Lear Siegler ADM 3A - 3.6 Programming Considerations; 3.7 Gated Extension Port Operation

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__

LEAR SIEGLER, INC.

DATA PRODUCTS DIVISION

ETX 03 or

EOT

04

or

CR

OD.

RTS

line

is

set

high

when

DCD

(carrier

detect)

line

falls,

indicating

that

(character)

transmission

is

complete.

Data

transmission

from

the

ADM

3A

takes

place

when

CTS

l[clear

to

send)

line

from

the

host

is

set

high.

When,

RTS

(and

CTS

from

the

host)

are

reset

to

the

marking

state,

the

ADM

3A

transmission

is

inhibited.

The

terminal

will

not

recognize

any

further

commands

or

codes for

approximately

250

milliseconds

to

allow

the

host

time

to

propagate

its

signal.

3.6 IPROGRAMMING

CONSIDERATIONS

3.6.11

Remote CTRL Operation

The

host

computer

has

full control over

the

ADM

3A.

All

control

operations

which

are

possiblefrom

the

kleyboard

can

a180

be executed from

the

computer

by

transmitting

the

appropriate

CTRL

codes. (Refer to

the

control

and

operators

codes

chart

in

Appendix

A.)

Displayable

characters

will

be'

displayed,

and

valid

control codes will be

recognized

and

acted

upon

in

the

same

manner

described for

keyboard

operations.

3.6.2 Remote Load-Cursor Operation

The

co:mputer

may

command

the

ADM

3A

cursor

to

any

absolute

screen

position,

as

shown

in

the

a:lbsolute

cursor

positions

chart

in

Appendix

A.

3.6.3 Escape Sequences

I~ach

escape

sequence

controls

a specific

terminal

o,peration.

The

escape

sequences

recognized

by

the

,ADM

3A

is

described

in

Table

3-5,

page

3-12.

3.7 GATED EXTENSION PORT

OPERATION

1'he

RS-232C

extension

port

provides

a

convenient

Dlethod for

attaching

an

auxiliary

aerial

asynchronous

device

to

the

ADM

3A.

The

device

IIlay be

an

additional

CRT

terminal;

however, a

1I1Ore

common

application

is

for a

hard

copydevice

such

as

a

printer.

The

extension

port

parallels

the

RS·232C

modem

port,

such

that

any

data

sent

to

the

terminal

through

the

modem

port

is

also

p,assed

through

the

extension

port,

unless

the

port

is

disabled

using

the

gating

function.

The

gating

function

allows

the

host

computer

to

turn

the

extension

port

ON

and

OFF,

using

control codes. (Refer

to

the

control

and

operator

codes

chart

in

Appendix

A.) This

function

is

enabled

by

entering

the

set-up

mode

and

setting

the

SO/SI

feature

to

gate

and

exiting

set-up)

pl'essing

I

CTRL

[R1.

The

I

CTRL

lQ]

commands

disa

bles

the

port.

3-13

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