Xylem H-424MS V1.1 - Manual (Page 17)

2.5 Send Acknowledge Command
The Send Acknowledge Command returns a simple status response which includes the address of
the sensor. Any measurement data in the sensor's buffer is not disturbed.
Command Response
------------- -------------------------
"a!" "a"
Where:
a Is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
2.6 Send Identification Command
The Send Identification command responds with sensor vendor, model, and version data. Any
measurement data in the sensor's buffer is not disturbed.
Command Response
------------- ------------------------------------------------------------
"aI!" "allccccccccmmmmmmvvvxx...xx"
Where:
a is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
I is an upper-case ASCII character.
ll is the SDI-12 version compatibility level, e.g. version 1.2 is represented as
"12".
cccccccc is an 8 character vendor identification to be specified by the vendor and
usually in the form of a company name or its abbreviation.
mmmmmm is a 6 character field specifying the sensor model number.
vvv is a 3 character field specifying the sensor version number.
xx...xx is an optional field of up to a maximum of 13 characters to be used for
serial number or other specific sensor information not relevant to operation
of the data recorder.
H-424MS
SDI-12 Command and Response Protocol 2-5