Campbell CS225, Product Manual

7.4 Programming

Short Cut

is the best source for up-to-date programming code for Campbell Scientific data

loggers. If your data acquisition requirements are simple, you can probably create and maintain a
data logger program exclusively with

Short Cut

. If your data acquisition needs are more complex,

the files that

Short Cut

creates are a great source for programming code to start a new program

or add to an existing custom program.

NOTE:

Short Cut

cannot edit programs after they are imported and edited in

CRBasic Editor

.

A

Short

Cut

tutorial

is

available

in

QuickStart

(p.

2).

If

you

wish

to

import

Short

Cut

code

into

CRBasic

Editor

to

create

or

add

to

a

customized

program,

follow

the

procedure

in

Importing

Short

Cut

code

into

CRBasic

Editor

(p.

17).

Programming

basics

for

CRBasic

data

loggers

are

provided

in

the

following

section.

Downloadable

example

programs

are

available

at

www.campbellsci.

eu

/downloads/cs225-example-programs

.

7.4.1

SDI12Recorder()

instruction

The

SDI12Recorder()

instruction

is

used

to

measure

the

temperature

sensors

in

the

CS225.

This

instruction

sends

a

request

to

the

sensor

to

make

a

measurement

and

then

retrieves

the

measurement

from

the

sensor.

See

Sensor

measurements

(p.

11)

for

more

information.

For

most

data

loggers,

the

SDI12Recorder()

instruction

has

the

following

syntax:

SDI12Recorder

(Destination, SDIPort, SDIAddress, “SDICommand”, Multiplier, Offset,

FillNAN, WaitonTimeout)

Each temperature sensor in the CS225 needs a unique SDI-12 address. For the

SDIAddress

,

alphabetical characters need to be enclosed in quotes (for example, “A”). Also enclose the

SDICommand

in quotes as shown. The

Destination

parameter must be an array. The required

number of values in the array depends on the command (

Table 8-1

(p. 11)).

FillNAN

and

WaitonTimeout

are optional parameters (refer to

CRBasic Help

for more

information).

7.4.2 Slow sequence program instructions

Use the slow sequence program instructions when the CS225 measurements will exceed the
program scan interval of the additional instruments included in the station. For example, if a
CS225 consists of 17 or more temperature sensors, the time required to poll all sensors and
receive data can be greater than 5 seconds based on the 300 ms execution time for the

aR0!

command. For more details on the use of the slow sequence program instructions, reference the

CS225 Temperature String

10