Xylem H-4191 - Manual (Page 18)

2-8 SDI-12 Command and Response Protocol
H-4191
2.8 Change Sensor Address Command
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-4191 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<cr><lf>" 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.
A is an upper-case ASCII character.
n is the new sensor address to be programmed ("0-9", "A-Z").
NOTE: To verify the new address use the "Identify Command."
Example of a "Change Sensor Address" command:
Command Response Description
"ZA9!" "9<cr><lf>" Change sensor address to "9"