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H-312 – Xylem H-312-22 User Manual

Page 29

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H-312

SDI-12 Command and Response Protocol 4-9

4.9 Extended Set_Current_Stage Command
The H-312 processes the pressure sensor input and computes Pressure in PSI units. Stage is
computed with a Stage = m * Pressure + b equation. During installation it is convenient to quickly
set the H-312'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-312 to make a fresh measurement and
automatically update the Offset (b) term as needed to produce the desired Stage.

Example of a H-312 Extended "Set Current Stage" command:

Command

Response

Time

Values Description

"aXSCS2.3!"

"a0031"

3 sec

1

Set the Stage to 2.3

Subsequent Command

Response

Description

"aD0"

a+12.80

The new Offset

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