Campbell 21X Manuale dell'Operatore Scaricare il pdf (Pagina 134)

SECTION

12.

PROGRAM

CONTROL

INSTRUCTIONS

the

start

of the

instructions

to execute

if

the test

condition is false

(Figure

3.8-1).

The

Else

Instruction

is

optional;

when it is

omitted,

a false

comparison

will result

in execution

branching

directly to

the End

Instruction. Instruction

94

has

no

parameters.

***

95 END

***

FUNCTION

Instruction

95 is used

to

indicate

the end/return

of

a

subroutine

(lnstruction

85), the

end

of a

loop

(lnstruction

87),

the

end

of an lf

Then/Else

sequence,

or the

end of

the

Case

statement

(lnstructions

88-93 when used with

command

30). The

End Instruction has

no

parameters.

***

96 ACTIVATE

SERIAL DATA

OUTPUT

***

FUNCTION

Instruction

96

is

used instead to

activate

the

tape, Storage Module,

or

serial

port

output.

By

using

Program

Control Instructions

to allow

execution

of

Instruction

96

only

at certain

times,

the user can

control when the output

is

active.

When used

to send

data to the SM192

or

SM716 Storage Module, the 21X

can

determine

whether or not

the Storage Module is

connected. lf

the Storage Module is

not

connected, the

data will not be sent

until it is

connected. Instruction

96

also allows

for faster

data

output via

the

serial

port

with

the Binary

Option, which

outputs

FINAL STORAGE

FORMAT

(2

bytes

per

low

resolution

data

point)

instead

of

ASCII (10

bytes

per

data

point,

Section 4.5). Appendix

C describes FINAL

STORAGE FORMAT.

Section

4.3

describes

Tape output.

A

single

parameter

is

used to select whether

the

instruction is

to controlthe tape,

Storage

Module,

or the

printer

output, and if

the

printer

is

selected,

the format

and baud

rate.

Instruction

96 must be entered

separately for

each output

device used.

lnstruction

96 uses

the same

Tape

and Printer

pointers

as

the

*8

and

*9

modes which

can be

used to

get

a

residual

or

paftial

dump

of Final

Storage

(Section

4). Note that

the Tape

output

will

not activate

until

at least 512 Final

Storage

Locations have

been

stored.

PAR.

NO.

12-6

Do not use

*4

to activate

a device that is

activated by Instruction

96.

DATA

TYPE DESCRIPTION

Option

OO

--

TAPE

The

left digit

specifies the

and the right

specifies the baud

rate

for

the

printer.

The

code

tape must

be 00, and for

Storage

Module

it is

30.

X

=

Baud

0--

1X

--

PRINTER.

ASCII 1

.-

1

2X

--

PRINTER,

Binary 2

--

30

--

SM192

or SM716 3

--

76

31

--

Send filemark

to

SM192/716

***

97 INITIATE

***

TELECOMMUNICATIONS

Instruction 97 is used

to

have

the

21X initiate

telecommunications

in response to certain

conditions. When

the

instruction is

executed

with the interrupt disable flag

set

low, the 21X

will make

a

calland send

the lD

number

specified

in

Parameter

I

(in

ASCII at the

specified

baud

rate). The lD number will

be

every 4

seconds

untilthe

21X receives a

response

or

the time specified in Parameter

3

expires. The expected response is to have

the

lD

sent back to the 21X,

at

which time the 21X

will

go

into

telecommunications

and the normal

telecommunications

time limit will take effect

(Section

5.1).

The 21X will

not send any data

without

first

receiving

a command to do so.

TELCOM

program

in

Campbell Scientific's

PC208

datalogger support software enables

PCIXT/AT/PS2 and

compatible

computers

to

automatically answer calls

and retrieve data.

When

the 21X

receives

a correct digit for

the

lD

it restarts

the

4

second timer.

There are then 4

seconds in

which

the next

digit must

be

before

the 21X

again

sends the lD. When the

21X

sends the

lD,

it expects

the

response

to

start from

the

beginning. lf

an incorrect

character is detected, the 21X

will

immediately

send the correct lD. lf

a correct response

is

not

received

within the time

allotted in

Parameter

3.

the 21X will

hang

up.

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