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Appendix B. Entering SDI-12 Commands/Changing Settings

B.1 Changing Settings

B.1.1 Query/Set the Address

Valid addresses are 0 to 9; A through Z; and a through z. The factory default

address is set to 0. The address can be verified by sending the sensor the

Address Query command (see Table B-2).

TABLE B-2. SDI-12 Command for Querying the Address

Initial Command Response

a<cr><If>

Where a is the current address of the sensor.

Change the sensor’s address by sending the sensor the aAb! command, where a

is the original address and b is the new address. Table B-3 shows an example

of the command and response for setting the address.

TABLE B-3. Example of Setting Address

Initial Command Response

0A1!

Where 0 is the original address

and 1 is the new address

1<cr><If>

The new address (1) is set in response.

B.1.2 Set Units

The distance measurement can be reported in feet (default) or meters. Change

the units by first using the aXSU+n! command (where n=1 (feet) or 0 (meters))

followed by the aXGU! (Get Units) command. Table B-3 shows an example of

the command and response for changing this setting.

TABLE B-4. Example of Setting Units

Initial Command Response

0XSU+0!

Where the first zero is the sensor

address and the second zero sets the

units to meters

00011<cr><If>

Where (from left to right),

0—sensor’s address;

001—the amount of time (in seconds)

that you must wait before sending

another command;

1—the number of values that will be

placed in the buffer.

Subsequent Command Response

0XGU!

Where zero is the sensor address.

This is the get units command.

0+0<cr><If>

Where the first zero is the sensor

address and the second zero indicates

that the units are now meters

B-3

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Campbell CS475 Specifiche Pagina 33

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