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Appendix B. SDI-12 Commands/Changing Settings

B-2

Table B-1. SDI-12 Commands

Function SDI-12 Command

Address Query

Send Identification

aI!

Acknowledge Active

Change Address

aAb!

Where a is the current address and b is the new

address.

Start Verification

aV!

Start Measurement

aM!

Start Measurement and

Request CRC

aMC!

Send Data

aD0!...aD9!

Additional Measurements

aM1!...aM9!

Additional Measurement and

Request CRC

aMC1!...aMC9!

Start Concurrent Measurement

aC!

Start Concurrent Measurement

and Request CRC

aCC!

Additional Concurrent

Measurements

aC1!...aC9!

Additional Concurrent

Measurements and Request

CRC

aCC1!...aCC9!

Start False Echo Learn

aXSFEL+n!

n = distance necessary to clear the obstruction

Set Power n Operation Mode

aXSPOM+n!

n = 2 (auto), 1 (on), or 0 (off)

Get Power Operation Mode

aXGPOM!

2 = auto; 1=on; 0=off

Get Water Conditions

aXGWC!

n = 0 (auto), 1 (smooth) 2 (medium), or 3 (rough)

Set Water Conditions

aXSWC+n!

n = 0 (auto), 1 (smooth) 2 (medium), or 3 (rough)

Where n is the new water condition.

Set Water Stage

aXSS+n!

n = floating point number that is the initial stage

or level of the water surface above the reference.

Where n is the new water stage.

Get Unit

aXGU!

0 = metres; 1=feet

Set Unit

aXSU+n!

n = 0 (metres) or 1 (feet)

Where n is the new unit of measurement.

Reset Sensor

aXRS!

0 = reset unsuccessful; 1=reset successful

Resets the sensor to its factory settings.

B.1 SDI-12 Command Descriptions

B.1.1 Start False Echo Learn

The Start False Echo Learn command is an essential function during the start-up of

the sensor. It is also used during testing if a problem is encountered. The command

allows the unit to learn about false echoes (noise) in the area. With the False Echo

Learn command, you enter the actual distance to the water surface, as measured in

metres or feet, depending on the unit setting. The radar sensor then emits the short

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