Xylem H-335 - Manual (Page 28)

2-12 SDI-12 Command and Response Protocol H-335
2.12 Extended “XTEST” and “XRAW” Commands
These commands are used for installation or production testing and requires the use of a H-419
Sidekick interface and a PC. These commands causes the H-335 to transmit unsolicited real-time
data for testing purposes. This is not compliant with the SDI-12 specification and is not used with
data loggers.
To activate the test mode, first send the command “aXTEST!” or “aXRAW” from the PC. The H-
335 will automatically display a new line of data about once per second. This test mode may be used
to help troubleshoot the installation by providing a continuous readout of sensor data. The test mode
is exited by sending any new command on the SDI-12 bus (a BREAK terminates the test). It may
take a few tries to exit if the command is sent at the same time data is being sent from the H-335.
Removing power from the H-335 also causes it to exit this mode.
“aXTEST” displays the following data:
a (sensor address)
SensorAngle (degrees)
Example of the XTEST test display:
a +1.200
a +1.500
a +1.700
a +1.900
etc.
“aXRAW” displays the following data:
a (sensor address)
Gate Arc Length (feet, meters etc.)
Gate Height (feet, meters etc.)
User Angle (degrees)
Sensor Angle (degrees)
Raw Positive A/D count (±8192)
Raw Negative A/D count (±8192)
Raw Positive - Negative A/D count (±16384)
Sensor Temperature. ( C)
Example of the “XRAW” test display:
a +1.200 +.1.103 +4.565 -32.231 -2639 +5836 +8475 +23.52
a +1.500 +.1.213 +5.183 -31.613 -2234 +5835 +8069 +23.51
a +1.700 +.1.451 +5.397 -31.399 -2656 +5848 +8504 +23.54
a +1.900 +.1.602 +5.565 -31.231 -2678 +5786 +8464 +24.03