Apogee AC-421 Owner's Manual - Page 7

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SPREADSHEET TABLE OF MAJORITY OF SDI-12 COMMANDS

AC-421 SDI-12 Command Quick Reference

SDI-12 Command

(a = sensor

address)

aAx

aM, aM1, aM2 ...

aMC, aMC1,

aMC2 ...

aC, aC1, aC2

aCC, aCC1, aCC2

aD0, aD1,

aD2 ... ***

*Example command outputs taken using an Apogee SI-421-SS IR sensor

**Sensor manuals can be found online at:

***AC-421 automatically does display command with any measurement command

What sensor does

Queries sensor addresses

Confirm communication

Returns sensor information (e.g.,

sensor model, serial number,

firmware version, etc.)

Displays internal saved data

(e.g., calibration coefficients,

offsets, etc.)

Change sensor address to a new

value (x = 1-9 or A-Z)

Used to take a measurement

Used to take a measurement.

Data is returned with a check

character

Used to take a measurement

when more than one sensor is

used on the same data line

Used to take a measurement

when more than one sensor is

used on the same data line. Data

is returned with a check

character

Used to return recorded

measurements from the M!, C!,

or CC! commands

Returns current address for sensors on the data

Returns current sensor address

Varies, please consult your sensor's manual**

EX: 0I!  013Apogee SI-4210.62210

Varies, please consult your sensor's manual**

0D0!  0+1.72402r+09+1.01104e+07+82608.4

0D1!  0-2.92505e+06+23518-29598+6.2210

Sensor will return the value of the new address

Varies, please consult your sensor's manual**

https://www.apogeeinstruments.com/product-manuals/

SDI-12 Return*

line

Ex: ?!  0

EX: 0I!  0

EX: 0V!  00007

EX: 0A1!  1

EX: 0M!  00011

0M!  0

0D0!  0+28.04520

EX: 0MC!  00011

0M!  0

0D0!  0+28.23737BXE

EX: 0C!  000101

0D0!  0+28.00574

EX: 0CC!  000101

0D0!  0+28.19998Iee

See above examples