Campbell-scientific CS451/CS456 Pressure Transducer Manual do Utilizador descarregar pdf (Página 40)

Appendix D. SDI-12 Sensor Support

D.1.3 Send Identification Command (aI!)

Sensor identifiers are requested by issuing command aI!. The reply is defined

by the sensor manufacturer, but usually includes the sensor address, SDI-12

version, manufacturer’s name, and sensor model information. Serial number or

other sensor specific information may also be included.

An example of a response from the aI! command is:

013CSI451.Std.01_12345678

Where:

SDI-12 version = 1.3

Manufacturer = CSI

Sensor model = 451

Operating System = .Std 01

Sensor serial number = 12345678

D.1.4 Start Measurement Commands (aM!)

A measurement is initiated with M! commands. The response to each

command has the form atttnn, where

a = sensor address

ttt = time, in seconds, until measurement data are available

nn = the number of values to be returned when one or more subsequent D!

commands are issued.

D.1.5 Aborting a Measurement Command

A measurement command (M!) is aborted when any other valid command is

sent to the sensor.

D.1.6 Send Data Command (aDv!)

This command requests data from the sensor. It is normally issued

automatically by the datalogger after measurement commands aMv!. In

transparent mode, the user asserts this command to obtain data. If the expected

number of data values are not returned in response to an aD0! command, the

datalogger issues aD1!. TABLE D-2 shows the values returned when using the

send data command.

D-2

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 46 47 48

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