Apogee Instruments S2-431 Owner's Manual - Page 14
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Change Sensor Address: aAb!
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!"
a13Apogee S2-431vvvxx...xx<cr><lf>
where a is the sensor address ("0-9", "A-Z", "a-z", "*", "?"), 431 is the sensor model number, vvv is a three
character field specifying the sensor version number, 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
Characters Sent
Query running
aXAVG!
Average
Set running
aXAVGn!
Average
Description
Change the address of the sensor
Response
Description
an
a = sensor address, n = number of measurements used in
average calculation. Note: n may be multiple digits.
a
a = sensor address, n = number of measurements to be used in
average calculation. Note: n may be any value from 1 to 100.
Description
The sensor serial number and other identifying values are
returned