Xylem H-335 - Manual (Page 24)

2-8 SDI-12 Command and Response Protocol H-335
Example of a H-335 "aI!" command:
"a12 DAA H-335vvvS#nnnnnnVkkk"
H-335 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
2.8 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.