Table 7-1: Wire color, function, and data logger connection
Wire color
Wire function
Data logger or RTU terminal
White
SDI-12 signal
SDI-12 Data, C, SDI-12,
or U configured for SDI-12
1
Clear
Shield
⏚
(analog ground)
Red
Power
12V
Black
Power ground
G
1
U and C terminals are automatically configured by the measurement instruction for Campbell Scientific CR6 data
logger.
Campbell Scientific recommends using separate terminals when possible. However, multiple SDI-
12 sensors can be connected to a single data logger control or U terminal. Each SDI-12 device
must have a unique SDI-12 address.
For the CR6 and CR1000X Campbell Scientific data loggers, triggering conflicts may occur when a
companion terminal is used for a triggering instruction such as
TimerInput()
,
PulseCount()
,
or
WaitDigTrig()
. For example, if the CS475A is connected to C3 on a CR1000X, C4 cannot
be used in the
TimerInput()
,
PulseCount()
, or
WaitDigTrig()
instructions.
7.1.1 Built-in self-test (BIST)
After connecting the sensor to power, the sensor performs a BIST (built-in self-test) for
approximately 50 seconds (factory default). During this self-check, an internal check of the
electronics occurs.
7.2 Data logger programming
Short Cut is the best source for up-to-date programming code for Campbell Scientific data
loggers. If your data acquisition requirements are simple, you can probably create and maintain a
data logger program exclusively with Short Cut. If your data acquisition needs are more complex,
the files that Short Cut creates are a great source for programming code to start a new program
or add to an existing custom program.
NOTE:
Short Cut cannot edit programs after they are imported and edited in CRBasic Editor.
A Short Cut tutorial is available in
(p. 2). If you wish to import Short Cut code into
CRBasic Editor to create or add to a customized program, follow the procedure in
Short Cut code into CRBasic Editor
(p. 43). Programming basics for CRBasic data loggers are
CS475A Radar Water Level Sensor
11
