Apogee Instruments S2-411 Benutzerhandbuch - Seite 14
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Supported Commands for Apogee Instruments S2-400 Series NDVI Sensors
Instruction Name
Address Query Command
Change Address Command
Acknowledge Active Command
Send Identification Command ("I"
command)
Calibration Verification ("V" command)
Measurement Command ("M"
command)
Measurement Command w/ Check
Character ("M" command)
Concurrent Measurement Command
("C" command)
Concurrent Measurement Command w/
Check Character ("C" command)
Get Data Command ("D" command)
Get/Set Alpha Command
Make Measurement Command: M!
The make measurement command signals a measurement sequence to be performed. Data values generated in
response to this command are stored in the sensor's buffer for subsequent collection using "D" commands. Data
will be retained in sensor storage until another "M", "C", or "V" command is executed. M commands are shown in
the following examples:
Command
Response
a0011<cr><If>
aM! or aM0!
a0012<cr><If>
aM1!
a0012<cr><If>
aM2!
a0013<cr><If>
aM3!
a0011<cr><If>
aMC0!
a0012<cr><If>
aMC1!
a0012<cr><If>
aMC2!
a0013<cr><If>
aMC3!
"<cf>" is a carriage return and "<lf>" is line feed
where a is the sensor address ("0-9", "A-Z", "a-z") and M is an upper-case ASCII character.
The data values are separated by the sign "+", as in the following example (0 is the address):
Instruction Syntax
?!
aAb!
a!
aI!
aV!
aM!
aMC!
aC!
aCC!
aD0!
aXALPHA!
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 an estimated NDVI value from a downward-looking sensor. Returns an
invalid estimated NDVI value from an upward-looking sensor. (See "Get/Set Alpha
Command" section for more details.)
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
output in Watts m⁻² 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.)
Description
Used when the address is unknown to have the sensor
identify its address, all sensors on data line respond
Changes the sensor address from a to b
Responds if the sensor with address a is on the line
Responds with sensor information
Retrieves calibration coefficients
Tells the sensor to take a measurement
Tells the sensor to take a measurement and return it
with a check character
Used to take a measurement when more than one
sensor is used on the same data line
Used to take a measurement when more than one
sensor is used on the same data line. Data is returned
with a check character.
Retrieves the data from a sensor
Sets or retrieves the alpha value for NDVI estimation