Campbell Scientific Sentek EnviroSCAN EasyAG SDI-12 Manual v 3.4 User Manual
Page 15
EnviroSMART & EasyAG SDI-12 Probe Manual
Copyright © 1991 – 2003 Sentek Pty Ltd All rights reserved
Page 10
aD0!
a+001.0000+001.1234+000.0200
aD1!
a+000.1234+000.0000+123.1234
aD2!
a+010.1200+000.1243+044.8750
If there are more than 9 salinity values, a further Start Measurement command (aM! or aMn!) must be
issued.
Command
Response
aM3!
a0187
The response indicates that another 7 salinity values will be available within a time of 18 seconds. After
approximately 16 seconds, the probe will issue a Service Request (a
address), and the controlling device will then issue Send Data commands (aDn!) to read the values.
Command
Response
aD0!
a+002.0010+003.1234+001.0200
aD1!
a+011.1234+001.0100+011.3344
aD2!
a+012.0230
Note: The Send Data commands (aDn!) must be issued in increasing order.
Data Reading using the Start Concurrent Measurement Command (aC! or aCn!)
The following table shows the allocation of sensors for the Start Concurrent Measurement commands
(aC! or aCn!):
aC!
Read Soil Moisture values 1 – 16
aC1!
Read Salinity values 1 – 16
aC2!
Reserved
aC3!
Reserved
aC4!
Read Soil Moisture Configuration values C constants 1 – 16
aC5!
Read Soil Moisture Configuration values B constants 1 – 16
aC6!
Read Soil Moisture Configuration values A constants 1 – 16
aC7!
Reserved
aC8!
Read Salinity Sensor Depth values 1 – 16
aC9!
Read Soil Moisture Sensor Depth values 1 – 16
Note: Start Concurrent Measurement commands (aC! or aCn!) “aC2!”, “aC2!” and “aC7!” will result in
a response of “a0000