Xylem H-3342 - Manual (Page 28)

3-16 SDI-12 Command and Response Protocol
H-3342
3.16 Extended “XTEST”
This command is used for installation or production testing and requires the use of a H-4191 RS-
232 to SDI-12 interface and a PC. This command causes the H-3342 to transmit unsolicited real-
time data for testing purposes. The test mode is used to help troubleshoot the installation by
providing a continuous readout of shaft position. This is not compliant with the SDI-12
specification and is not used with data loggers.
To activate the test mode, send the command “aXTEST!” from the PC. The H-3342 will enter
the test mode and automatically display 3 new measurements per second. The test mode is
exited by sending a break or any new command on the SDI-12 bus. It may take a few tries to exit
if the command is sent at the same time data is being sent from the H-3342. Removing power
from the H-3342 also causes it to exit this mode.
Format= SensorAddress+Stage+RawShaftPosition+EncoderStatus
“aXTEST” displays the following data:
a +1.202 +3.222 +0
a +1.212 +3.232 +0
a +1.222 +3.342 +0
a +1.232 +3.352 +0
a +1.232 +3.352 +0
etc.