Apogee Instruments SQ-647-SS Panduan Pemilik - Halaman 12
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0M3!
00011<cr><If>
0D0!
0+2000.0<cr><If>
0M4!
a0011<cr><If>
0D0!
0+90.2<cr><lf>
-2
where 2000.0 is µmol m
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
aC! or aC0!
a00101<cr><lf>
aC1!
a00101<cr><lf>
aC2!
a00101<cr><lf>
aC3!
a00101<cr><lf>
aC4!
a00101<cr><lf>
aCC! or aCC0!
a00101<cr><lf>
aCC1!
a00101<cr><lf>
aCC2!
a00101<cr><lf>
aCC3!
a00101<cr><lf>
aCC4!
a00101<cr><lf>
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!
000101<cr><lf>
0D0!
0+2000.0<cr><lf>
0C1!
000101<cr><If>
0D0!
0+400.0<cr><If>
0C2!
000101<cr><lf>
0D0!
0+2000.0<cr><lf>
0C3!
000101<cr><If>
0D0!
0+2000.0<cr><If>
0C4!
000101<cr><If>
0D0!
0+90.2<cr><lf>
-2
where 2000.0 is µmol m
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:
-1
s
.
Response to 0D0!
Returns µmol m
-2
Returns millivolt output
-2
Returns µmol m
Returns immersed µmol m
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.
Returns µmol m
-2
Returns millivolt output w/ CRC
Returns µmol m
-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.
-1
s
and 400.0 is mV.
0<cr><If>
0<cr><lf>
s
-1
-1
s
-2
-1
s
for underwater measurements
s
-1
w/CRC
s
-1
w/ CRC
-2
s
-1
for underwater measurements w/ CRC