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H-424ms – Xylem H-424MS V1.1 User Manual

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Example of a H-424MS "aV!" command:

Command

Response

Time Values

Description

-------------

---------------------

------- --------

---------------------------

"aV!"

"a0013"

1 sec

3

Return fixed data and diagnostic
data for testing purposes.

Subsequent Command

Response

---------------------------

--------------------------------------------

"aD0"

a+123.456+78.9+y

Key

Description

Units

-------------

-------------------------

----------------------------

+123.456

Fixed test data

+78.9

Fixed test data

y

ROM checksum test

0 = Failed, 1 = Passed

2.4 Initiate Verify Command

The Verify Command causes a verify sequence to be performed. The result of this command is
similar to the "aM!" command except that the values generated are fixed test data and the results
of diagnostic checksum tests. The data generated in response to this command is placed in the
sensor's buffer for subsequent collection using "D" commands. The data will be retained in the
sensor until another “M”, “C” or “V” command is executed.

Command

Response

Description

-------------

-------------------------

---------------------------

"aV!"

"atttn"

Initiate verify sequence

Where:

a

is the sensor address ("0-9", "A-Z", "a-z", "*", "?").

V

is an upper-case ASCII character.

ttt

is a three digit integer (000-999) specifying the maximum time, in
seconds, the sensor will take to complete the command and have data
available in its buffer.

n

is a single digit integer (0-9) specifying the number of values that will be
placed in the data buffer. If "n" is zero (0), no data will be available using
subsequent "D" commands

2-4 SDI-12 Command and Response Protocol

H-424MS