19 OTT-SDI Transparent mode
For maintenance or calibration operations on a sensor with SDI-12 interface,
the OTT netDL unit has a so-called "Transparent mode". Using a mode in the
operating program that is similar to terminal emulation, it is possible
to directly communicate with the sensor via the OTT netDL. For this purpose, vari-
ous SDI-12 commands are available. In this case, the OTT netDL transfers the
commands to the sensor, activates it, and returns the responses of the sensor to the
terminal window.
Further information on the available commands of an SDI-12 sensor can be found
in the operating instructions of the sensor.
Alternatively, the "OTT SDI-12 Interface" software is available. Using this soft-
ware, you may send SDI-12 commands to a sensor fitted with an SDI-12 interface
in a very convenient manner. The software clearly displays the response in plain
text the sensor sends upon receiving an SDI-12 command.
How to use the OTT-SDI Transparent mode:
Establish the PC/OTT netDL communication link (refer to Chapter 8.2)
Start the terminal emulation: In the "netDL 500/1000" menu, select the
"Terminal mode" option.
Wake the OTT netDL unit up: A<Enter key> (several times, if required). Return
value:
?08
Start the OTT-SDI Transparent Mode: CL/SDI/TRANSP<Enter>
(sensor is connected to screw terminal strip C, terminals 3/4) or
CL/OTTS-
DI/TRANSP<Enter> (sensor is connected to screw terminal strip C, terminal
1/2) ➝ command prompt for SDI-12 commands appears: SDI-12>
Gewünschtes SDI-12-Kommando eingeben (omit the ! Character at the end of
an SDI-12 command, it will be automatically added by the operating program).
The sensor will return an appropriate response.
OTT-SDI Transparent mode : quit<Enter>.
Exit terminal mode: Press ESC key.
Please note:
Note case sensitivity.
Upon incorrect entries, the sensor returns an < Error > .
If communication is faulty, end terminal mode (ESC button), wait 5 seconds,
then restart terminal mode.
If the OTT netDL is in measuring mode (e.g. the sample interval of a sensor is
active), the response from the sensor is delayed.
Fig. 32: Terminal emulation (terminal
mode) in the operating program with
two exemplary commands used in
OTT-SDI Transparent mode.
48
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