Campbell Scientific CR10 CR10 Measurement and Control - Page 142

01:

02:

03:

SECTION

9.

INPUT/OUTPUT INSTRUCTIONS

PARAM.

DATA

NUMBER

TYPE

DESCRIPTION

4

ADDRESS (0-e)

4

TIMEA/ALUES

tttn:

ttt=time(sec)

n=no. values

4

LOCATION starting

loc.

for

n

values

Input locations

altered:

0

Intermediate locations required:

82.

This

requires that the default setting of

64

be

increased.

The

*A

mode (second

window)

is

used

to

specify Intermediate locations.

PARAMETER

1.

ADDRESS

Enter the address for the CR10 acting as

a

SDI-

12

sensor

(0-9).

Each SDI-12

sensor

must

have

a

unique

address.

Non standard

addresses may be used by entering the

appropriate

ASCI

I

code.

PARAMETER

2,

TIMEA/ALUES

Enter the

time

required for

the

sensor

CRl

O

to

complete subroutine

98

followed

by

the

number

of input locations

to be

returned to

the

SDI-12

recorder.

The

format

of

the

entry

must

be'tttn'

where ttt specifies the time and n

is

the

number

of input locations values.

The time to complete subroutine

98

is

the

time

required to execute

all

instructions from

Instruction 106

(SDl-12

sensor) to the final

Instruction 95

(End).

The entered

time

may

be

longer than the actual time without slowing

the

data exchange because the sensor

CR1

0

signals

the

SDI-12

data

recorder when the data

is ready for

transfer.

lf the entered

time

is

too

short the sensor CR10

will

not respond properly

and the data values

will

not

be

transferred.

Enter

a

time of

0

to transfer the values already

stored in input locations,

in

this case the

remainder

of

the

subroutine is not executed.

A

maximum of

9

input locations

can

be

transferred at one

time

since 'n'

is

a single digit.

See Parameter 3 LOCATION description

for

information

on

transferring

more

than

9

locations.

PARAMETER

3.

LOCATION

This

parameter determines

the

starting input

location for the 'n' values

to

be returned to the

recorder.

The'M' or'M1-M9'

command

issued

by

the

SDI-12 recorder determines

if

the

starti

location is actually that specified

in

Parameter

3

or-a multiple of 'n' past Parameter

3.

Starting input location

=

Parameter 3

+

(n*x),

where n

is

specified

in

Parameter

2,

and,

x

is

the

number following

the

'M' sent

by

the

SDI-12

recorder (1-9).lf

the'M'

command is sent

by

the

recorder x

=

0.

Results

of lnstruction

106

The sensor CR10

will

return a set

of

input

locations

in

response to

the

M or

Mt..M9

command

sequence. The

set of Locations

returned

is

determined by Parameters 2 and

3

of

Instruction

106.

The three values, sent

in

response to a V

command

sequence,

indicate the status

of

the

sensor

CR10.

The

first

and second values are

from

the

*B

mode

of

the

sensor CR10, giving

the

number

of

watchdog

errors (E08) and the

number of table overruns

that

have occurred.

The

third

is

a signature of the sensor CR10

memory. This

signature

is

created by

the

same

technique that

the

Instruction

19

(Signature)

uses.

The

CR10

manualcontains

more

information on

*B

and

Instruction

19.

In

response to

an

I

command,

the

sensor CR10

sends the string

'l0CAMPBELL

CR10

001

aaaa' where

aaaa

is

the

number from

the

eighth

window

of

the "B

mode.

9-18

Campbell Scientific CR10 CR10 Measurement and Control - Page 142

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