characters of data in response to a
D
command that follows an
M!
or
MC!
command. A sensor
may return up to 75 characters of data in response to a
D
command that follows a
C!
or
CC!
command. Data values are separated by plus or minus signs.
Command:
aD0!
(
aD1!
…
aD9!
)
Response:
a<values><CR><LF>
or
a<values><CRC><CR><LF>
where:
a
= the sensor address
<values>
= values returned with a polarity sign (+ or –)
<CR><LF>
= terminates the response
<CRC>
= 16-bit CRC code appended if data was requested with a
MC!
or
aCC!
.
C.1.11 Continuous measurement command (aR0! … aR9!)
Sensors that are able to continuously monitor the phenomena to be measured can be read
directly with the
R
commands (
R0!
…
R9!
). The response to the
R
commands mirrors the Send
Data command (
aD0!
). A maximum of 75 characters can be returned in the
<values>
part of the
response to the
R
command.
C.2 SDI-12 transparent mode
System operators can manually interrogate and enter settings in probes using transparent mode.
Transparent mode is useful in troubleshooting SDI-12 systems because it allows direct
communication with probes. Data logger security may need to be unlocked before activating the
transparent mode.
Transparent mode is entered while the computer is communicating with the data logger through
a terminal emulator program. It is accessed through Campbell Scientific data logger support
software or other terminal emulator programs. Data logger keyboards and displays cannot be
used.
The terminal emulator is accessed by navigating to the Datalogger list in PC200W, the Tools list
in PC400, or the Datalogger list in the Connect screen of LoggerNet.
Watch the video:
SDI-12 Sensors | Transparent Mode
Data loggers from other manufacturers will also have a transparent mode. Refer to those manuals
on how to use their transparent mode.
WindSonic4 Two-Dimensional Sonic Anemometer
25