Campbell CS475, Instruction Manual

Page: 25 / 50

CS475, CS476, and CS477 Radar Water Level Sensor
15
CRBasic Editor
(p. A-1)
. Programming basics for CRBasic dataloggers are
provided in the following sections. A complete program example can be found
in Appendix B , Example Program
(p. B-1)
.
7.4.1 SDI12Recorder() Instruction
Use the SDI12Recorder() measurement instruction to program the datalogger
to measure the sensor. This instruction sends a request to the sensor to make a
measurement and then retrieves the measurement from the sensor. See Section
8.2 , Sensor Measurement
(p. 16)
, for more information.
When using a CR200(X), the SDI12Recorder() instruction has the following
form:
SDI12Recorder (Destination, OutString, Multiplier, Offset)
For the other CRBasic dataloggers, the SDI12Recorder() instruction has the
following form:
SDI12Recorder (Destination, SDIPort, SDIAddress, “SDICommand”,
Multiplier, Offset)
The Destination parameter must be an array of length three, with the first index
for stage measurement (m or ft), the second for distance (m or ft), and the third
for an error code (see Section 9 ,
Diagnostics, Repair, and Maintenance
(p. 16)
).
The stage measurement calculation is based on an initial water stage value; see
Appendix C.1.2 , Set Water Stage
(p. C-3)
, for instructions on changing the SDI-
12 address through the datalogger.
Variations:
• Set
SDICommand
to “M!” or “C!” – see Section 8 , Operation
(p. 15)
,
to determine which is best for your application.
8. Operation
8.1 Default Settings
The default settings (TABLE 8-1 ) are used in most circumstances.
TABLE 8-1. Default Settings
Setting Default
SDI-12 Address
0 (change only if two sensors are connected to the
same port; valid addresses are 0 through 9, A through
Z, and a through z; see Appendix C.1.1 ,
Query/Set the
Address
(p. C-2)
)
Units of Measure 1 = feet (see Appendix C.1.4 , Set Units
(p. C-4)
)
Water Conditions
1 = smooth (typical peak to trough of wave ≤4 inches;
see Appendix C.1.5 , Set Water Conditions
(p. C-5)
)
Power Operation
Mode
1 = on (sensor is always on until new power operation
mode command received; see Appendix C.1.6 , Set
Power Operation Mode
(p. C-6)
)