Campbell Scientific CR200X CR200/CR200X-series Dataloggers - Page 125
Table 14., Standard SDI-12 Command & Response Set
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Section 11. Programming Resource Library SDI-12 commands and responses are defined by the SDI-12 Support Group (www.sdi-12.org) and are summarized in TABLE. Standard SDI-12 Command & Response Set (p. 113). Sensor manufacturers determine which commands to support. The most common commands are detailed below. Table 14. Standard SDI-12 Command & Response Set Name Command1 Response2 Break Continuous None spacing for at least 12 milliseconds Acknowledge Active a! a Send Identification aI! allccccccccmmmmmmvvvxxx...xx Change Address aAb! b (support for this command is required only if the sensor supports software changeable addresses) Address Query ?! a Start Measurement3 aM! atttn Start Measurement and Request CRC3 aMC! atttn Send Data aD0! . . . aD9! a or a a or a a or a a or a a or a Additional Measurements3 aM1! . . . aM9! atttn atttn atttn atttn atttn Additional Measurements and Request CRC3 aMC1! ... aMC9! atttn Start Verification3 aV! atttn Start Concurrent Measurement aC! atttnn Additional Concurrent Measurements aC1! . . . aC9! atttnn atttnn atttnn atttnn atttnn Additional Concurrent Measurements and Request CRC aCC1! ... aCC9! atttnn Continuous Measurements aR0! ... aR9! a (formatted like the D commands) Continuous Measurements and Request CRC aRC0! ... aRC9! a (formatted like the D commands) 1 If the terminator '!' is not present, the command will not be issued. The CRBASIC SDI12Recorder () instruction, however, will still pick up data resulting from a previously issued "C!" command. 2 Complete response string can be obtained when using the SDIRecorder () instruction by declaring the Destination variable as String. 3This command may result in a service request. 113