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!
.
B.1.9 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.
B.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 Tools list in
PC400
or the Datalogger list
in the Connect screen of
LoggerNet
.
Watch
videos/sdi12-sensors-transparent-mode
from our website.
Data loggers from other manufacturers will also have a transparent mode. Refer to those
manuals on how to use their transparent mode.
The following examples show how to enter transparent mode and change the SDI-12 address of
an SDI-12 sensor. The steps shown in
(p. 22) are used with most
Campbell Scientific data loggers.
B.2.1 Changing an SDI-12 address
This example was done with a CR1000X, but the steps are only slightly different for CR6, CR3000,
CR800-series, CR300-series, CR1000 data loggers.
CS225 Temperature String
22
