Table 7-2: Wire color, function, and data logger connection for 2-wire configuration
Color
Wire function
Data logger connection
Orange
RTD signal/–
RTD
SE (single-ended, analog-voltage input) or CR6 U terminal
configured for single-ended analog input
1
Brown
Volt
RTD
VX (voltage excitation), EX (voltage excitation), or CR6 U
terminal configured for voltage excitation
1
Black
Excitation
reference
⏚
(analog ground)
Clear
Shield G
⏚
(analog ground)
1
U terminals are automatically configured by the measurement instruction.
The yellow, purple, blue, white, and gray wires are not used.
7.2 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. 4). 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. 21). Programming basics for CRBasic data loggers are
provided in the following sections.
7.2.1 CRBasic programming
The CRBasic program needs to measure the resistance and then convert the resistance
measurement to a temperature measurement. The CRBasic instruction used to measure the
resistance depends on whether it is a 4-wire or 2-wire configuration. The
PRTCalc()
instruction
is used to convert the resistance to a temperature measurement. The CRBasic instructions are
described in the following sections. Complete program examples can be found in
TempVue 10 PT-100 Class A, Precision Air Temperature Sensor
11
