Apogee SE-421 Gebruikershandleiding - Pagina 13
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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><lf>
aM1!
a0011<cr><lf>
aM2!
a0011<cr><lf>
aM3!
a0011<cr><lf>
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!
+30.0<cr><lf>
0M1!
00011<cr><lf>
0D0!
+1.0<cr><lf>
0M2!
00011<cr><lf>
0D0!
+20.0
0M3!
00011<cr><lf>
0D0!
0+90.2<cr><lf>
where 30.0 is watts and 1.0 is mV and 20.0 is
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>
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!
+30.0<cr><lf>
0C1!
000101<cr><lf>
0D0!
+1.0<cr><lf>
Response to 0D0!
Returns watts
Returns detector millivolts
Returns µmol
Returns angle offset from vertical in degrees. (0 degrees if pointed up, 180
degrees if pointed down.)
Sensor Response when data is ready
0<cr><lf>
0<cr><lf>
0<cr><lf>
0<cr><lf>
.
µmol
Response to 0D0!
Returns watts
Returns detector millivolts
Returns µmol
Returns angle offset from vertical in degrees. (0 degrees if pointed up, 180
degrees if pointed down.)