Figure 11
Wiring of the SPA-2 with a data logger via SDI-12
11.4.4 How do I configure it?
The SPA-2 has SDI-12 communication enabled by default. If the device is connected to a data acquis-
ition system, e.g. data logger, and if multiple SDI-12 devices are connected to the same bus, the
may need to be adapted.
11.4.5 How are commands structured?
A standard SDI-12 command starts with the sensor address and ends with an exclamation mark,
e.g.,
0M!
.
The answer from the SDI-12 device is a string containing the sensor address, the requested data
and a terminating carriage return/line feed, e.g.,
EXAMPLE
0+2591+706+25.53+0<CR><LF>
11.4.6 Which commands are available?
The following tasks can be performed with standard and extended SDI-12 commands.
Extended SDI-12 commands are non-standard commands implemented by SOMMER to enable
device configuration via SDI-12.
NOTE
After any changes, the settings have to be adopted with the com-
mand
aXW_ts|!
, with
a
the sensor address.
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