Xylem H-3311 - Manual (Page 13)

11
SDI-12 Command & Response Protocol
Command Description
aM! Make Measurement
aMC! Make Measurement with CRC
aC! Make Concurrent Measurement
aCC! Make Concurrent Measurement with CRC
aD0! Send Data
aR0! Make Continuous Measurement
aRC0! Make Continuous Measurement with CRC
aV! Verify Sensor
aAn! Change Sensor Address
al! Send Identification
a! Send Acknowledge
Standard SDI-12 Commands
Command Description
aXHELP! Print a Command Listing
aXRS! Read Slope
aXWSddd! Write Slope
aXRO! Read Offset
aXWOddd! Write Offset
aXZ! Zero the Position
aXTD! Run a Check on the Display
aXSDddd! Output a Specific Value to the Display
aXTEST! Initiate a Repeating Test Printout
Extended SDI-12 Commands Unique to the H-3301/3311
The “Measure” command causes a measurement sequence to be performed. Data values generated
in response to this command are stored in the sensor’s buffer for subsequent collection using “D”
commands. The data will be retained in the sensor until another “M”, “C” or “V” command is
executed.
Command Response Description
“aM!” “atttn” Initiate measurement
Where:
a is the sensor address (“0-9”, “A-Z”, “a-z”, “*”, “?”).
M is an upper-case ASCII character
Measure Command