Campbell-scientific CS215 Temperature and Relative Humidity Probe Manuel d'utilisateur télécharger pdf (Page 37)

Appendix D. SDI-12 Sensor Support

D.1 SDI-12 Command Basics

SDI-12 commands have three components:

Sensor address (a) – a single character, and is the first character of the

command. The default address of zero (0) can be used unless multiple sensors

are connected to the same port.

Command body (e.g., M1) – an upper case letter (the “command”) followed by

alphanumeric qualifiers.

Command termination (!) – an exclamation mark.

An active sensor responds to each command. Responses have several standard

forms and terminate with <CR><LF> (carriage return – line feed). Standard

SDI-12 commands supported by the CS215 are listed in TABLE D-1.

TABLE D-1. SDI-12 Command and Response Set

Name Command Response

Acknowledge

Active

a! a<CR><LF>

Send

Identification

aI! allccccccccmmmmmmvvvxxx...xx<CR><LF>

Change

Address

aAb! b<CR><LF>

Address

Query

?! a<CR><LF>

Start

Measurement

aM! atttn<CR><LF>

Send Data aD0! a<values><CR><LF>

Start

verification

aV! atttn

D-1

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 43 44

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Campbell-scientific CS215 Temperature and Relative Humidity Probe Manuel d'utilisateur Page 37