Xylem H-4191 - Manual (Page 17)

H-4191
SDI-12 Command and Response Protocol 2-7
2.7 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.
Example of a "aI!" command:
"a12 DAA H-4191vvvS#nnnnnnVkkk "
H-4191 implementation of the optional 13 character field:
S#nnnnnnVkkk (12 bytes total)
Where:
"nnnnnn" is a six character sensor serial number
"kkk" is a three digit sensor firmware revision level