Anadex DP-9000 - Page 53

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DEL

-

ASCII

Code

127

-

This

code

is

recognized

as

a

printable

character,

and

the

printer

will

print

an

inverted

question

mark,

i.

e.,

G.

3.3.3

PROTOCOLS:

Four

serial

communications

link

protocol

modes

are

available:

No

Protocol,

X-ON/X-OFF,

STX/ETX,

or

STX/ETX/LRCC.

In

all

cases,

the

data

input

port

is

open

to

receive

data;

but

when

the

communications

mode

is

set

to

OFF

(COMM

OFF),

the

only

data

acted

upon

is

the

code

to

set

the

communications

mode

to

ON

(CO~1

ON).

When

in

the

No

Protocol

status,

then

the

mode

is

always

COMM

ON.

Protocols

are

selected

by

positioning

switches

S2-5

and

S2-6

in

proper

com-

bination

for

the

desired

protocol.

Protocols

are

only

used

in

serial

interface;

therefore,

in

parallel

interface,

the

protocol

select

switches

are

ignored.

X-ON/X-OFF

-

Current

Versions:

(All

printers

labeled

on

the

back

panel

with

PROG

2

or

later.)

This

protocol

emulates

the

DEC

NET

protocol.

DCl (X-ON)

and

DC3

(X-OFF)

when

received

by

the

printer

are

ignored.

DCl

is

transmitted

by

the

printer

on

the

DATA

OUT

line

(pin

2)

at

the

end

of

a

POWER-ON

Initializa-

tion

and

each

time

the

BUFFER

EMPTY

signal

goes

to

the

READY

state

(Not

Busy).

Each

time

the

BUFFER

EMPTY

signal

goes

to

the

BUSY

state

the

printer

transmits

a

DC3

code.

Each

time

a

code

is

to

be

transmitted

by

the

printer

the

RTS

line

goes

to

the

SPACE

Level

and

looks

for

a

CTS

SPACE

level

in

return.

-

Early

Versions:

With

this

protocol

selected,

the

printer

begins

in

the

X-OFF

status.

In

this

status,

the

data

port

is

open

and

data,

is

read

but

discarded

until

receipt

on

an

X-ON

code.

After

the

X-ON

code

is

received,

all

data

is

acted

upon

exactly

as

though

No

Protocol

was

in

effect

until

receipt

of

an

X-OFF

code.

Any

extraneous

X-ON

codes

received

during

X-ON

status

are

ignored.'

When

the

X-OFF

code

is

received,

the

printer

reverts

to

COMM

OFF

status.

Any

unterminated

data

line

(open

printing

record)

is

cancelled.

/

Should

an

X-OFF

code

be

received

during

an

incom-

plete

ESC

sequence,

the

sequence

is

can-

celled.

Control

code

DCl

(ASCII

17)

is

assigned

as

X-ON

and

control

code

DC3

(ASCII

19)

is

assigned

as

X-OFF.

3-15

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