Apogee Instruments PYRANOMETER SP-421 소유자 매뉴얼 - 페이지 14

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Metadata Commands

Identify Measurement Commands

The Identify Measurement Commands can be used to view the command response without making a measurement. The

command response indicates the time it takes to make the measurement and the number of data values that it returns. It

works with the Verification Command (aV!), Measurement Commands (aM!, aM1! ... aM9!, aMC!, aMC1! ... aMC9!), and

Concurrent Measurement Commands (aC!, aC1! ... aC9! , aCC!, aCC1! ... aCC9!).

The format of the Identify Measurement Command is the address, the capital letter I, the measurement command, and the

command terminator ("!"), as follows:

The format of the response is the same as if the sensor is making a measurement. For the Verification Command and

Measurement Commands, the response is atttn<CR><LF>. For the C Command, it is atttnn<CR><LF>. For the High Volume

Commands, it is atttnnn<CR><LF>. The address is indicated by a, the time in seconds to make the measurement is indicated

by ttt, and the number of measurements is indicated by n, nn, and nnn. The response is terminated with a Carriage Return

(<CR>) and Line Feed (<LF>).

Identify Measurement Command example:

3IMC2!

The Identify Measurement Command for sensor address 3, M2 command, requesting a CRC.

30032<CR><LF>

The response from sensor address three indicating that the measurement will take three

seconds and two data values will be returned.

Identify Measurement Parameter Commands

The Measurement Parameter Commands can be used to retrieve information about each data value that a command returns.

The first value returned is a Standard Hydrometeorological Exchange Format (SHEF) code. SHEF codes are published by the

National Oceanic and Atmospheric Administration (NOAA). The SHEF code manual can be found

at http://www.nws.noaa.gov/oh/hrl/shef/indexshef.htm. The second value is the units of the parameter. Additional fields

with more information are optional.

The Measurement Parameter Commands work with the Verification Command (aV!), Measurement Commands (aM!, aM1! ...

aM9!, aMC!, aMC1! ... aMC9!), and Concurrent Measurement Commands (aC!, aC1! ... aC9! , aCC!, aCC1! ... aCC9!).

The format of the Identify Measurement Parameter Command is the address, the capital letter I, the measurement command,

the underscore character ("_"), a three-digit decimal number, and the command terminator ("!"). The three-digit decimal

indicates which number of measurement that the command returns, starting with "001" and continuing to "002" and so on,

up to the number of measurements that the command returns.

The format of the response is comma delimited and terminated with a semicolon. The first value is the address. The second

value is the SHEF code. The third value is the units. Other optional values may appear, such as a description of the data value.

The response is terminated with a Carriage Return (<CR>) and Line Feed (<LF>).

<address>I<command>!

<address>I<command>_<three-digit decimal>!

a,<SHEF Code>,<units>;<CR><LF>