Campbell CS475, Instruction Manual

Page: 37 / 50

Appendix C. SDI-12 Commands/ Changing Settings
C-3
Change the sensor’s address by sending the sensor the aAb! command, where
“a” is the original address and “b” is the new address. TABLE C-3 shows an
example of the command and response for setting the address.
TABLE C-3. Example of Setting Address
Initial Command Response
0A1!
Where 0 is the original address
and 1 is the new address.
1<cr><If>
The new address (1) is set in response.
C.1.2 Set Water Stage
With the
Set Water Stage
command, you enter the initial depth of the water,
and the sensor will automatically measure the distance between the sensor and
the water surface. The water stage setting and the initial distance measurement
are used to calculate subsequent water stage measurements. Correct stage
measurements require that the water stage setting be in the same units as the
Units of Measure setting. You can find out if the sensor is set to meters or feet
by using the aXGU! ( Get Unit ) command.
To set the water stage, do an aXSS+nnn.nnn! command (where nnn.nnn = the
initial water depth) followed by the aD0! (
Send Data
) command. TABLE C-4
shows an example of the command and response for entering this setting.
TABLE C-4. Example for Setting Water Stage
Initial Command Response
0XSS+7.010!
Where (from left to right),
0—sensor’s address;
7.010—the initial water depth value
used to calculate subsequent stage
measurements.
00011<cr><If>
Where (from left to right),
0—sensor’s address;
001—the amount of time (in
seconds) that you must wait before
sending the send data command;
1—the number of values that will be
placed in the buffer.
Subsequent Command Command Response
0D0!
Where the first zero is the sensor
address.
This is the send data command.
0+7.010<cr><If>
Where (from left to right),
0—sensor’s address;
7.010—the initial water depth value
used to calculate subsequent stage
measurements.
C.1.3 Start False Echo Learn
The Start False Echo Learn command is an essential function during the
startup of the sensor. It is also used during testing if a problem is encountered.
The command allows the unit to learn about false echoes (noise) in the area.
With the False Echo Learn command, you enter the actual distance to the
water surface, as measured in meters or feet, depending on the unit setting. The