Xylem H-3342 - Manual (Page 22)

3-10 SDI-12 Command and Response Protocol
H-3342
3.9 Extended Set_Stage
This command is used for convenience in testing the 4-20mA output. This command allows the
user to temporarily force the Stage to a test value. For example, the user can force the shaft
position (Stage) to several different values while calibrating or monitoring the attached 4-20mA
instrumentation. Once a fresh measurement is made via a SDI-12 measurement or by pressing
the “Read” button, the temporary Stage data is overridden.
Example of a H-3342 Extended "Set Stage" command:
Command Response Time Values Description
"aXS2.3!" Set the Stage to 2.3
3.10 Extended Set_Current_Stage
The H-3342 processes the raw shaft position with a Stage = mX+b equation. During installation
it is convenient to quickly set the H-3342's Stage reading to match the current stage or elevation
of the water as determined by a staff gauge or other datum. This command causes the H-3342 to
make a fresh measurement and automatically update the Offset (b) term as needed to produce the
desired Stage.
Example of a H-3342 Extended "Set Current Stage" command:
Command Response Time Values Description
"aXSCS2.3!" "a0021" 2 sec 1 Set the Stage to 2.3
Subsequent Command Response Description
"aD0" a+12.80 The new Offset