Campbell CR500 Spezifikationen PDF herunterladen (Seite 38)

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7.1.4 USING

COMPUTER

WITH

DATALOGGER

SUPPORT

SOFTWARE

Direct

datalogger communication

programs

in

the datalogger

suppolt software

(PC208E,

PC500,

TCOM

datalogger

session)

provide

a

menu

selection of tools to

perform

the

datalogger

functions

(e.9.,

set

clock, send

program,

monitor measurements,

and collect

data).

The

user also has

the option of directly

entering

keyboard

commands via

a

built-in

terminal

emulator

(Section

7.1.5).

When

using the support software,

the

computer's

baud

rate,

port,

and

modem

types

are specified

and

stored

in

a file for future use.

The

simplest and most common

interface is the

SC32A

Optically lsolated

RS232 Interface. The

SC32A

converts and optically

isolates the

voltages

passing

between

the CR500 and the

external

terminal device.

The

SC12 Two Peripheral

cable

which

comes

with

the SC32A is used to

connect the CS l/O

port

of

the

CR500

to the 9

pin port

of the SC32A

labeled

"Datalogger".

Connect the

"Terminal/Printer"

port

of

the SC32A

to the

serial

port

of the computer with

a straight

25

pin

cable

or, if

the

computer

has a 9

pin

serial

port,

a standard

9 to 25

pin

adapter

cable.

7.1.5 ASCIITERMINAL

OR

COMPUTER WITH

TERMINAL

EMULATOR

Devices

which can be used

to communicate

with

the CR500 include standard

ASCII

terminals

and computers

programmed

to

function

as a terminal emulator.

To communicate

with any

device other than the

CR1OKD,

the CR500 enters its Telecom-

munications

Mode

and responds

only to

valid

telecommunications

commands. Within

the

Telecommunications

Mode,

there are 2

"states";

the

Telecommunications

Command state and

the

Remote

Keyboard state.

Communication is

established

in

the

Telecommunications

command

state.

FC500

usesthese

commands to

accomplish

its functions.

One of the commands

is to

enter

the

Remote

Keyboard

state.

The

Remote Keyboard state

allows the

keyboard

of the computer/terminal

to

act like

the

CR1OKD

keyboard.

Various

datalogger

modes

may

be entered, including

the

mode in

which

programs

may

be keyed in to the CR500

28

from

the computer/terminal. Entering

the

remote keyboard

state is described in

Section

6.10.

7.2 MEMORY

AND PROGRAMMING

CONCEPTS

'22:1

|NTERNAT.

MEMORY

The

skndard CR500 has

128

K of Flash

Electrically

Erasable

Programmable

Read Only

Mernory

(EEPROM)

and 32 K

Static

Random

Access Memory

(SRAM).

The

Flash EEPROM

stores the

operating.system, user

programs,

and

Final

Storage data.

RAM

is used for

running the

program.'

The use

of the

Input,

Intermediate,

and

Final Storage

in the

measurement

and data

processing

sequence

shown in

Figure 7.2-1.

The fourareas

of

System Memory

-

used

for

overhead

such

as compiling

programs,

transferring

data,

etc. The user cannot access this

memory.

Program Memory

-

available for user

entered

programs.

Input

Storage

-

Input Storage holds the

results

of

measurements

or calculations.

The

*6

Mode

is used to view

Input Storage

locations

for checking

current

sensor

readings

or calculated

values. lnput

Storage

defaults

to 28locations. Add

locations can be assigned

using

the

*A

Mode.

Intermediate Storage

-

Certain

lnstructions

and

most of the

Output

Processing lnstructions

maintain

intermediate results in Intermediate

Storage. lntermediate storage is

automatically accessed by

the

instructions

and

cannot

be accessed

bythe

user. The

default allocation

is

64

locations.

The

number of locations can be changed using

.

the

*A.Mode.

While the

totalsize

of

Program

Memory,

Input

Storage,

and

Intermediate Storage remains

constant, memory may be reallocated between

the areas to accommodate ditferent

rneasurement

and

processing

needs

(*A

Section 7.5.1).

are:

1.

2.

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