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0C2!
000101<cr><lf>
0D0!
+20.0
0C3!
000101<cr><lf>
0D0!
0+90.2<cr><lf>
where 30.0 is watts and 1.0 is mV and 20.0 is
Change Sensor Address: aAn!
The change sensor address command allows the sensor address to be changed. If multiple SDI-12 devices are on
the same bus, each device will require a unique SDI-12 address. For example, two SDI-12 sensors with the factory
address of 0 requires changing the address on one of the sensors to a non-zero value in order for both sensors to
communicate properly on the same channel:
Command
Response
aAb!
b<cr><lf>
where a is the current (old) sensor address ("0-9", "A-Z"), A is an upper-case ASCII character denoting the
instruction for changing the address, b is the new sensor address to be programmed ("0-9", "A-Z"), and ! is the
standard character to execute the command. If the address change is successful, the datalogger will respond with
the new address and a <cr><lf>.
Send Identification Command: aI!
The send identification command responds with sensor vendor, model, and version data. Any
measurement data in the sensor's buffer is not disturbed:
Command
Response
"aI!"
a14Apogee SU-221vvvByyxx...xx<cr><lf>
where a is the sensor address ("0-9", "A-Z", "a-z", "*", "?"), 421 is the sensor model number, vvv is a three
character field specifying the sensor firmware version, Byy is the hardware version, and xx...xx is serial number.
Running Average Command
The running average command can be used to set or query the number of measurements that are averaged
together before returning a value from a M! or MC! command. For example, if a user sends the command
"0XAVG10!" to sensor with address 0, that sensor will average 10 measurements before sending the averaged
value to the logger. To turn off averaging, the user should send the command "aXAVG1!" to the sensor. To query
the sensor to see how many measurements are being averaged, send the command "aXAVG!" and the sensor will
return the number of measurements being averaged (see table below). The default for sensors is to have averaging
turned off.
Command Name
Query running
Average
Set running Average
.
µmol
Description
Change the address of the sensor
Characters Sent
Response
aXAVG!
An
aXAVGnn!
A
Description
The sensor serial number and other identifying values are
returned
Explanation
a = sensor address, n = number of measurements used
in average calculation. Note: n may be multiple digits
a = sensor address, n = number of measurements to be
used in average calculation. Note: n may be any value
from 1 to 100.