Anadex DP-9000 User Manual

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X-ONjX-OFF

(cont'd)

STX/ETX

STX/ETX/LRCC

-

(These

are

normally

strapped

together

internally

for

automatic

operation).

The

main

FIFO

character

buffer

in

the

printer

is

reduced

from

704

characters

to

640

characters.

,.The

short-receive

FIFO

is

extended

to

128

characters.

The

short

FIFO

goes

busy

when

102

char-

acter

bytes

remain

available.

There-

fore,

in

serial

communications

mode,

whenever

the

printer

goes

busy

(BUFFER

EMPTY

high

on

SRTS

at

MARK

level)

100

or

more

character

bytes

can

still

be

accepted

without

loss

of

data.

- When

this

protocol

is

switch

selected,

the

printer

initializes

in

ETX

status.

The

data

port

remains

open

and

data

is

read

and

discarded

until

an

STX

code

is

received.

When

an

STX

code

is

received,

the

data

is

received

and

transferred

to

the

FIFO

buffer,

but

not

printed.

Any

communications

errors

(parity,

buffer

overrun,

incorrect

number

of

stop

bits,

etc.)

are

noted.

When

the

data

block

is

complete,

as

indicated

by

receipt

of

the

ETX

code,

the

printer

transmits

an

ACK

code

if

no

errors

were

detected.

The

printer

then

waits

for

an

STX

or

EOT

or

CAN

code.

If

the

returning

code

is'

STX

the

printer

proceeds

to

print

the

stored

data

and

simultaneously

accepts

the

next

block

of

data.

If

the

returning

code

is

EOT,

the

preceding

data

block

is

printed,

but

the

printer

remains

in

the

COMM

OFF

mode.

Receipt

of

a

CAN

code

cancels

the

data

block,

and

the

printer

remains

in

the

COM}1

OFF

mode.

In

the

event

an

error

has

been

detected,

the

printer

transmits

a

NAK

code,

the

data

block

is

cancelled,

and

the

printer

reverts

to

the

COMM

OFF

mode.

When

blocking

data

careful

con-

sideration

must

be

given

to

the

installed

FIFO

buffer

size

since

overrunning

the

buffer

can

prevent

the

receipt

of

the

ETX

code

and

lock

up

the

printer.

-

In

this

protocol,

operation

is

identical

as

described

for

STX/ETX,

except

that

beginning

with

the

first

character

follow-

ing

STX,

and

for

each

subsequent

character

in

the

data

block

including

the

ETX

code,

a

Longitudinal

Redundancy

Check

(LRC)

is

3-16

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Anadex DP-9000 Specifications

General

Brand	Anadex
Model	DP-9000
Category	Printer
Language	English