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Appendix B. SDI-12 Commands/Changing Settings

B-3

microwave pulses. Any echo occurring 0.5 m (1.6 ft) short of the distance you

entered will be considered noise.

To start False Echo Learn, do the aXSFEL+nnn.nnn! command (where nnn.nnn =

the actual distance to the water) followed by the aD0! (Send Data) command.

Table 4-5 in Section 4, Quickstart, shows an example of the command and

response.

B.1.2 Set Water Stage

With the Set Water Stage command, you enter the initial depth of the water, and the

sensor will automatically measure the distance between the sensor and the water

surface. The water stage setting and the initial distance measurement are used to

calculate subsequent water stage measurements. Correct stage measurements

require that the water stage setting be in the same units as the Units of Measure

setting. You can find out if the sensor is set to metres or feet by using the aXGU!

(Get Unit) command.

To set the water stage, do an aXSS+nnn.nnn! command (where nnn.nnn = the

initial water depth) followed by the aD0! (Send Data) command. Table 4-6 in

Section 4, Quickstart, shows an example of the command and response for entering

this setting.

B.1.3 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.

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Campbell CS475 Bedienungsanleitung Seite 41