Manual (Page 68)

TECHNICAL REFERENCE___________________________________________________________
66 __________________________________________________________________ M211097EN-C
The response is the following:
atttnn<CR><LF>
where
a
= The single-digit WMT700 address that corresponds to
the first character of the address value.
ttt = The period of time, in seconds, after which WMT700
has the measurement ready.
nn = The number of measurement values WMT700
calculates and returns as a response to one or more
subsequent aD0! commands.
<CR><LF> = Terminates the response.
Example of the command and response:
1C!
100205<CR><LF>
Interpretation of the example message:
- Time after which the measurement is ready: 2 seconds
- Number of returned measurement values: 5
To fetch the measurement results, use the aD0! command.
aD0! — Send Data
This command fetches instant data from WMT700. aD0! must be
preceded by a C!, M!, or V! command.. WMT700 responds by sending
measurement data (after C! or M!) or verification data (after V!).
In a SDI-12 system compliant with the standard, if the expected number
of measurements is not returned in response to an aD0! command, a data
recorder issues D1!, D2!, and so on, until all measurement values are
received. The expected number of measurements is included in the
message that WMT700 sends in response to an aC!, aM! or aV!
command. Multiple data requests are not needed with WMT700, since all
return values fit easily into one response string.