Xylem H-3311 - Manual (Page 19)

The “Change Sensor Address” command allows the sensor address to be changed. The address is
stored in non-volatile EEPROM within the sensor. The H-3301/3311 will not respond if the
command was invalid, the address was out of range, or the EEPROM programming operation
failed.
Command Response Description
“aAn!” “n” Change sensor address
Where:
a is the current (old) sensor address (“0-9”, “A-Z”, “a-z”, “*”, “?”). An ASCII “*” may be used
as a “wild card” address if the current address is unknown and only one
sensor is connected to the bus.
17
SDI-12 Command & Response Protocol
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 1.3 is represented as “13”.
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 an "aI!" command:
"a12 DAAH-3301vvvS#nnnnnnVkkk"
H-3311 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
Change Sensor Address