Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 175
Table 25., Standard SDI-12 Command and Response Set, Address Query Command ?, Change Address Command
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Section 7. Installation Table 25. Standard SDI-12 Command and Response Set Command Name Command Syntax1 Response2 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) 1If 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. 2Complete response string can be obtained when using the SDI12Recorder() instruction by declaring the Destination variable as String. 3This command may result in a service request. Address Commands A single probe should be connected to an SDI-12 input when using these commands. Address Query Command (?!) Command ?! requests the address of the connected sensor. The sensor replies to the query with the address, a. Change Address Command (aAb!) Sensor address is changed with command aAb!, where a is the current address and b is the new address. For example, to change an address from 0 to 2, the command is 0A2! The sensor responds with the new address b, or in this example, 2. Send Identification Command (aI!) Sensor identifiers are requested by issuing command aI!. The reply is defined by the sensor manufacturer, but usually includes the sensor address, SDI-12 version, manufacturer's name, and sensor model information. Serial number or other sensor specific information may also be included. An example of a response from the aI! command is: 013NRSYSINC1000001.2101 where: Address = 0 SDI-12 version =1.3 Manufacturer = NRSYSINC Sensor model = 100000 Sensor version = 1.2 175
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