Apogee SI-421 Manuale d'uso - Pagina 13
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executed. M commands are shown in the following examples:
Command
Response
aM!
a0011<cr><lf>
aM1!
a0012<cr><lf>
aMC!
a0011<cr><lf>
aMC1!
a0012<cr><lf>
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>
where 23.4563 is target temperature 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>
aCC!
a00101<cr><lf>
aCC1!
a00102<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
0C!
000101<cr><lf>
0D0!
0+23.4563<cr><lf>
0C1!
000102<cr><lf>
0D0!
0+23.4563+35.1236<cr><lf>
where 23.4563 is target temperature and 35.1236 is detector (sensor body) temperature.
Change Sensor Address: aAn!
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
Response to 0D0!
Target Temperature
Target Temperature and Sensor Body Temperature
Target Temperature w/ CRC
Target Temperature and Sensor Body Temperature w/ CRC
Sensor Response when data is ready
0<cr><lf>
0<cr><lf>
Response to 0D0!
Target Temperature
Target Temperature and Sensor Body Temperature
Target Temperature w/ CRC
Target Temperature and Sensor Body Temperature w/ CRC
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