Apogee Instruments SQ-647-SS Manuale d'uso - Pagina 11
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Supported Commands for Apogee Instruments SQ-647 Quantum Light Pollution Sensors
Instruction Name
Acknowledge Active Command
Send Identification Command
Measurement Command
Measurement Command w/ Check
Character
Change Address Command
Concurrent Measurement Command
Concurrent Measurement Command
w/ Check Character
Address Query Command
Get Data Command
Verification Command
Running Average 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
aM! or aM0!
a0011<cr><If>
aM1!
a0011<cr><If>
aM2!
a0011<cr><If>
aM3!
a0011<cr><If>
aM4!
a0011<cr><If>
aMC! or aMC0!
a0011<cr><If>
aMC1!
a0011<cr><If>
aMC2!
a0011<cr><If>
aMC3!
a0011<cr><If>
aMC4!
a0011<cr><If>
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):
Command
Sensor Response
0M0!
00011<cr><lf>
0D0!
0+2000.0<cr><lf>
0M1!
00011<cr><lf>
0D0!
0+400.0<cr><lf>
0M2!
00011<cr><If>
0D0!
0+2000.0<cr><If>
Instruction Syntax
a!
Responds if the sensor with address a is on the line
aI!
Responds with sensor information
aM!
Tells the sensor to take a measurement
Tells the sensor to take a measurement and return it with a
aMC!
check character
aAb!
Changes the sensor address from a to b
Used to take a measurement when more than one sensor is
aC!
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
aCC!
character.
Used when the address is unknown to have the sensor identify
?!
its address, all sensors on data line respond
aD0!
Retrieves the data from a sensor
Returns sensor coefficients as multiplier, offset, solar
aV!
multiplier, and immersion effect correction factor
aXAVG!
Returns or sets the running average for sensor measurements.
Response to 0D0!
Returns µmol m
-2
s
-1
Returns millivolt output
Returns µmol m
-2
s
-1
Returns immersed µmol m
-2
Returns angle offset from vertical in degrees. (0 degrees if pointed up, 180 degrees if
pointed down.) Available in sensors with serial number 3033 or greater.
-2
-1
Returns µmol m
s
w/CRC
Returns millivolt output w/ CRC
Returns µmol m
-2
s
-1
w/ CRC
-2
Returns immersed µmol m
Returns angle offset from vertical in degrees w/CRC. (0 degrees if pointed up, 180 degrees
if pointed down.) Available in sensors with serial numbers 3033 or greater.
Sensor Response when data is ready
0<cr><lf>
0<cr><lf>
0<cr><If>
Description
s
-1
for underwater measurements
-1
s
for underwater measurements w/ CRC