Section 7. Installation
174
• Programmed mode automates much of the SDI-12 protocol and provides for
data recording.
7.8.3.1 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.
Transparent mode may need to wait for commands issued by the programmed
mode to finish before sending responses. While in transparent mode, CR800
programs may not execute. CR800 security may need to be unlocked before
transparent mode can be activated.
Transparent mode is entered while the PC is in telecommunications with the
CR800 through a terminal emulator program. It is easily accessed through
Campbell Scientific datalogger support software
(p. 76), but may also be accessible
with terminal emulator programs such as Windows Hyperterminal. Keyboard
displays cannot be used.
To enter the SDI-12 transparent mode, enter the datalogger support software
terminal emulator as shown in figure Entering SDI-12 Transparent Mode
(p. 174).
Press Enter until the CR800 responds with the prompt CR800>. Type SDI12 at
the prompt and press Enter. In response, the query Enter Cx Port 1 or 3 will
appear. Enter the control port integer, that is 1 to 4, to which the SDI-12 sensor is
connected. An Entering SDI12 Terminal response indicates that SDI-12
transparent mode is active and ready to transmit SDI-12 commands and display
responses.
Figure 57: Entering SDI-12 transparent mode
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