Campbell CS475 Manuel télécharger pdf (Page 39)

Appendix B. SDI-12 Commands/

Changing Settings

The SDI-12 commands are entered using the 25616, Adjustment/Display

Module, or the terminal emulator in LoggerNet or PC400 (see Appendix B.2,

Using Terminal Emulator and a Datalogger to Send Commands). These

commands are also used in CRBasic or Edlog programming (see Section 7.5,

Programming).

SDI-12 commands have three components:

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

command. The sensor address allows multiple sensors to be connected to a

single control port. The default address is zero, and typically is only changed

when multiple sensors are connected to the same port. Valid addresses are 1 to

9, A to Z, or a to z.

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). SDI-12

commands supported by the radar sensors are listed in TABLE B-1.

B-1

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 53 54

Pas de commentaire

Campbell CS475 Manuel Page 39