MSB780(X) - User’s Guide
8.5 aI! Send Identification Command
This command is used to query sensors for their SDI-12 compatibility level, model number, and
serial number.
0I!<cr>013MS-MIS MSB7801.11.2.11505-183 <cr><lf>
8.6 ?! Address Query Command
When a question mark (?) is used as the address character with the acknowledge active com-
mand (a!), the sensor will respond as if it is being addressed on the SDI-12 bus. For example,
if a sensor detects ?!, it will respond with a<CR><LF>, no matter what its address may be. This
will allow a user to determine the address of a sensor. The user should understand that if more
than one sensor is connected to the bus, they will all respond, causing a bus contention.
Example:
?!<cr>0<cr><lf>
8.7 aAb! Address Change Command
This command is used to change barometer’s address a to b.
Example:
0A4!<cr>4<cr><lf>
In this example the SDI-12 address was changed from 0 to 4.
8.8 aM! Start Measurement Command
This command tells the sensor to take a measurement. The sensor does not, however, return
the measurement to the data recorder after this command. It returns the time until one or more
measurements will be ready and the number of measurements that it will make. The send data
(D0!) command must be issued to get the measurement(s).
0M!<cr>00073<cr><lf>
The sensor reply means it will take maximum “007” seconds to finish measurement, and three
values will be measured.
To tell the data recorder that the sensor has finished its measurement(s) and the data are ready.
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