Campbell Scientific CS450/CS455 Pressure Transducer - Manual (Page 18)

CS450/CS455 Pressure Transducer
The CS450/CS455 is shipped from the factory with the address set to 0. The
address on the CS450/CS455 can be changed by sending an SDI-12 change
address command “aAb!”, where a is the original address and b is the new
address. The change-address command can be issued from most SDI-12
recorders.
To change the address of a sensor that has a default address of 0 to the address
of 1 the following command can be sent:
“0A1!”
When it is necessary to measure more than one CS450/CS455, it is easiest to
use a different control port for each CS450/CS455 instead of changing the
address. If additional control ports are not available, then the address will need
to be changed.
3.2.2 Extended SDI-12 Commands
Extended SDI-12 commands can be used to configure the CS450/CS455 data
output and sample number. These commands are used to select the temperature
units (Celsius or Fahrenheit), pressure/level units (psig, kPa, bar, feet, meter,
inches, millimeter), and the integration time for each measurement. If level
units are selected, they will represent level of fresh water. The Multiplier
(slope) and offset should be used to correct for relative density of water.
Sample number represents the number of values used to provide the output
value received by the datalogger. This output value is an average of the
samples.
Extended commands were introduced in Version 4. Versions
previous to this did not have the extended commands. NOTE
3.2.2.1 Units
The extended SDI-12 command used to configure output units is
“aXCONFIG1=tt,pp,mmm.mm,000.00!”, where a = the SDI-12 address of the
sensor, tt = temperature units, pp = measurement unit, mmm.mm = multiplier
(slope), and 000.00 = offset;
where valid entries for tt (temperature) are:
0 = Celsius
1 = Fahrenheit
and valid entries for pp (pressure/level) are:
0 = psig
1 = kPa
2 = Bar
3 = Feet
4 = Meter
5 = Inch
6 = Millimeter
12