Xylem H-339 - Manual (Page 19)

H-339
SDI-12 Command and Response Protocol 2-7
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
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"a!" "a"
Where: a Is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
Change Sensor Address
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-339 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.
A is an upper-case ASCII character.
n is the new sensor address to be programmed ("0-9", "A-Z", "a-z", "*", "?").
NOTE: To verify the new address use the "Identify Command."