Apogee SI-4H1 Manual del usuario - Página 13
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where a is the sensor address ("0-9", "A-Z", "a-z") and M is an upper-case ASCII character.
The target temperature and sensor body temperature are separated by the sign "+" or "-", as in the following
example (0 is the address):
Command
Sensor Response
0M!
00011<cr><lf>
0D0!
0+23.4563<cr><lf>
0M1!
00012<cr><lf>
0D0!
0+23.4563+35.1236<cr><lf>
0M2!
00012<cr><If>
0D0!
0+1.0+35.1236<cr><If>
where 23.4563 is target temperature, 1.0 is target millivolts, and 35.1236 is detector (sensor body) temperature.
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!
a00101<cr><lf>
aC1!
a00102<cr><lf>
aC2!
a00102<cr><If>
aCC!
a00101<cr><lf>
aCC1!
a00102<cr><lf>
aCC2!
a00102<cr><If>
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
0C!
000101<cr><lf>
0D0!
0+23.4563<cr><lf>
0C1!
000102<cr><lf>
0D0!
0+23.4563+35.1236<cr><lf>
0C2!
000102<cr><If>
0D0!
0+1.0+35.1236<cr><If>
where 23.4563 is target temperature, 1.0 is target millivolts, and 35.1236 is detector (sensor body) temperature.
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:
Sensor Response when data is ready
0<cr><lf>
0<cr><lf>
0<cr><If>
Response to 0D0!
Target temperature
Target temperature and sensor body temperature
Target millivolts and sensor body temperature
Target temperature w/ CRC
Target temperature and sensor body temperature w/ CRC
Target millivolts and sensor body temperature w/CRC