Campbell 21X Manual do Operador descarregar pdf (Página 60)

SECTION

6. 9 PIN

SERIAL INPUT/OUTPUT

6.2 ENABLING

PERIPHERALS

Several

peripherals

may be connected

parallel

the 9-pin

port.

The 21X

directs data

to a

particular peripheral

by raising the voltage

specific

dedicated

to the

peripheral;

the

peripheral

enabled

when

the

goes

high.

Three

pins

are dedicated.to

specific

devices,

Tape

Enable

8, Modem

Enable

5, and

Enable

Tape

Enable

(TE),

8, is raised

to 12 volts

power

the

tape recorder.

The SC92A

or SC93A

Cassette lnterface

regulates

the 12 volts

to 6

volts

power

the RC35 recorder.

Only

one

tape inbrtace and

recorder may

be connected

to the 21X.

Modem

Enable

(ME), pin

raised

to enable

a modem that has raised

the

ring

line.

Only one

modem/terminal

may

be connected to

the 21X.

Print Enable

(PE), pin

6, is raised to

enable a

Storage Module

or other

print peripheral.

peripherals

are

defined as

peripherals

which

have

an asynchronous

serial

communications

pod

used to RECEIVE

data transferred by

the

21X.

In most cases

the

peripheral

is a

printer,

but

could also be an

on-line

computer

other

device. lt

possible

to have

than one

peripheral

connected

the 21X

at one

time,

as long

they don't load down

the

TXD

line

(e.9.,

two

Storage Modules,

Section 4.4.1);

allconnected receive

the same data.

6.3 INTERRUPTING

DATA

TRANSFER

STORAGE PERIPHERALS

lnstruction

96 is

used for on-line data

transfer to

peripherals

(Section

4.1).

Data

transfer

aborted when a modem

raises the Ring line

and

the 21X

then

enters Telecommunications

(Section

6.4).

After the 21X exits

Telecommunications,

data transfer to the

peripheral

is resumed

the next time lnstruction

96 is

executed, or, if

activated

the

Mode,

the completion

of the next active table.

The

and

Modes

are used to

position

the

Memory

Pointers,

and to manually initiate

data

transfer from Final

Storage

peripheral.

the #

key is

pressed

during data transfer,

the

transfer

is stopped

and the display

shows the

Final

Storage

location

where the

pointer

stopped.

6-2

Data

transfer

can

be stopped as follows:

Printable ASCII

after

every

output

array.

Binary

after every Final

Storage location.

Tape

after every

block

(512

Final Storage

locations).

6.4

TELECOMMUNICATIONS

MODEM

PERIPHERALS

Any

serialcommunication

device

which raises

the Ring

line

and holds it

high

untilthe ME

line

raised is a modem. The

DC112

phone

modem,

RF95 RF modem, MD9

Multi-Drop

Interface,

and the SC32A RS232 inter{ace used with

computers or terminals

are

modems.

When

modem raises

the Ring

line,

the 21X

responds by raising

the ME

line.

The 21X must

be sent carriage

returns

until

sets the baud

rate.

When

the

baud

rate

set,

the

21X

sends

a carriage

return, line

feed,

The

ME line

is held

high

untilthe

21X receives

an E to exit telecommunications.

The

ME is

also lowered if a character is not received

after

seconds

the

Telecommunications

Command State or

147

seconds

the Remote

Keyboard State. The

colon

in 21X display is

shown while the 21X is in

telecommunications.

Some

modems

are

quite

noisy

when not

it is

possible

for valid

characters to appear in

noise

pattern.

For

this reason, the 21X counts

allthe invalid characters it receives from the

time it answers

a ring

and terminates

communication

(lowers

the

ME line and returns

the "0 Mode)

after receiving 150 invalid

characters.

6.5 INTERFACING WITH

COMPUTERS,

TERMINALS,

AND PRINTERS

This

section

deals with

some

of the basics

serialcommunication

between

the 21X

and

common

computer equipment.

you

have an

IBM

compatible

PC,

the PC208 Datalogger

Support Software takes care of the software

protocol

required

communicating

with

the

21X.

This

section

does not discuss

modem

interfaces other

than the SC32A.

Please

refer

the PC208

and modem

operator's manuals

for interfacing

details on other

modems.

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