Apogee Instruments S2-411 Benutzerhandbuch - Seite 15
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Command
Sensor Response
0M0!
00012<cr><lf>
0D0!
0+0.010+0.109<cr><lf>
0M1!
00012<cr><lf>
0D0!
0+0.2858+3.3905<cr><If>
0M2!
00011<cr><If>
0D0!
0+0.8445<cr><lf>
0M3!
00013<cr><If>
0D0!
0+35.2<cr><If>
where 0.010 and 0.109 are the two Watts m⁻² measurements for lower and upper wavelengths respectively,
0.2858 and 3.3905 are the two mV signals, and 0.8445 is the estimated NDVI value.
Concurrent Measurement Command: aC!
A concurrent measurement is one which occurs while other SDI-12 sensors on the bus are also making
measurements. This command is similar to the "aM!" command, however, the nn field has an extra digit and the
sensor does not issue a service request when it has completed the measurement. Communicating with other
sensors will NOT abort a concurrent measurement. Data values generated in response to this command are stored
in the sensor's buffer for subsequent collection using "D" commands. The data will be retained in the sensor until
another "M", "C", or "V" command is executed:
Command
Response
a00101<cr><lf>
aC! or aC0!
a00102<cr><lf>
aC1!
a00102<cr><lf>
aC2!
a00103<cr><lf>
aC3!
aCC! or aCC0!
a00101<cr><lf>
a00102<cr><lf>
aCC1!
a00102<cr><lf>
aCC2!
a00103<cr><lf>
aCC3!
where a is the sensor address ("0-9", "A-Z", "a-z", "*", "?") and C is an upper-case ASCII character.
For example (0 is the address):
Command
Sensor Response
0C0!
000102<cr><lf>
0D0!
0+0.010+0.109<cr><If>
0C1!
000102<cr><If>
0D0!
0+0.2858+3.3905<cr><lf>
0C2!
000101<cr><lf>
0D0!
0+0.8445<cr><lf>
0C3!
000103<cr><If>
0D0!
0+35.2<cr><If>
Sensor Response when data is ready
0<cr><lf>
0<cr><lf>
0<cr><If>
0<cr><If>
Response to 0D0!
Returns calibrated lower wavelength output and calibrated upper wavelength
output in Watts m⁻²
Returns lower wavelength detector millivolts and upper wavelength detector
millivolts
Returns the estimated NDVI value (downward-looking) or returns an invalid
estimated NDVI value (upward-looking)
Returns angle offset from vertical in degrees. (0 degrees if pointed up, 180
degrees if pointed down.)
Returns calibrated lower wavelength output and calibrated upper wavelength
-2
output in W m
w/CRC
Returns lower wavelength detector millivolts and upper wavelength detector
millivolts w/CRC
Returns the estimated NDVI value (downward-looking) or returns an invalid
estimated NDVI value (upward-looking) w/CRC
Returns angle offset from vertical in degrees. (0 degrees if pointed up, 180
degrees if pointed down.) w/CRC