Campbell CS475 Manual de usuario descargar pdf (Pagina 39)

B-1

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. These commands are also used in

CRBasic or Edlog programming (see Section 7.5, Programming).

During normal communication, the datalogger sends the address, together with a

command, to the sensor. The sensor then replies with a “response”.

SDI-12 command codes used with the radar sensor are listed in Table B-1. The

SDI-12 address and the command/response terminators have the following rules:

• The sensor address is an ASCII character. Valid addresses are: 0–9, A–Z, a–z,

*, ?. Sensors are initially programmed at the factory with the address of 0 for

use in single sensor systems. Addresses 1 to 9 and A to Z or a to z are used for

additional sensors connected to the same port.

• All commands/responses are upper-case printable ASCII characters.

• Commands must be terminated with a ! character.

• Responses are terminated with <cr><lf> characters.

• The command string must be transmitted in a contiguous block with no gaps of

more than 1.66 milliseconds between characters.

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 47 48

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Campbell CS475 Manual de usuario Pagina 39