Campbell 21X Manuale dell'Operatore Scaricare il pdf (Pagina 59)

SECTION

6. 9

PIN SERIAL

INPUT/OUTPUT

i

I

6.1 PIN

DESCRIPTION

All external

dommunication

peripherals

connect

to the

21X

through

the

9-pin

serial

l/O connector

(Figure

6.1-11).

Table 6.1-1

gives

a

brief

description

of

each

pin's

function.

srRtAt | /o

\_./Lt\r/\L,/t

4

3l

OCCCC

COCC

FIGURE 6.1-1.

9 Pin Connector

TABLE 6.1-1.

Pin Description

=

Abbreviation

for

the

function

name.

=

Pin number.

=

Signal

Out

of the 21X to a

peripheral.

=

Signal

Into

the

21X

from a

peripheral.

PIN ABR UO

6PEO

Description

5V:

Sources

5V

DC,

used

to

power

peripherals.

Ground:

Provides a

power

return

for

pin

1

(5V),

and

is

used

as a

reference

for

voltage

levels.

Ring:

When

raised

by a

peripheral

the

21X

enters

telecommunications.

Receive

Data:

Serial

data

transmitted

by a

peripheral

are

received

on

pin

4.

Modem

Enable:

Raised by

the 21X

after

the ring line

has

been

raised.

Description

Printer Enable:

Raised to

enable Storage

Module or

other

print

device.

Ground, common

with

pin

2.

Tape Enable:

Powers

the

cassette

recorder

during

data transfer

to

tape.

Transmit Data: Serial data

are transmitted

from

the

21X to

peripherals

on

pin

9;

logic low

marking

(0V)

logic

high spacing

(5V)

standard

asynchronous

ASCll,

8

data

bits,

no

parity,

1 start

bit,

1 stop

bit, 300,

1200,

9600,

76,800

baud

(user

selectable).

6

9

ABR

PIN

o

I

PIN

ABR

UO

15VO

o

RrNq

I

RXD

I

ME

TXD

O

4

6-1

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 190 191

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