Table 35 Communication Problems
Problem Possible causes Action(s)
No response to any
commands.
W
rong wiring or operation voltage not
connected. Baud rate/start bits/parity/
stop bit settings do not match between
the device and the host.
Check the wiring and operation
voltage. See 5. Wiring and Power
Management (page 53).Connect the
service cable, use the communication
settings 19200,8 N,1. Check the serial
port settings of the device with
Configuration Tool or with terminal
program. Use command aXU! (SDI-12)
or aXU<cr><lf> (ASCII/NMEA).
Change the values if needed. A
software/hardware reset is needed to
validate the changes. When you have
no service cable, try typing address
query commands ?! and ?<cr><lf>
with dierent serial settings in
terminal pr
ogram. When the
communication parameters match, the
device responds with its address. The
settings can now be changed using
aXU! (SDI-12) or aXU<cr><lf>
(ASCII/NMEA) commands. A
software/hardware reset is needed to
validate the changes.
Incorrect <cr><lf> settings in the
terminal program.
In ASCII and NMEA protocols both
<cr> and <lf> are required after each
command. Check that your terminal
program sends both when pressing
enter.
Connection works but data
messages not a
vailable.
Wrong device address in a SDI-12
command or a mistyped SDI-12
command (in SDI-12 a mistyped
command is in no way responded). A
command mistyped in ASCII/NMEA
mode while error messaging/text
messages is disabled (aSU,S=N).
Request the device address with ?!
command and then retype the
command now with the correct
address. Check the data query
commands. See 7. Retrieving Data
Messages (page 77). Enable the error
messaging using the Vaisala
Configuration Tool or any terminal by
setting aSU,S=Y, then try the
command again.
Data messages are not in
expec
ted format.
The communication protocol may not
be the one you want.
Check the communication protocol of
the device by using the Vaisala
Configuration Tool or any terminal
with command aXU,M! (SDI-12)
aXU,M<cr><lf> (ASCII/NMEA) and
change it if needed.
Some parameters are
missing from the data
messages.
The formatting of the data messages is
not what you expect.
Format the data messages of the
concern by using the Vaisala
Configuration Tool or any terminal
program.
An error message as a
response t
o a command.
See 10.1.1 Error Messaging/Text
Messages (page 153) .
See 10.1.1 Error Messaging/Text
Messages (page 153).
WXT530 Series User Guide M211840EN-D
152
sales@streamlinemeasurement.co.uk
www.streamlinemeasurement.co.uk
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